MECHANICAL ENGINEERING- PAGE 8
Mechanical Engineering MCQs- Page 8
1. Which punch will give good punch mark for seating of drill bit ?
(A) Centre punch (B) Prick punch 30 degree
(C) Prick punch 60 degree (D) Hollow punch
Ans: A
2. Which type nut to protect the end of the bolt from damages ?
(A) Thumb nut (B) Wing nut (C) Cap nut (D) Grooved nut
Ans: C
3. Which one is other than file grade ?
(A) Rough (B) Single cut (C) Second cut (D) Bastard
Ans: B
4. How many diodes in an alternator for rectification purpose ?
(A) 6 (B) 3 (C) 2 (D) 4
Ans: A
5. The colour of Acetylene cylinder in an Oxy Acetylene gas welding :
(A) Black (B) Red (C) Maroon (D) Brown
Ans: C
6. The firing order of a six cylinder engine is :
(A) 1-5-6-3-2-4 (B) 1-4-2-6-3-5 (C) 1-6-3-2-4-5 (D) 1-5-2-4-6-3
Ans: B
7. Gas leakage between cylinder wall and piston is called :
(A) Bleeding (B) Cylinder leakage
(C) Blow by (D) Scavenging
Ans: C
8. The power interval of 3 cylinder engine is :
(A) 240 degree (B) 120 degree (C) 180 degree (D) 90 degree
Ans: A
9. The distance between the axis of crankpin and main journal is called :
(A) Crank web (B) Crankthrow (C) Crankