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RRB ALP Machinist CBT-2 (PART-B) |
28.07.2026 SHIFT-I |
75 Q |
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RRB ALP 2nd Stage CBT Question for Machinist trade iti (CEN-01/2025) by railway life.
TOTAL QUESTION–75 CBT-2 PART-B, I.T.I TRADE– Machinist in Mechanical and allied group syllabus railway stage 2 exam.
Q.1 Which of the following best describes the main advantage of using temporary clamps in CNC work-holding?
CNC Work-Holding में Temporary Clamps के उपयोग का मुख्य Advantage क्या है?
A) They provide the strongest possible holding force during machining / ये Machining के दौरान सबसे अधिक Holding Force प्रदान करते हैं
B) They eliminate the need for aligning the workpiece before machining / ये Machining से पहले Workpiece Alignment की आवश्यकता समाप्त कर देते हैं
C) They are permanently attached to the machine table for stability / ये Stability के लिए Machine Table से Permanently Attached होते हैं
D) They allow quick setup changes and reusability for different jobs / ये Quick Setup Changes और अलग-अलग Jobs के लिए Reusability की सुविधा देते हैं
Answer: D) They allow quick setup changes and reusability for different jobs / ये Quick Setup Changes और अलग-अलग Jobs के लिए Reusability की सुविधा देते हैं
Description:
Temporary clamps can be installed and removed quickly, making them useful when work-holding arrangements need to be changed for different machining jobs.
हिंदी में:
Temporary Clamps को जल्दी Install और Remove किया जा सकता है। इसलिए अलग-अलग Machining Jobs के लिए Work-Holding Arrangement को आसानी से बदला जा सकता है और Clamps को दोबारा उपयोग किया जा सकता है।
Q.2 Which of the following best defines "downtime" in manufacturing?
Manufacturing में "Downtime" को सबसे सही तरीके से कैसे Define किया जाता है?
A) A period during which operators take scheduled breaks / वह समय जब Operators Scheduled Break लेते हैं
B) A period during which machines are not in production / वह समय जब Machines Production में नहीं होती हैं
C) A period during which routine maintenance is performed / वह समय जब Routine Maintenance किया जाता है
D) A period during which machines achieve maximum output / वह समय जब Machines Maximum Output देती हैं
Answer: B) A period during which machines are not in production / वह समय जब Machines Production में नहीं होती हैं
Description:
Downtime refers to a period when a machine or production system is not operating and therefore is not producing output.
हिंदी में:
Downtime वह अवधि है जब Machine या Production System Operate नहीं कर रहा होता और Production Output नहीं दे रहा होता।
Q.3 What is the defining characteristic of multi-point cutting tools?
Multi-Point Cutting Tools की मुख्य विशेषता क्या है?
A) Used for end cutting action / End Cutting Action के लिए उपयोग किए जाते हैं
B) Having single cutting edge / इनमें केवल एक Cutting Edge होती है
C) Having more than one cutting edge / इनमें एक से अधिक Cutting Edges होती हैं
D) Used for side cutting action / Side Cutting Action के लिए उपयोग किए जाते हैं
Answer: C) Having more than one cutting edge / इनमें एक से अधिक Cutting Edges होती हैं
Description:
A multi-point cutting tool has more than one cutting edge, allowing multiple edges to participate in the cutting operation.
हिंदी में:
Multi-Point Cutting Tool में एक से अधिक Cutting Edges होती हैं। Machining के दौरान ये Multiple Cutting Edges Cutting Operation में भाग लेती हैं।
Q.4 Which statement about the distance from the center in a spiral compared to that in a helix is true?
Spiral की Center से Distance और Helix की Distance के बारे में कौन-सा Statement सही है?
A) Helix's radius shrinks inward / Helix की Radius अंदर की ओर कम होती जाती है
B) Spiral's radius changes, helix's radius stays same / Spiral की Radius बदलती है, जबकि Helix की Radius समान रहती है
C) Both have constant radii / दोनों की Radius Constant होती है
D) Both radii increase / दोनों की Radius बढ़ती है
Answer: B) Spiral's radius changes, helix's radius stays same / Spiral की Radius बदलती है, जबकि Helix की Radius समान रहती है
Description:
In a spiral, the distance from the center changes as the curve moves outward or inward. In a helix, the curve wraps around a cylinder with a constant radius.
हिंदी में:
Spiral में Center से Distance आगे बढ़ने के साथ बदलती रहती है। इसके विपरीत Helix एक Cylinder के चारों ओर Constant Radius पर घूमती है, इसलिए इसकी Radius समान रहती है।
Q.5 Dark lines are observed on the surface of a ground workpiece after finishing. What is the most likely cause of these burn marks during the grinding operation?
Finishing के बाद Ground Workpiece की Surface पर Dark Lines दिखाई देती हैं। Grinding Operation के दौरान इन Burn Marks का सबसे संभावित कारण क्या है?
A) Wheel is too hard for the material / Material के लिए Grinding Wheel बहुत Hard है
B) Wheel speed is too slow / Wheel Speed बहुत Slow है
C) Sufficient coolant flow / पर्याप्त Coolant Flow
D) Wheel is too soft for the material / Material के लिए Grinding Wheel बहुत Soft है
Answer: A) Wheel is too hard for the material / Material के लिए Grinding Wheel बहुत Hard है
Description:
A grinding wheel that is too hard may not release worn abrasive grains properly. This can increase friction and heat generation, producing burn marks on the workpiece surface.
हिंदी में:
यदि Grinding Wheel Material की तुलना में बहुत Hard है, तो Worn Abrasive Grains उचित रूप से Release नहीं होते। इससे Friction और Heat Generation बढ़ सकती है, जिसके कारण Workpiece की Surface पर Burn Marks बन सकते हैं।
Q.6 A file is not removing material efficiently. What is the likely cause?
File Material को Efficiently Remove नहीं कर रही है। इसका सबसे संभावित कारण क्या है?
A) File is painted / File पर Paint किया गया है
B) File is too light weight / File का Weight बहुत कम है
C) Handle is too long / Handle बहुत लंबा है
D) Teeth are clogged with debris / File के Teeth Debris से Clogged हैं
Answer: D) Teeth are clogged with debris / File के Teeth Debris से Clogged हैं
Description:
When the teeth of a file become clogged with chips or debris, the cutting edges cannot effectively engage the workpiece, reducing material removal efficiency.
हिंदी में:
जब File के Teeth Chips या Debris से Clogged हो जाते हैं, तो Cutting Edges Workpiece को ठीक से Cut नहीं कर पातीं। इससे Material Removal की Efficiency कम हो जाती है।
Q.7 Which protective equipment is essential during a system failure response?
System Failure Response के दौरान कौन-सा Protective Equipment आवश्यक है?
A) Regular cotton gloves / Regular Cotton Gloves
B) Workshop caps / Workshop Caps
C) Insulated gloves / Insulated Gloves
D) Aprons / Aprons
Answer: C) Insulated gloves / Insulated Gloves
Description:
Insulated gloves provide electrical protection and help reduce the risk of electric shock when responding to a system failure involving electrical equipment.
हिंदी में:
Insulated Gloves Electrical Protection प्रदान करते हैं और Electrical Equipment से संबंधित System Failure के दौरान Electric Shock के Risk को कम करने में सहायता करते हैं।
Q.8 Which of the following statements best describes the vertical milling attachment?
Vertical Milling Attachment का सबसे सही Description क्या है?
A) It offers automatic indexing operation / यह Automatic Indexing Operation प्रदान करता है
B) It converts horizontal to vertical spindle orientation / यह Horizontal Spindle को Vertical Spindle Orientation में बदलता है
C) It provides rotary table movement / यह Rotary Table Movement प्रदान करता है
D) It enables gear cutting on horizontal machines / यह Horizontal Machines पर Gear Cutting की सुविधा देता है
Answer: B) It converts horizontal to vertical spindle orientation / यह Horizontal Spindle को Vertical Spindle Orientation में बदलता है
Description:
A vertical milling attachment allows a horizontal milling machine to perform operations with the spindle positioned vertically.
हिंदी में:
Vertical Milling Attachment, Horizontal Milling Machine के Spindle को Vertical Orientation में कार्य करने की सुविधा देता है। इससे Vertical Milling Operations किए जा सकते हैं।
Q.9 Given the ratio 3:4::6:8, which operation verifies the proportion?
3:4::6:8 दिए गए Ratio में कौन-सा Operation Proportion को Verify करता है?
A) 3 × 8 = 6 × 4 / 3 × 8 = 6 × 4
B) 3 − 4 = 6 − 8 / 3 − 4 = 6 − 8
C) 3 + 8 = 6 + 4 / 3 + 8 = 6 + 4
D) 3/8 = 6/4 / 3/8 = 6/4
Answer: A) 3 × 8 = 6 × 4 / 3 × 8 = 6 × 4
Description:
A proportion a:b::c:d is verified using cross multiplication: a×d=b×c. Here, 3 × 8 = 4 × 6 = 24.
हिंदी में:
Proportion a:b::c:d को Cross Multiplication से Verify किया जाता है: a×d=b×c। यहाँ 3 × 8 = 4 × 6 = 24 है, इसलिए Proportion सही है।
Q.10 If you replaced a left-hand helix with a right-hand helix in a reversing motion device, what problem might occur?
Reversing Motion Device में Left-Hand Helix को Right-Hand Helix से Replace करने पर कौन-सी समस्या हो सकती है?
A) Thread may loosen / Thread ढीला हो सकता है
B) Thread binds more / Thread अधिक Bind हो सकता है
C) Thread stays tight / Thread Tight रहता है
D) Thread changes pitch / Thread की Pitch बदल जाती है
Answer: A) Thread may loosen / Thread ढीला हो सकता है
Description:
A reversing motion device may require a specific helix direction to maintain secure engagement. Replacing a left-hand helix with a right-hand helix can cause the thread to loosen during operation.
हिंदी में:
Reversing Motion Device में Secure Engagement बनाए रखने के लिए विशेष Helix Direction की आवश्यकता हो सकती है। Left-Hand Helix को Right-Hand Helix से बदलने पर Operation के दौरान Thread ढीला हो सकता है।
Q.11 What is the formula used to calculate the hourly depreciation of a machine?
Machine की Hourly Depreciation Calculate करने के लिए कौन-सा Formula उपयोग किया जाता है?
A) (Cost of Machine + Scrap Value) ÷ Total Machine Working Hours / (Machine Cost + Scrap Value) ÷ Total Machine Working Hours
B) (Cost of Machine − Replacement Cost) ÷ Total Machine Working Hours / (Machine Cost − Replacement Cost) ÷ Total Machine Working Hours
C) (Cost of Machine + Scrap Value) × Total Machine Working Hours / (Machine Cost + Scrap Value) × Total Machine Working Hours
D) (Cost of Machine − Scrap Value) ÷ Total Machine Working Hours / (Machine Cost − Scrap Value) ÷ Total Machine Working Hours
Answer: D) (Cost of Machine − Scrap Value) ÷ Total Machine Working Hours / (Machine Cost − Scrap Value) ÷ Total Machine Working Hours
Description:
Hourly depreciation is calculated by subtracting the scrap value from the original machine cost and dividing the depreciable amount by the total expected working hours.
हिंदी में:
Hourly Depreciation निकालने के लिए Machine की Original Cost में से Scrap Value घटाई जाती है। इसके बाद प्राप्त Depreciable Amount को Total Expected Working Hours से Divide किया जाता है।
Q.12 In a three-wire method of thread measurement, wires are selected based on the thread pitch. What may result from using wires larger than the calculated size?
Thread Measurement की Three-Wire Method में Calculated Size से बड़े Wires उपयोग करने पर क्या परिणाम हो सकता है?
A) The wires will provide a tighter fit and better results / Wires अधिक Tight Fit और बेहतर Results देंगे
B) The wires will not fit properly, leading to inaccurate measurement / Wires Properly Fit नहीं होंगे, जिससे Measurement Inaccurate हो जाएगा
C) The wires will measure the root diameter instead of the pitch diameter / Wires Pitch Diameter के बजाय Root Diameter Measure करेंगे
D) The measurement will be more accurate due to increased contact area / Increased Contact Area के कारण Measurement अधिक Accurate होगा
Answer: B) The wires will not fit properly, leading to inaccurate measurement / Wires Properly Fit नहीं होंगे, जिससे Measurement Inaccurate हो जाएगा
Description:
In the three-wire method, wires must be selected according to the thread pitch and calculated size. Using oversized wires can prevent proper seating in the thread grooves and result in inaccurate measurement.
हिंदी में:
Three-Wire Method में Wires का Size Thread Pitch और Calculated Size के अनुसार होना चाहिए। यदि बहुत बड़े Wires उपयोग किए जाएँ, तो वे Thread Grooves में सही तरह Seat नहीं होंगे और Measurement Inaccurate हो सकता है।
Q.13 What is the primary purpose of entering workpiece offset data in the CNC VMC console during setup?
CNC VMC Setup के दौरान Workpiece Offset Data Enter करने का मुख्य उद्देश्य क्या है?
A) To adjust the spindle speed for the operation of the machining process / Machining Process के लिए Spindle Speed Adjust करना
B) To calibrate the coolant flow rate during machining process / Machining के दौरान Coolant Flow Rate Calibrate करना
C) To set the tool length value for the current tool for machining process / Current Tool की Tool Length Value Set करना
D) To define the position of the workpiece origin for machining process / Machining Process के लिए Workpiece Origin की Position Define करना
Answer: D) To define the position of the workpiece origin for machining process / Machining Process के लिए Workpiece Origin की Position Define करना
Description:
Workpiece offset data tells the CNC control where the programmed workpiece coordinate origin is located relative to the machine coordinate system.
हिंदी में:
Workpiece Offset Data CNC Control को यह बताता है कि Programmed Workpiece Coordinate Origin, Machine Coordinate System के सापेक्ष कहाँ स्थित है। इससे CNC Machine सही Reference से Machining करती है।
Q.14 During the setup of a CNC lathe for a first part check, the machinist is instructed to use the single-block mode. What is the primary reason for activating single-block mode at this stage?
First Part Check के दौरान CNC Lathe में Single-Block Mode का मुख्य उद्देश्य क्या है?
A) To optimize spindle speed automatically / Spindle Speed को Automatically Optimize करना
B) To monitor the machine motion for vibrations only / केवल Machine Motion की Vibrations को Monitor करना
C) To verify each program block individually for errors / प्रत्येक Program Block को अलग-अलग Verify करके Errors Check करना
D) To check the coolant flow rate during operation / Operation के दौरान Coolant Flow Rate Check करना
Answer: C) To verify each program block individually for errors / प्रत्येक Program Block को अलग-अलग Verify करके Errors Check करना
Description:
Single-block mode executes one CNC program block at a time, allowing the machinist to check tool movement, coordinates, and programmed operations safely during the first part check.
हिंदी में:
Single-Block Mode में CNC Program का एक Block एक समय में Execute होता है। इससे Machinist First Part Check के दौरान Tool Movement, Coordinates और Programmed Operations को अलग-अलग Verify कर सकता है।
Q.15 Why is centre punching necessary on curved or cylindrical surfaces?
Curved या Cylindrical Surfaces पर Centre Punching क्यों आवश्यक है?
A) Drill bit tends to slip more easily on curved surfaces / Curved Surfaces पर Drill Bit आसानी से Slip कर सकती है
B) Curved surfaces always soften metal layers / Curved Surfaces हमेशा Metal Layers को Soft करती हैं
C) Curved surfaces increase drilling speed automatically / Curved Surfaces Drilling Speed को Automatically बढ़ाती हैं
D) Curved surfaces reduce hardness of metals / Curved Surfaces Metals की Hardness कम करती हैं
Answer: A) Drill bit tends to slip more easily on curved surfaces / Curved Surfaces पर Drill Bit आसानी से Slip कर सकती है
Description:
Centre punching creates a small indentation that provides a starting point for the drill and helps prevent the drill bit from wandering or slipping on a curved surface.
हिंदी में:
Centre Punching से Surface पर एक छोटा Indentation बनता है, जो Drill Bit के लिए Starting Point प्रदान करता है। इससे Curved Surface पर Drill Bit के Slip या Wander करने की संभावना कम होती है।
Q.16 In a cylindrical grinding operation, an operator needs to remove material from the entire surface of a short, stepped workpiece in a single pass. Which method should be selected for efficient operation?
Cylindrical Grinding में Short, Stepped Workpiece की पूरी Surface से एक Single Pass में Material Remove करने के लिए कौन-सी Method चुननी चाहिए?
A) Plunge grinding with stationary table / Stationary Table के साथ Plunge Grinding
B) Traverse grinding with reciprocating table / Reciprocating Table के साथ Traverse Grinding
C) Creep feed grinding for cylindrical surfaces / Cylindrical Surfaces के लिए Creep Feed Grinding
D) Centerless grinding for long parts / Long Parts के लिए Centerless Grinding
Answer: A) Plunge grinding with stationary table / Stationary Table के साथ Plunge Grinding
Description:
Plunge grinding is suitable for short workpieces because the grinding wheel is fed directly into the workpiece without requiring longitudinal table movement, allowing the required surface to be ground efficiently in a single pass.
हिंदी में:
Short Workpieces के लिए Plunge Grinding उपयुक्त है क्योंकि Grinding Wheel को Workpiece में सीधे Feed किया जाता है और Longitudinal Table Movement की आवश्यकता नहीं होती। इससे आवश्यक Surface को Single Pass में Efficiently Grind किया जा सकता है।
Q.17 A CNC machine is programmed to move the tool from point X (10, 20) to point Y (50, 60) using linear interpolation. What will be the nature of the tool path between these two points?
CNC Machine में Tool को Point X (10, 20) से Point Y (50, 60) तक Linear Interpolation द्वारा Move कराया जाता है। इन दोनों Points के बीच Tool Path कैसा होगा?
A) The tool will move in a straight-line path connecting point X and point Y / Tool Point X और Point Y को जोड़ने वाले Straight-Line Path में Move करेगा
B) The tool will move in an arc trajectory from point X to point Y / Tool Point X से Point Y तक Arc Trajectory में Move करेगा
C) The tool will move step-by-step, first along the X-axis and then along the Y-axis / Tool पहले X-Axis और फिर Y-Axis पर Step-by-Step Move करेगा
D) The tool will follow a curved path between the two points / Tool दोनों Points के बीच Curved Path Follow करेगा
Answer: A) The tool will move in a straight-line path connecting point X and point Y / Tool Point X और Point Y को जोड़ने वाले Straight-Line Path में Move करेगा
Description:
In linear interpolation, the CNC controller coordinates the movement of multiple axes simultaneously so that the tool travels along a straight line between the programmed points.
हिंदी में:
Linear Interpolation में CNC Controller Multiple Axes की Movement को एक साथ Coordinate करता है, जिससे Tool Programmed Points के बीच Straight-Line Path में चलता है।
Q.18 What is generally done after drawing the two strokes of an arrowhead?
Arrowhead के दो Strokes Draw करने के बाद सामान्यतः क्या किया जाता है?
A) The enclosed space is shaded with random marks / Enclosed Space को Random Marks से Shade किया जाता है
B) The enclosed space is removed by erasing lines / Enclosed Space को Lines Erase करके हटा दिया जाता है
C) The enclosed space is left completely empty / Enclosed Space को पूरी तरह Empty छोड़ दिया जाता है
D) The enclosed space is neatly filled and darkened / Enclosed Space को साफ-सुथरे तरीके से Fill और Dark किया जाता है
Answer: D) The enclosed space is neatly filled and darkened / Enclosed Space को साफ-सुथरे तरीके से Fill और Dark किया जाता है
Description:
After drawing the two strokes that form an arrowhead, the enclosed area is normally filled and darkened neatly to make the arrowhead clear and easily visible.
हिंदी में:
Arrowhead के दोनों Strokes बनाने के बाद उनके बीच के Enclosed Area को साफ-सुथरे तरीके से Fill और Dark किया जाता है, जिससे Arrowhead स्पष्ट दिखाई दे।
Q.19 The pilot diameter in a piloted counterbore is designed to match which feature?
Piloted Counterbore में Pilot Diameter किस Feature के साथ Match करने के लिए Designed होता है?
A) The length of the counterbore / Counterbore की Length
B) The diameter of the fastener head / Fastener Head का Diameter
C) The shank diameter / Shank का Diameter
D) The diameter of the existing hole / Existing Hole का Diameter
Answer: D) The diameter of the existing hole / Existing Hole का Diameter
Description:
The pilot of a piloted counterbore fits into the existing drilled hole. It guides and centers the counterbore during the cutting operation.
हिंदी में:
Piloted Counterbore का Pilot पहले से बने Existing Hole में Fit होता है। यह Cutting Operation के दौरान Counterbore को सही Center और Guide प्रदान करता है।
Q.20 While setting up a CNC lathe for a new job, it is observed that the tool tip does not align with the programmed workpiece zero point after changing to a longer tool. Which parameter should be adjusted in the machine controller to ensure accurate machining dimensions?
CNC Lathe में New Job Setup के दौरान Longer Tool लगाने के बाद Tool Tip, Programmed Workpiece Zero Point के साथ Align नहीं करता। Accurate Machining Dimensions के लिए Machine Controller में कौन-सा Parameter Adjust करना चाहिए?
A) Feed rate adjustment / Feed Rate Adjustment
B) Spindle speed setting / Spindle Speed Setting
C) Tool length offset value / Tool Length Offset Value
D) Coolant flow rate / Coolant Flow Rate
Answer: C) Tool length offset value / Tool Length Offset Value
Description:
Tool length offset compensates for differences in tool dimensions. When a longer or shorter tool is installed, the corresponding offset must be set correctly so that the tool tip reaches the programmed position accurately.
हिंदी में:
Tool Length Offset अलग-अलग Tools की Length में होने वाले Difference को Compensate करता है। Longer या Shorter Tool लगाने पर सही Offset Value Set करने से Tool Tip Programmed Position पर सही तरीके से पहुँचता है और Accurate Machining होती है।
Q.21 If a drawing specifies a fillet weld with unequal leg lengths, what must the welder ensure during fabrication?
यदि Drawing में Unequal Leg Lengths वाला Fillet Weld दिया गया है, तो Fabrication के दौरान Welder को क्या सुनिश्चित करना चाहिए?
A) Produce a finished weld with both legs matching the specified lengths / दोनों Legs को Drawing में दी गई Specified Lengths के अनुसार बनाना
B) Substitute the specified fillet weld with a standard butt joint configuration / Specified Fillet Weld को Standard Butt Joint से Replace करना
C) Disregard the required leg measurements and focus entirely on the weld throat / Required Leg Measurements को Ignore करके केवल Weld Throat पर ध्यान देना
D) Fabricate the weld with equal leg dimensions regardless of drawing guidelines / Drawing Guidelines की परवाह किए बिना दोनों Weld Legs को Equal बनाना
Answer: A) Produce a finished weld with both legs matching the specified lengths / दोनों Legs को Drawing में दी गई Specified Lengths के अनुसार बनाना
Description:
For an unequal-leg fillet weld, each leg must be produced according to the dimensions specified on the engineering drawing to achieve the required weld geometry.
हिंदी में:
Unequal-Leg Fillet Weld में दोनों Weld Legs की Dimensions अलग-अलग हो सकती हैं। Welder को Engineering Drawing में दी गई प्रत्येक Leg की Specified Length के अनुसार Weld बनाना चाहिए।
Q.22 A detailed drawing includes a note: M12 × 1.75. What does the 1.75 specify in screw thread representation?
Detailed Drawing में M12 × 1.75 दिया है। Screw Thread Representation में 1.75 क्या दर्शाता है?
A) The major diameter of the screw thread / Screw Thread का Major Diameter
B) The pitch of the thread in millimeters / Thread की Pitch Millimeters में
C) The total length of the threaded portion / Threaded Portion की Total Length
D) The thread angle measured in degrees / Thread Angle Degrees में
Answer: B) The pitch of the thread in millimeters / Thread की Pitch Millimeters में
Description:
In the designation M12 × 1.75, “M” indicates a metric thread, “12” represents the nominal diameter, and “1.75” represents the thread pitch in millimeters.
हिंदी में:
M12 × 1.75 में M Metric Thread को, 12 mm Nominal Diameter को और 1.75 mm Thread Pitch को दर्शाता है।
Q.23 Which condition would most likely cause uneven lubrication in a splash lubrication system?
Splash Lubrication System में Uneven Lubrication का सबसे संभावित कारण क्या है?
A) Using clean oil in the reservoir for lubrication system / Lubrication System के Reservoir में Clean Oil का उपयोग करना
B) Improper alignment of the oil ring with the oil level / Oil Ring का Oil Level के साथ Improper Alignment
C) Maintaining proper oil viscosity for smooth circulation / Smooth Circulation के लिए Proper Oil Viscosity बनाए रखना
D) Maintaining correct shaft rotation for oil distribution / Oil Distribution के लिए Correct Shaft Rotation बनाए रखना
Answer: B) Improper alignment of the oil ring with the oil level / Oil Ring का Oil Level के साथ Improper Alignment
Description:
In a splash lubrication system, incorrect alignment of the oil ring with the oil level can interfere with proper oil pickup and distribution, resulting in uneven lubrication.
हिंदी में:
Splash Lubrication System में Oil Ring का Oil Level के साथ सही Alignment न होने पर Oil Pickup और Distribution प्रभावित हो सकता है, जिससे Uneven Lubrication हो सकती है।
Q.24 A workshop facing repeated incidents of misplaced hazardous materials should prioritize which advanced housekeeping measure?
Workshop में Hazardous Materials के बार-बार Misplaced होने पर कौन-सा Advanced Housekeeping Measure प्राथमिकता से अपनाना चाहिए?
A) Posting warning notices around designated hazardous storage areas / Designated Hazardous Storage Areas के आसपास Warning Notices लगाना
B) Switching to sealed material containers with safety labeling / Safety Labeling वाले Sealed Material Containers का उपयोग करना
C) Establishing color-coded storage with end-of-shift inspections / Color-Coded Storage और End-of-Shift Inspections लागू करना
D) Providing handling instruction programs for workshop employees / Workshop Employees के लिए Handling Instruction Programs देना
Answer: C) Establishing color-coded storage with end-of-shift inspections / Color-Coded Storage और End-of-Shift Inspections लागू करना
Description:
Color-coded storage provides clear identification and designated locations for hazardous materials, while end-of-shift inspections help verify that materials have been returned to their correct locations.
हिंदी में:
Color-Coded Storage से Hazardous Materials की पहचान और उनकी Designated Location स्पष्ट होती है। End-of-Shift Inspection यह सुनिश्चित करने में मदद करती है कि Materials अपनी सही जगह पर वापस रखे गए हैं।
Q.25 Which measuring method is used to examine the concentric alignment of a chuck mounted on a back plate?
Back Plate पर Mounted Chuck की Concentric Alignment को Check करने के लिए कौन-सी Measuring Method उपयोग की जाती है?
A) Using feeler gauge / Feeler Gauge का उपयोग
B) Using Dial indicator / Dial Indicator का उपयोग
C) Visual inspection by the eyes / आँखों से Visual Inspection
D) Using calipers / Calipers का उपयोग
Answer: B) Using Dial indicator / Dial Indicator का उपयोग
Description:
A dial indicator is used to measure small deviations or runout and is suitable for checking the concentric alignment of a chuck mounted on a back plate.
हिंदी में:
Dial Indicator छोटे Deviations या Runout को Measure करने के लिए उपयोग किया जाता है। इसलिए Back Plate पर Mounted Chuck की Concentric Alignment Check करने के लिए यह उपयुक्त है।
Q.26 Which of the following tasks is NOT suitable for a bench-type drilling machine?
निम्नलिखित में से कौन-सा Task Bench-Type Drilling Machine के लिए Suitable नहीं है?
A) Making holes in thin plastic sheets / Thin Plastic Sheets में Holes बनाना
B) Drilling large diameter holes in heavy beams / Heavy Beams में Large Diameter Holes Drill करना
C) Performing counter-sinking operations on light workpieces / Light Workpieces पर Counter-Sinking Operations करना
D) Drilling small holes in sheet metals / Sheet Metals में Small Holes Drill करना
Answer: B) Drilling large diameter holes in heavy beams / Heavy Beams में Large Diameter Holes Drill करना
Description:
Bench-type drilling machines are designed for relatively small and light workpieces. Large-diameter drilling in heavy beams generally requires a larger, more powerful drilling machine.
हिंदी में:
Bench-Type Drilling Machine सामान्यतः Small और Light Workpieces के लिए उपयोग की जाती है। Heavy Beams में Large-Diameter Holes बनाने के लिए अधिक Powerful और Heavy-Duty Drilling Machine की आवश्यकता होती है।
Q.27 While preparing a hardened plain carbon steel, a machinist must ensure uniform grain structure and relieve internal stresses before hardening. Which sequence of heat treatments should be followed to achieve this?
Hardened Plain Carbon Steel तैयार करते समय Uniform Grain Structure और Internal Stresses को कम करने के लिए Heat Treatment का कौन-सा Sequence Follow करना चाहिए?
A) Direct quenching without prior normalization / Prior Normalization के बिना Direct Quenching
B) Normalizing followed by quenching / Normalizing के बाद Quenching
C) Spheroidizing followed by tempering / Spheroidizing के बाद Tempering
D) Annealing followed by quenching / Annealing के बाद Quenching
Answer: B) Normalizing followed by quenching / Normalizing के बाद Quenching
Description:
Normalizing is used to refine and produce a more uniform grain structure and relieve internal stresses. Quenching is then carried out to obtain the required hardened structure.
हिंदी में:
Normalizing से Grain Structure को Refine और Uniform किया जाता है तथा Internal Stresses को कम किया जाता है। इसके बाद Required Hardened Structure प्राप्त करने के लिए Quenching की जाती है।
Q.28 Which of the following best describes the main difference between annealing and normalizing in heat treatment?
Heat Treatment में Annealing और Normalizing के बीच मुख्य अंतर क्या है?
A) Annealing hardens mild steel, while normalizing softens stainless steel / Annealing Mild Steel को Harden करता है, जबकि Normalizing Stainless Steel को Soft करता है
B) Annealing cools metals slowly in furnace, while normalizing cools metals in air / Annealing में Metal को Furnace में धीरे-धीरे Cool किया जाता है, जबकि Normalizing में Air में Cool किया जाता है
C) Annealing uses water quenching, while normalizing uses oil quenching / Annealing में Water Quenching और Normalizing में Oil Quenching की जाती है
D) Annealing is used after welding, while normalizing is used before welding / Annealing Welding के बाद और Normalizing Welding से पहले उपयोग किया जाता है
Answer: B) Annealing cools metals slowly in furnace, while normalizing cools metals in air / Annealing में Metal को Furnace में धीरे-धीरे Cool किया जाता है, जबकि Normalizing में Air में Cool किया जाता है
Description:
The main difference is the cooling method. In annealing, the heated material is cooled slowly inside the furnace, while in normalizing it is removed from the furnace and allowed to cool in air.
हिंदी में:
मुख्य अंतर Cooling Method का है। Annealing में Heated Material को Furnace के अंदर धीरे-धीरे Cool किया जाता है, जबकि Normalizing में Material को Furnace से निकालकर Air में Cool किया जाता है।
Q.29 Which of the following tool angles affects chip flow during turning operations?
Turning Operation के दौरान Chip Flow को कौन-सा Tool Angle प्रभावित करता है?
A) Clearance angle / Clearance Angle
B) Relief angle / Relief Angle
C) Point angle / Point Angle
D) Rake angle / Rake Angle
Answer: D) Rake angle / Rake Angle
Description:
The rake angle directly influences the direction and ease of chip flow over the cutting tool during a turning operation.
हिंदी में:
Rake Angle Turning Operation के दौरान Cutting Tool के ऊपर Chip के Flow की Direction और Ease को सीधे प्रभावित करता है।
Q.30 Which operation most benefits from using a V-block with a clamp?
Clamp के साथ V-Block का उपयोग किस Operation में सबसे अधिक लाभदायक है?
A) Filing flat surfaces / Flat Surfaces की Filing
B) Grinding a rectangular plate / Rectangular Plate की Grinding
C) Drilling a hole through a round bar / Round Bar में Hole Drilling
D) Measuring internal diameter / Internal Diameter की Measurement
Answer: C) Drilling a hole through a round bar / Round Bar में Hole Drilling
Description:
A V-block securely supports and holds cylindrical or round workpieces, making it especially useful for accurately drilling holes through round bars.
हिंदी में:
V-Block Cylindrical या Round Workpieces को Securely Support और Hold करता है। इसलिए Round Bar में Accurate Hole Drilling के लिए इसका उपयोग विशेष रूप से लाभदायक है।
Q.31 A precise gear tooth profile is to be cut on a milling machine. Which milling attachment should be selected to accurately divide the workpiece for this operation?
Milling Machine पर Precise Gear Tooth Profile बनाने के लिए Workpiece को Accurately Divide करने हेतु कौन-सा Milling Attachment उपयोग करना चाहिए?
A) Vertical milling attachment / Vertical Milling Attachment
B) Dividing head attachment / Dividing Head Attachment
C) Slotting attachment / Slotting Attachment
D) Rotary table attachment / Rotary Table Attachment
Answer: B) Dividing head attachment / Dividing Head Attachment
Description:
A dividing head is used to accurately rotate and divide a workpiece into specified angular positions, making it essential for cutting gear teeth accurately.
हिंदी में:
Dividing Head Workpiece को Precisely Rotate और Required Angular Positions में Divide करने के लिए उपयोग किया जाता है। इसलिए Gear Teeth को Accurate तरीके से Cut करने के लिए यह आवश्यक है।
Q.32 What is the main reason for wearing gloves when giving first aid for bleeding?
Bleeding के लिए First Aid देते समय Gloves पहनने का मुख्य कारण क्या है?
A) To help stop the bleeding / Bleeding रोकने में सहायता के लिए
B) To keep hands free from dirt / Hands को Dirt से बचाने के लिए
C) To protect against infection / Infection से बचाव के लिए
D) To make hands feel comfortable / Hands को Comfortable रखने के लिए
Answer: C) To protect against infection / Infection से बचाव के लिए
Description:
Wearing gloves provides a barrier between the first aider and blood, helping reduce the risk of infection and exposure to potentially harmful biological material.
हिंदी में:
Gloves First Aider और Blood के बीच एक Protective Barrier बनाते हैं। इससे Infection तथा संभावित Harmful Biological Material के Exposure का Risk कम होता है।
Q.33 While calculating plate cam motion, which parameter is essential for determining the displacement of the follower at any given cam rotation angle?
Plate Cam Motion की Calculation में किसी भी Cam Rotation Angle पर Follower का Displacement निर्धारित करने के लिए कौन-सा Parameter आवश्यक है?
A) The distance from the camshaft center to the cam profile at a specific angle / Specific Angle पर Camshaft Center से Cam Profile तक की Distance
B) The hardness of the tip of the follower used in the cam mechanism / Cam Mechanism में उपयोग Follower Tip की Hardness
C) The material used to manufacture the plate cam / Plate Cam बनाने में उपयोग Material
D) The spindle rotation on which the cam is attached / वह Spindle Rotation जिस पर Cam Attached है
Answer: A) The distance from the camshaft center to the cam profile at a specific angle / Specific Angle पर Camshaft Center से Cam Profile तक की Distance
Description:
The radial distance from the camshaft center to the cam profile at a given angular position determines the position and displacement of the follower.
हिंदी में:
किसी दिए गए Angular Position पर Camshaft Center से Cam Profile तक की Radial Distance Follower की Position और Displacement निर्धारित करती है।
Q.34 What is the primary function of feedback devices in CNC machines?
CNC Machines में Feedback Devices का Primary Function क्या है?
A) To lubricate moving machine parts at friction points / Moving Machine Parts के Friction Points पर Lubrication करना
B) To store CNC programs as a memory in tape / CNC Programs को Tape में Memory के रूप में Store करना
C) To monitor and report actual position to the control unit / Actual Position को Monitor करके Control Unit को Report करना
D) To supply power to the servo motors for optimum speed / Optimum Speed के लिए Servo Motors को Power Supply करना
Answer: C) To monitor and report actual position to the control unit / Actual Position को Monitor करके Control Unit को Report करना
Description:
Feedback devices such as encoders measure the actual position or movement of machine components and send this information to the CNC control unit for accurate positioning.
हिंदी में:
Encoder जैसे Feedback Devices Machine Components की Actual Position या Movement को Measure करके CNC Control Unit को Information देते हैं। इससे Accurate Positioning सुनिश्चित होती है।
Q.35 As the angle increases beyond 45 degrees, what happens to the tangent value?
Angle के 45° से अधिक बढ़ने पर Tangent Value पर क्या प्रभाव पड़ता है?
A) Tangent value becomes zero / Tangent Value Zero हो जाती है
B) Tangent value remains constant / Tangent Value Constant रहती है
C) Tangent value increases above 1 / Tangent Value 1 से अधिक हो जाती है
D) Tangent value decreases below 1 / Tangent Value 1 से कम हो जाती है
Answer: C) Tangent value increases above 1 / Tangent Value 1 से अधिक हो जाती है
Description:
At 45°, the tangent value is 1. As the angle increases beyond 45° toward 90°, the tangent value increases above 1.
हिंदी में:
45° पर Tangent Value 1 होती है। Angle को 45° से अधिक बढ़ाने पर 90° की ओर जाते हुए Tangent Value 1 से अधिक होती जाती है।
Q.36 During installation of a new spindle head on a vertical milling machine, what is the most critical step to ensure reliable operation and long-term accuracy?
Vertical Milling Machine पर New Spindle Head Install करते समय Reliable Operation और Long-Term Accuracy के लिए सबसे महत्वपूर्ण Step क्या है?
A) Tightening all spindle head mounting bolts uniformly / सभी Spindle Head Mounting Bolts को Uniformly Tight करना
B) Aligning the spindle head precisely with the vertical machine axis / Spindle Head को Vertical Machine Axis के साथ Precisely Align करना
C) Adjusting the table longitudinal stops for travel limits / Table Longitudinal Stops को Travel Limits के लिए Adjust करना
D) Lubricating the spindle quill and machine parts after installation / Installation के बाद Spindle Quill और Machine Parts को Lubricate करना
Answer: B) Aligning the spindle head precisely with the vertical machine axis / Spindle Head को Vertical Machine Axis के साथ Precisely Align करना
Description:
Precise alignment of the spindle head with the machine axis is essential for maintaining machining accuracy, proper tool movement, and reliable long-term operation.
हिंदी में:
Spindle Head को Machine Axis के साथ Precisely Align करना Machining Accuracy, सही Tool Movement और Long-Term Reliable Operation के लिए आवश्यक है।
Q.37 When comparing piloted counterbore and countersink tools, which statement is correct?
Piloted Counterbore और Countersink Tools की तुलना में कौन-सा Statement सही है?
A) Piloted counterbores create conical holes, while countersinks create flat-bottomed holes / Piloted Counterbores Conical Holes और Countersinks Flat-Bottomed Holes बनाते हैं
B) Piloted counterbores create flat-bottomed holes, while countersinks create conical holes / Piloted Counterbores Flat-Bottomed Holes और Countersinks Conical Holes बनाते हैं
C) Both piloted counterbores and countersinks create tapered holes / दोनों Piloted Counterbores और Countersinks Tapered Holes बनाते हैं
D) Both piloted counterbores and countersinks create only through-holes / दोनों केवल Through-Holes बनाते हैं
Answer: B) Piloted counterbores create flat-bottomed holes, while countersinks create conical holes / Piloted Counterbores Flat-Bottomed Holes और Countersinks Conical Holes बनाते हैं
Description:
A counterbore produces a cylindrical, flat-bottomed recess, while a countersink produces a conical recess, typically for accommodating the head of a fastener.
हिंदी में:
Counterbore एक Cylindrical और Flat-Bottomed Recess बनाता है, जबकि Countersink एक Conical Recess बनाता है, जिसका उपयोग सामान्यतः Fastener Head को बैठाने के लिए किया जाता है।
Q.38 What is one limitation of using the tailstock offset method for taper turning in terms of workpiece setup?
Taper Turning में Tailstock Offset Method की Workpiece Setup के संदर्भ में एक Limitation क्या है?
A) It requires use of rapid feed during the turning operation process / Turning Operation के दौरान Rapid Feed का उपयोग आवश्यक होता है
B) It requires the workpiece to be held strictly between centers / Workpiece को Strictly Between Centers Hold करना आवश्यक होता है
C) It requires use of a special chuck for mounting workpiece / Workpiece Mount करने के लिए Special Chuck आवश्यक होता है
D) It requires swiveling of the compound rest during setup work / Setup के दौरान Compound Rest को Swivel करना आवश्यक होता है
Answer: B) It requires the workpiece to be held strictly between centers / Workpiece को Strictly Between Centers Hold करना आवश्यक होता है
Description:
The tailstock offset method produces taper by offsetting the tailstock and is applicable when the workpiece is supported between centers.
हिंदी में:
Tailstock Offset Method में Taper बनाने के लिए Tailstock को Offset किया जाता है और Workpiece को Centers के बीच Support करना आवश्यक होता है।
Q.39 Why are V-blocks often used in pairs when supporting long cylindrical workpieces?
Long Cylindrical Workpieces को Support करते समय V-Blocks को अक्सर Pair में क्यों उपयोग किया जाता है?
A) To measure thickness of the workpiece / Workpiece की Thickness Measure करने के लिए
B) To provide balanced support and alignment / Balanced Support और Alignment प्रदान करने के लिए
C) To increase cutting speed / Cutting Speed बढ़ाने के लिए
D) To reduce the cost of fixtures / Fixtures की Cost कम करने के लिए
Answer: B) To provide balanced support and alignment / Balanced Support और Alignment प्रदान करने के लिए
Description:
Using two V-blocks provides stable and balanced support along the length of a cylindrical workpiece and helps maintain proper alignment during machining or inspection.
हिंदी में:
दो V-Blocks का उपयोग Cylindrical Workpiece की Length के साथ Stable और Balanced Support देता है तथा Machining या Inspection के दौरान Proper Alignment बनाए रखने में सहायता करता है।
Q.40 Which application is most suitable for a triangular file?
Triangular File के लिए कौन-सा Application सबसे Suitable है?
A) Sharpening saw teeth / Saw Teeth को Sharpen करना
B) Polishing flat surfaces / Flat Surfaces की Polishing
C) Boring holes / Holes की Boring
D) Cutting threads / Threads की Cutting
Answer: A) Sharpening saw teeth / Saw Teeth को Sharpen करना
Description:
A triangular file has three angled faces and is particularly suitable for sharpening the teeth of saws and working on V-shaped grooves.
हिंदी में:
Triangular File की तीन Angled Faces होती हैं और यह विशेष रूप से Saw Teeth को Sharpen करने तथा V-Shaped Grooves पर काम करने के लिए Suitable होती है।
Q.41 Before starting the grinding operation, an operator inspects the wheel for safe operation. Which check is most critical to prevent wheel burst accidents?
Grinding Operation शुरू करने से पहले Wheel की Safety Check में Wheel Burst Accident को रोकने के लिए कौन-सी Check सबसे महत्वपूर्ण है?
A) Ensure the wheel dresser remains sharp and properly cleaned / Wheel Dresser को Sharp और Properly Clean रखना
B) Check the coolant system carefully for leaks around the machine area / Machine Area के आसपास Coolant System में Leaks Check करना
C) Conduct a ring test to check for cracks before mounting the wheel / Wheel Mount करने से पहले Ring Test करके Cracks Check करना
D) Verify the tailstock pressure is set to manufacturer recommendations / Tailstock Pressure को Manufacturer Recommendations के अनुसार Verify करना
Answer: C) Conduct a ring test to check for cracks before mounting the wheel / Wheel Mount करने से पहले Ring Test करके Cracks Check करना
Description:
A ring test is used to help detect cracks in an abrasive grinding wheel before mounting. A damaged wheel can fail catastrophically at high rotational speed.
हिंदी में:
Ring Test Grinding Wheel को Mount करने से पहले उसमें मौजूद संभावित Cracks को Check करने के लिए किया जाता है। Damaged Wheel High Speed पर टूटकर गंभीर Accident का कारण बन सकता है।
Q.42 If the spindle speed is doubled but the wheel diameter remains the same, what happens to the cutting speed in grinding?
यदि Spindle Speed को Double कर दिया जाए और Wheel Diameter समान रहे, तो Grinding में Cutting Speed पर क्या प्रभाव पड़ेगा?
A) The cutting speed will be reduced to half / Cutting Speed आधी हो जाएगी
B) The cutting speed will remain the same / Cutting Speed समान रहेगी
C) The cutting speed will become four times / Cutting Speed चार गुना हो जाएगी
D) The cutting speed will also be doubled / Cutting Speed भी Double हो जाएगी
Answer: D) The cutting speed will also be doubled / Cutting Speed भी Double हो जाएगी
Description:
For a grinding wheel of constant diameter, cutting speed is directly proportional to spindle rotational speed. Therefore, doubling the spindle speed doubles the cutting speed.
हिंदी में:
Constant Wheel Diameter के लिए Cutting Speed, Spindle Speed के Directly Proportional होती है। इसलिए Spindle Speed को Double करने पर Cutting Speed भी Double हो जाती है।
Q.43 A machinist attempts to adjust the vertical height of a table by using saddle in a milling machine. What mistake is being made?
Milling Machine में Saddle का उपयोग करके Table की Vertical Height Adjust करने पर कौन-सी Mistake हो रही है?
A) Saddle does not provide vertical movement / Saddle Vertical Movement प्रदान नहीं करता है
B) Saddle does not support worktable / Saddle Worktable को Support नहीं करता है
C) Saddle is fixed to column / Saddle Column से Fixed होता है
D) Saddle controls spindle speed / Saddle Spindle Speed को Control करता है
Answer: A) Saddle does not provide vertical movement / Saddle Vertical Movement प्रदान नहीं करता है
Description:
The saddle provides movement of the table across the machine, generally in the transverse direction. Vertical height adjustment is performed using the knee.
हिंदी में:
Saddle मुख्यतः Table को Transverse Direction में Move करने के लिए उपयोग होता है। Table की Vertical Height Adjust करने के लिए Knee का उपयोग किया जाता है।
Q.44 During CNC lathe setup, the spindle speed override is set to 50%. What advantage does this provide to the operator?
CNC Lathe Setup के दौरान Spindle Speed Override को 50% पर Set करने से Operator को क्या Advantage मिलता है?
A) It sets the feed rate for roughing operation / यह Roughing Operation के लिए Feed Rate Set करता है
B) It allows safer observation during trial cutting / यह Trial Cutting के दौरान Safer Observation की सुविधा देता है
C) It automatically finishes the part up to final length / यह Part को Automatically Final Length तक Finish करता है
D) It selects the correct tool set for the job / यह Job के लिए Correct Tool Set Select करता है
Answer: B) It allows safer observation during trial cutting / यह Trial Cutting के दौरान Safer Observation की सुविधा देता है
Description:
Reducing the spindle speed to 50% allows the operator to observe the cutting process more safely during trial cutting and identify any abnormal tool movement or machining conditions.
हिंदी में:
Spindle Speed को 50% तक कम करने से Operator Trial Cutting के दौरान Cutting Process को अधिक सुरक्षित तरीके से Observe कर सकता है और किसी भी Abnormal Tool Movement या Machining Condition को पहचान सकता है।
Q.45 In marking operations, a V-block is mainly used to:
Marking Operations में V-Block का मुख्य उपयोग किस लिए किया जाता है?
A) Measure diameter directly / Diameter को Directly Measure करना
B) Mark centers of round bars / Round Bars के Centers Mark करना
C) Measure surface roughness / Surface Roughness Measure करना
D) Support square plates / Square Plates को Support करना
Answer: B) Mark centers of round bars / Round Bars के Centers Mark करना
Description:
A V-block securely supports cylindrical or round workpieces and helps accurately locate and mark their center lines.
हिंदी में:
V-Block Cylindrical या Round Workpieces को Securely Support करता है और उनके Center Lines को Accurately Locate तथा Mark करने में सहायता करता है।
Q.46 Which of the following is a direct benefit of using absolute programming in CNC VMC operations?
CNC VMC Operations में Absolute Programming का Direct Benefit क्या है?
A) Faster spindle speed / Faster Spindle Speed
B) Shorter programs / Shorter Programs
C) Less setup time / Less Setup Time
D) Easier error detection / Easier Error Detection
Answer: D) Easier error detection / Easier Error Detection
Description:
In absolute programming, coordinates are referenced from a fixed workpiece origin. This makes programmed positions easier to understand and helps identify coordinate errors.
हिंदी में:
Absolute Programming में सभी Coordinates एक Fixed Workpiece Origin के Reference से दिए जाते हैं। इससे Programmed Positions को समझना और Coordinate Errors को पहचानना आसान हो जाता है।
Q.47 Why is interchangeability important in mass production according to Bureau of Indian Standards (BIS) guidelines?
Bureau of Indian Standards (BIS) के अनुसार Mass Production में Interchangeability क्यों महत्वपूर्ण है?
A) It guarantees zero defects in every manufactured part / यह प्रत्येक Manufactured Part में Zero Defects की Guarantee देता है
B) It allows replacement of parts without custom adjustments / यह Custom Adjustments के बिना Parts को Replace करने की सुविधा देता है
C) It ensures all parts are made with zero tolerances / यह सुनिश्चित करता है कि सभी Parts Zero Tolerance के साथ बनाए जाएँ
D) It ensures all parts are made from identical materials / यह सुनिश्चित करता है कि सभी Parts Identical Materials से बनाए जाएँ
Answer: B) It allows replacement of parts without custom adjustments / यह Custom Adjustments के बिना Parts को Replace करने की सुविधा देता है
Description:
Interchangeability ensures that components manufactured within specified tolerances can be replaced by equivalent components without requiring individual fitting or modification.
हिंदी में:
Interchangeability यह सुनिश्चित करती है कि Specified Tolerances के अंदर Manufactured Components को बिना Individual Fitting या Custom Modification के Equivalent Components से Replace किया जा सके।
Q.48 Which standard recommends the use of single-stroke lettering in engineering drawings?
Engineering Drawings में Single-Stroke Lettering के उपयोग की Recommendation किस Standard में दी गई है?
A) IS : 1234-1999 / IS : 1234-1999
B) IS : 9609-2001 / IS : 9609-2001
C) BS : 8888-2010 / BS : 8888-2010
D) ISO : 9001-2000 / ISO : 9001-2000
Answer: B) IS : 9609-2001 / IS : 9609-2001
Description:
According to the provided question source, IS 9609-2001 is identified as the standard recommending single-stroke lettering for engineering drawings.
हिंदी में:
दिए गए Question Source के अनुसार, Engineering Drawings में Single-Stroke Lettering के उपयोग के लिए IS 9609-2001 को Recommended Standard बताया गया है।
Q.49 A machine has an original cost of 100,000, scrap value of 10,000, and total working hours of 10,000. What is its hourly depreciation?
एक Machine की Original Cost 100,000, Scrap Value 10,000 और Total Working Hours 10,000 हैं। इसकी Hourly Depreciation कितनी होगी?
A) 10 / 10
B) 12 / 12
C) 11 / 11
D) 9 / 9
Answer: D) 9 / 9
Description:
Hourly depreciation is calculated as:
(Original Cost − Scrap Value) ÷ Total Working Hours
= (100,000 − 10,000) ÷ 10,000
= 90,000 ÷ 10,000
= 9 per hour
हिंदी में:
Hourly Depreciation का Formula है:
(Original Cost − Scrap Value) ÷ Total Working Hours
= (100,000 − 10,000) ÷ 10,000
= 9 प्रति घंटा
Q.50 In piloted counterbore nomenclature, what does the term "body" refer to?
Piloted Counterbore Nomenclature में "Body" शब्द किस भाग को दर्शाता है?
A) The cutting portion that enlarges the hole / Hole को Enlarge करने वाला Cutting Portion
B) The cylindrical guide at the tip / Tip पर स्थित Cylindrical Guide
C) The threaded part for attachment / Attachment के लिए Threaded Part
D) The handle / Handle
Answer: A) The cutting portion that enlarges the hole / Hole को Enlarge करने वाला Cutting Portion
Description:
In a piloted counterbore, the body contains the cutting portion that enlarges the existing hole to the required counterbore diameter, while the pilot guides the tool.
हिंदी में:
Piloted Counterbore में Body वह Cutting Portion होता है जो Existing Hole को Required Counterbore Diameter तक Enlarge करता है, जबकि Pilot Tool को Guide करता है।
Q.51 Which characteristic is NOT commonly linked with ceramic cutting tool materials?
Ceramic Cutting Tool Materials के साथ कौन-सी Characteristic सामान्यतः Linked नहीं होती है?
A) High toughness / High Toughness
B) Heat resistance / Heat Resistance
C) High hardness / High Hardness
D) Wear resistance / Wear Resistance
Answer: A) High toughness / High Toughness
Description:
Ceramic cutting tools are generally known for high hardness, excellent heat resistance, and good wear resistance. However, they are relatively brittle and do not have high toughness.
हिंदी में:
Ceramic Cutting Tools अपनी High Hardness, Excellent Heat Resistance और Good Wear Resistance के लिए जाने जाते हैं। लेकिन ये अपेक्षाकृत Brittle होते हैं और इनमें High Toughness नहीं होती।
Q.52 A machinist needs to slot multiple identical parts quickly. Which machine vice feature best supports efficient, repeatable clamping?
Multiple Identical Parts को जल्दी Slot करने के लिए कौन-सा Machine Vice Feature Efficient और Repeatable Clamping में सबसे अधिक सहायक है?
A) Fixed jaw only / केवल Fixed Jaw
B) Manual alignment indicator / Manual Alignment Indicator
C) Single position locking system / Single Position Locking System
D) Quick-release jaw mechanism / Quick-Release Jaw Mechanism
Answer: D) Quick-release jaw mechanism / Quick-Release Jaw Mechanism
Description:
A quick-release jaw mechanism allows the machinist to open and close the vice rapidly, making repeated clamping and unclamping of identical parts faster and more efficient.
हिंदी में:
Quick-Release Jaw Mechanism से Vice को जल्दी Open और Close किया जा सकता है। इससे Identical Parts को बार-बार Clamp और Unclamp करना तेज और Efficient हो जाता है।
Q.53 When using MPG mode on a CNC lathe, what does rotating the handwheel achieve?
CNC Lathe में MPG Mode का उपयोग करते समय Handwheel को Rotate करने से क्या होता है?
A) Increases spindle speed proportionally to rotation / Rotation के अनुसार Spindle Speed बढ़ती है
B) Selects between different part programs loaded / अलग-अलग Loaded Part Programs को Select करता है
C) Moves the selected machine axis in small increments / Selected Machine Axis को Small Increments में Move करता है
D) Changes tool length offset values in the system / System में Tool Length Offset Values बदलता है
Answer: C) Moves the selected machine axis in small increments / Selected Machine Axis को Small Increments में Move करता है
Description:
In MPG (Manual Pulse Generator) mode, rotating the handwheel generates controlled pulses that move the selected CNC axis by small increments.
हिंदी में:
MPG (Manual Pulse Generator) Mode में Handwheel को Rotate करने पर Controlled Pulses Generate होते हैं, जिससे Selected CNC Axis छोटे-छोटे Increments में Move करती है।
Q.54 What is the main function of an indexing plate in a dividing head setup?
Dividing Head Setup में Indexing Plate का मुख्य Function क्या है?
A) To clamp the workpiece / Workpiece को Clamp करना
B) To control spindle speed / Spindle Speed को Control करना
C) To assist in precise divisions / Precise Divisions में सहायता करना
D) To hold the workpiece / Workpiece को Hold करना
Answer: C) To assist in precise divisions / Precise Divisions में सहायता करना
Description:
The indexing plate provides accurately spaced holes that allow the dividing head spindle to be rotated through precise angular divisions.
हिंदी में:
Indexing Plate में Accurately Spaced Holes होते हैं, जिनकी सहायता से Dividing Head Spindle को Precise Angular Divisions में Rotate किया जा सकता है।
Q.55 If both left-hand and right-hand angles are required to be cut on a plate in a single setup, which tool and approach is most suitable?
एक ही Setup में Plate पर Left-Hand और Right-Hand दोनों Angles Cut करने के लिए कौन-सा Tool और Approach सबसे Suitable है?
A) Using a double angle milling cutter in a single pass / Double Angle Milling Cutter का Single Pass में उपयोग करना
B) Using a single angle milling cutter with two setups / Single Angle Milling Cutter को दो Setups में उपयोग करना
C) Using a side and face cutter for each angle separately / प्रत्येक Angle के लिए अलग Side and Face Cutter का उपयोग करना
D) Using an end mill with repeated passes for each side / प्रत्येक Side के लिए End Mill से Repeated Passes लेना
Answer: A) Using a double angle milling cutter in a single pass / Double Angle Milling Cutter का Single Pass में उपयोग करना
Description:
A double-angle milling cutter has cutting faces arranged to produce both required angular surfaces, allowing both left-hand and right-hand angles to be machined in a single setup.
हिंदी में:
Double-Angle Milling Cutter की Cutting Faces दोनों Required Angles के अनुसार होती हैं। इससे एक ही Setup में Left-Hand और Right-Hand दोनों Angles को Machine किया जा सकता है।
Q.56 Which file is best suited for filing internal corners?
Internal Corners की Filing के लिए कौन-सी File सबसे Suitable है?
A) Triangular file / Triangular File
B) Round file / Round File
C) Flat file / Flat File
D) Square file / Square File
Answer: A) Triangular file / Triangular File
Description:
A triangular file has three angled faces and is suitable for filing internal corners, V-shaped grooves, and other angular recesses.
हिंदी में:
Triangular File में तीन Angled Faces होती हैं। यह Internal Corners, V-Shaped Grooves और अन्य Angular Recesses की Filing के लिए Suitable होती है।
Q.57 In a ram type slotter, what is the main function of the column?
Ram Type Slotter में Column का मुख्य Function क्या है?
A) To support the ram and table / Ram और Table को Support करना
B) To provide reciprocating motion / Reciprocating Motion प्रदान करना
C) To cut the slot / Slot को Cut करना
D) To rotate the tool / Tool को Rotate करना
Answer: A) To support the ram and table / Ram और Table को Support करना
Description:
The column is the main supporting structure of a ram-type slotter. It supports the ram mechanism and the work-supporting table.
हिंदी में:
Column Ram-Type Slotter का Main Supporting Structure होता है। यह Ram Mechanism और Work-Supporting Table को Support करता है।
Q.58 A force of 10 newtons moves an object 2 metres. How much work is done?
10 Newton का Force किसी Object को 2 Metres Move करता है। किया गया Work कितना होगा?
A) 8 joules / 8 जूल
B) 12 joules / 12 जूल
C) 5 joules / 5 जूल
D) 20 joules / 20 जूल
Answer: D) 20 joules / 20 जूल
Description:
Work is calculated as Force × Distance.
Work = 10 N × 2 m = 20 J.
हिंदी में:
Work का Formula Force × Distance होता है।
Work = 10 N × 2 m = 20 J (जूल)।
Q.59 During a CNC lathe roughing operation, excessive tool wear and uneven stock removal are observed. Which adjustment will help to improve machining consistency and tool life?
CNC Lathe Roughing Operation के दौरान Excessive Tool Wear और Uneven Stock Removal दिखाई दे रहे हैं। Machining Consistency और Tool Life सुधारने के लिए कौन-सा Adjustment करना चाहिए?
A) Changing tool nose radius for a sharper edge / Sharper Edge के लिए Tool Nose Radius बदलना
B) Applying coolant flow during operation / Operation के दौरान Coolant Flow Apply करना
C) Increasing spindle speed during cutting / Cutting के दौरान Spindle Speed बढ़ाना
D) Adjusting feed and depth during cutting / Cutting के दौरान Feed और Depth Adjust करना
Answer: D) Adjusting feed and depth during cutting / Cutting के दौरान Feed और Depth Adjust करना
Description:
Proper adjustment of feed and depth of cut helps maintain consistent material removal and can reduce excessive tool loading and wear during roughing.
हिंदी में:
Feed और Depth of Cut को उचित रूप से Adjust करने से Material Removal अधिक Consistent रहता है तथा Roughing के दौरान Tool पर Excessive Load और Wear को कम करने में सहायता मिलती है।
Q.60 What is the main purpose of heat treatment in metals?
Metals में Heat Treatment का मुख्य उद्देश्य क्या है?
A) To reduce the cost of metal / Metal की Cost कम करना
B) To improve mechanical properties / Mechanical Properties को Improve करना
C) To change color of the metal / Metal का Color बदलना
D) To add weight to the metal / Metal का Weight बढ़ाना
Answer: B) To improve mechanical properties / Mechanical Properties को Improve करना
Description:
Heat treatment is used to modify the microstructure of metals and improve properties such as hardness, strength, toughness, and ductility.
हिंदी में:
Heat Treatment का उपयोग Metal की Microstructure को Modify करके Hardness, Strength, Toughness और Ductility जैसी Mechanical Properties को Improve करने के लिए किया जाता है।
Q.61 What is the primary factor in selecting nose radius for a single-point tool?
Single-Point Tool के लिए Nose Radius Select करने में Primary Factor क्या है?
A) Cutting speed needed / Required Cutting Speed
B) Desired surface finish / Desired Surface Finish
C) Tool material used / Used Tool Material
D) Chip flow direction / Chip Flow Direction
Answer: B) Desired surface finish / Desired Surface Finish
Description:
The nose radius has a significant effect on the resulting surface finish. A suitable nose radius helps produce the required finish while maintaining appropriate cutting performance.
हिंदी में:
Nose Radius का Machined Surface की Finish पर महत्वपूर्ण प्रभाव पड़ता है। इसलिए Required Surface Finish के अनुसार Suitable Nose Radius Select किया जाता है।
Q.62 A machinist needs to cut a rectangular pocket using CNC VMC. Which sequence best ensures accurate straight edges using linear interpolation?
CNC VMC में Rectangular Pocket Cut करने के लिए Linear Interpolation द्वारा Accurate Straight Edges प्राप्त करने हेतु कौन-सा Sequence सबसे सही है?
A) Program each side of the rectangle using G01 with defined start and end coordinates / Defined Start और End Coordinates के साथ G01 का उपयोग करके Rectangle की प्रत्येक Side को Program करना
B) Apply G02 to create all sides of rectangle as arcs with one radius value and fixed center / G02 का उपयोग करके एक Radius और Fixed Center से सभी Rectangle Sides को Arcs के रूप में बनाना
C) Use G03 to create all edges of rectangle as curved segments continuously with different radii / G03 का उपयोग करके सभी Rectangle Edges को Different Radii वाले Curved Segments के रूप में बनाना
D) Use G00 to move rapidly around the rectangular pocket without programming coordinates / G00 का उपयोग करके Coordinates Program किए बिना Rectangular Pocket के चारों ओर Rapid Movement करना
Answer: A) Program each side of the rectangle using G01 with defined start and end coordinates / Defined Start और End Coordinates के साथ G01 का उपयोग करके Rectangle की प्रत्येक Side को Program करना
Description:
G01 represents linear interpolation and is used to move the cutting tool along straight lines between programmed coordinates, making it suitable for machining the straight edges of a rectangular pocket.
हिंदी में:
G01 Linear Interpolation को दर्शाता है और Programmed Coordinates के बीच Tool को Straight Line में Move करता है। इसलिए Rectangular Pocket की Straight Edges बनाने के लिए G01 उपयुक्त है।
Q.63 A steel plate is 20 mm thick and 45 mm wide. What is the length of the diagonal across the plate?
एक Steel Plate की Thickness 20 mm और Width 45 mm है। Plate के Across Diagonal की Length कितनी होगी?
A) 45.00 mm / 45.00 mm
B) 47.20 mm / 47.20 mm
C) 51.00 mm / 51.00 mm
D) 49.24 mm / 49.24 mm
Answer: D) 49.24 mm / 49.24 mm
Description:
Using the Pythagorean theorem:
Diagonal = √(20² + 45²)
= √(400 + 2025)
= √2425
≈ 49.24 mm
हिंदी में:
Pythagorean Theorem के अनुसार:
Diagonal = √(20² + 45²)
= √2425
≈ 49.24 mm
इसलिए सही उत्तर 49.24 mm है।
Q.64 In unidirectional dimensioning, how are dimensions placed on the drawing sheet?
Unidirectional Dimensioning में Dimensions को Drawing Sheet पर कैसे रखा जाता है?
A) Dimensions are placed so they can be read from multiple edges / Dimensions इस प्रकार रखे जाते हैं कि उन्हें Multiple Edges से पढ़ा जा सके
B) Dimensions are placed so they can be read from the bottom edge / Dimensions इस प्रकार रखे जाते हैं कि उन्हें Bottom Edge से पढ़ा जा सके
C) Dimensions are placed so they can be read from random directions / Dimensions Random Directions से पढ़े जा सकें
D) Dimensions are placed so they can be read from diagonal angles / Dimensions Diagonal Angles से पढ़े जा सकें
Answer: B) Dimensions are placed so they can be read from the bottom edge / Dimensions इस प्रकार रखे जाते हैं कि उन्हें Bottom Edge से पढ़ा जा सके
Description:
In unidirectional dimensioning, all dimension figures are oriented in the same direction so that they can be read from the bottom of the drawing sheet.
हिंदी में:
Unidirectional Dimensioning में सभी Dimension Figures को एक ही Direction में रखा जाता है, ताकि उन्हें Drawing Sheet के Bottom Edge से पढ़ा जा सके।
Q.65 If a worker cannot find a tool quickly, which principle of Five S is likely not being followed?
यदि Worker को कोई Tool जल्दी नहीं मिल रहा है, तो Five S का कौन-सा Principle Follow नहीं हो रहा है?
A) Shine / Shine
B) Standardize / Standardize
C) Set in order / Set in Order
D) Sort / Sort
Answer: C) Set in order / Set in Order
Description:
“Set in Order” means arranging tools and materials systematically so that they are easy to locate and access when needed.
हिंदी में:
“Set in Order” का अर्थ Tools और Materials को व्यवस्थित तरीके से रखना है, ताकि आवश्यकता पड़ने पर उन्हें आसानी से Locate और Access किया जा सके।
Q.66 A machinist needs to calculate the displacement of the follower at 90° cam rotation in a plate cam with uniform velocity motion and a maximum lift of 20 mm over 180°. What will be the follower displacement at 90°?
Uniform Velocity Motion वाले Plate Cam में 180° के दौरान Maximum Lift 20 mm है। Cam के 90° Rotate होने पर Follower का Displacement कितना होगा?
A) 20 mm / 20 mm
B) 15 mm / 15 mm
C) 5 mm / 5 mm
D) 10 mm / 10 mm
Answer: D) 10 mm / 10 mm
Description:
With uniform velocity motion, the follower displacement is proportional to the cam rotation angle.
At 90°:
Displacement = (90° / 180°) × 20 mm = 10 mm
हिंदी में:
Uniform Velocity Motion में Follower का Displacement Cam Rotation Angle के Proportional होता है।
90° पर:
Displacement = (90° / 180°) × 20 mm = 10 mm
इसलिए सही उत्तर 10 mm है।
Q.67 Which machining problem can be minimized by correctly grinding a lathe cutting tool?
Lathe Cutting Tool को सही तरीके से Grind करने से कौन-सी Machining Problem को कम किया जा सकता है?
A) Overheating of the lathe machine / Lathe Machine का Overheating
B) Premature tool wear / Tool का समय से पहले Wear होना
C) Rusting of the tool / Tool में Rusting होना
D) Vibration of lathe / Lathe की Vibration
Answer: B) Premature tool wear / Tool का समय से पहले Wear होना
Description:
Correct tool geometry and grinding help maintain proper cutting action, reducing excessive loading and premature wear of the cutting tool.
हिंदी में:
Correct Tool Geometry और Proper Grinding से Cutting Action सही रहता है, जिससे Tool पर Excessive Loading कम होता है और Premature Tool Wear को कम किया जा सकता है।
Q.68 What is the main purpose of a color code in the context of lubrication management?
Lubrication Management में Color Code का मुख्य उद्देश्य क्या है?
A) To measure lubricant viscosity and performance characteristics / Lubricant की Viscosity और Performance Characteristics Measure करना
B) To identify lubricants and match them with application points / Lubricants को Identify करना और उन्हें सही Application Points से Match करना
C) To combine different lubricants for improved machine operation / Different Lubricants को Combine करना
D) To classify equipment according to maintenance schedules / Maintenance Schedule के अनुसार Equipment को Classify करना
Answer: B) To identify lubricants and match them with application points / Lubricants को Identify करना और उन्हें सही Application Points से Match करना
Description:
Color coding helps quickly identify the correct lubricant and its corresponding application point, reducing the risk of using the wrong lubricant.
हिंदी में:
Color Coding से सही Lubricant और उसके Corresponding Application Point को जल्दी Identify किया जा सकता है। इससे गलत Lubricant के उपयोग का Risk कम होता है।
Q.69 Why is depreciation included in the machine hour rate calculation?
Machine Hour Rate Calculation में Depreciation को क्यों शामिल किया जाता है?
A) It repairs equipment accurately / यह Equipment को Repair करता है
B) It pays operator wages / यह Operator Wages का भुगतान करता है
C) It spreads asset cost over use / यह Asset की Cost को उसके उपयोग के दौरान Spread करता है
D) It covers power expenses / यह Power Expenses को Cover करता है
Answer: C) It spreads asset cost over use / यह Asset की Cost को उसके उपयोग के दौरान Spread करता है
Description:
Depreciation represents the gradual consumption or loss of value of a machine over its useful life. Including it in the machine hour rate allocates this cost over the hours the machine is used.
हिंदी में:
Depreciation Machine की Useful Life के दौरान उसकी Value के Gradual Reduction को दर्शाता है। इसे Machine Hour Rate में शामिल करने से Machine की Cost को उसके उपयोग के Hours में Allocate किया जाता है।
Q.70 A CNC turning operation is set to cut an external metric thread on a steel workpiece. If the thread pitch and minor diameter are already specified, which parameter must be accurately programmed in the tool path to ensure the correct thread profile and depth?
CNC Turning में Steel Workpiece पर External Metric Thread बनाने के लिए Thread Pitch और Minor Diameter पहले से दिए गए हैं। सही Thread Profile और Depth के लिए Tool Path में कौन-सा Parameter Accurately Program करना आवश्यक है?
A) Tool nose radius compensation / Tool Nose Radius Compensation
B) Coolant flow rate adjustment / Coolant Flow Rate Adjustment
C) Thread depth per pass value / Thread Depth per Pass Value
D) Spindle RPM setting / Spindle RPM Setting
Answer: C) Thread depth per pass value / Thread Depth per Pass Value
Description:
The thread depth per pass determines how much material the tool removes during each threading pass and helps achieve the specified thread profile and final depth.
हिंदी में:
Thread Depth per Pass यह निर्धारित करता है कि प्रत्येक Threading Pass में Tool कितनी Material Remove करेगा। इससे Specified Thread Profile और Final Thread Depth को सही तरीके से प्राप्त करने में सहायता मिलती है।
Q.71 When should an operator use the Emergency Stop button on the CNC VMC panel during machining?
CNC VMC Panel पर Machining के दौरान Operator को Emergency Stop Button कब Use करना चाहिए?
A) If the program requires routine process adjustment / यदि Program में Routine Process Adjustment आवश्यक हो
B) If the program requires routine setup adjustment / यदि Program में Routine Setup Adjustment आवश्यक हो
C) If there is a risk of injury or machine damage / यदि Injury या Machine Damage का Risk हो
D) If the program needs editing or recalibration / यदि Program को Edit या Recalibrate करना हो
Answer: C) If there is a risk of injury or machine damage / यदि Injury या Machine Damage का Risk हो
Description:
The Emergency Stop button is intended for emergency conditions where continued machine operation could cause injury, equipment damage, or another unsafe situation.
हिंदी में:
Emergency Stop Button का उपयोग ऐसी Emergency Condition में किया जाता है जहाँ Machine को Continue चलाने से Injury, Machine Damage या Unsafe Situation का Risk हो।
Q.72 A CNC machinist completes a first part check and notes the outer diameter is correct, but the length is slightly off. What does this suggest about tool offset correction?
CNC Machinist ने First Part Check पूरा किया और पाया कि Outer Diameter सही है, लेकिन Length थोड़ी गलत है। यह Tool Offset Correction के बारे में क्या बताता है?
A) The X-axis tool offset needs to be decreased / X-Axis Tool Offset को Decrease करने की आवश्यकता है
B) Modify the program header for new coordinates / New Coordinates के लिए Program Header को Modify करना
C) The Z-axis tool offset needs adjustment, not the X-axis / Z-Axis Tool Offset को Adjust करना है, X-Axis को नहीं
D) Increase the spindle speed for better accuracy / Better Accuracy के लिए Spindle Speed बढ़ाना
Answer: C) The Z-axis tool offset needs adjustment, not the X-axis / Z-Axis Tool Offset को Adjust करना है, X-Axis को नहीं
Description:
On a CNC lathe, the X-axis primarily controls the diameter, while the Z-axis controls the tool position along the workpiece length. Since the diameter is correct but the length is slightly off, the Z-axis tool offset requires adjustment.
हिंदी में:
CNC Lathe में X-Axis मुख्य रूप से Diameter को Control करता है, जबकि Z-Axis Workpiece की Length के Along Tool Position को Control करता है। इसलिए Diameter सही होने और Length गलत होने पर Z-Axis Tool Offset को Adjust करना चाहिए।
Q.73 A measuring instrument must be selected for verifying the small diameter (d) of a finely finished Morse taper. Which option provides the most accurate and reliable measurement for this application?
Finely Finished Morse Taper के Small Diameter (d) को Verify करने के लिए कौन-सा Measuring Instrument सबसे Accurate और Reliable Measurement देगा?
A) A steel rule marked in millimeters / Millimeter Markings वाली Steel Rule
B) A vernier caliper with standard jaws / Standard Jaws वाला Vernier Caliper
C) A thread gauge for comparing different profiles / Different Profiles Compare करने के लिए Thread Gauge
D) A micrometer calibrated for small diameters / Small Diameters के लिए Calibrated Micrometer
Answer: D) A micrometer calibrated for small diameters / Small Diameters के लिए Calibrated Micrometer
Description:
A micrometer provides higher precision than a steel rule or standard vernier caliper and is suitable for accurately measuring small diameters on a finely finished component.
हिंदी में:
Micrometer, Steel Rule या Standard Vernier Caliper की तुलना में अधिक High Precision देता है और Finely Finished Component के Small Diameter को Accurately Measure करने के लिए Suitable है।
Q.74 A machinist is grinding a 200 mm long shaft with a feed of 2 mm per revolution at a speed of 40 revolutions per minute. What is the machining time required for one pass?
Machinist 200 mm Long Shaft को 2 mm प्रति Revolution Feed और 40 RPM की Speed पर Grind करता है। One Pass के लिए Machining Time कितना होगा?
A) 1.0 minute / 1.0 मिनट
B) 2.5 minutes / 2.5 मिनट
C) 3.5 minutes / 3.5 मिनट
D) 4.0 minutes / 4.0 मिनट
Answer: B) 2.5 minutes / 2.5 मिनट
Description:
Feed rate = 2 mm/rev × 40 rev/min = 80 mm/min
Machining time = Length ÷ Feed rate
= 200 ÷ 80
= 2.5 minutes
हिंदी में:
Feed Rate = 2 mm/rev × 40 rev/min = 80 mm/min
Machining Time = 200 ÷ 80 = 2.5 मिनट
इसलिए सही उत्तर 2.5 minutes है।
Q.75 Which of the following is the primary function of lubricants in grinding operations?
Grinding Operations में Lubricants का Primary Function क्या है?
A) To increase rotational speed of grinding wheel / Grinding Wheel की Rotational Speed बढ़ाना
B) To reduce friction between tool and workpiece / Tool और Workpiece के बीच Friction को कम करना
C) To remove metallic chips from the work area / Work Area से Metallic Chips को Remove करना
D) To supply the extra coolant to the workpiece / Workpiece को Extra Coolant Supply करना
Answer: B) To reduce friction between tool and workpiece / Tool और Workpiece के बीच Friction को कम करना
Description:
Lubricants reduce friction between the grinding tool and workpiece, helping reduce heat generation, tool wear, and damage to the finished surface.
हिंदी में:
Lubricants Grinding Tool और Workpiece के बीच Friction को कम करते हैं। इससे Heat Generation और Tool Wear कम होता है तथा Finished Surface की Quality बनाए रखने में सहायता मिलती है।
FAQ
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Q2. where rrb alp cbt2 part-b mcq questions and answers available?
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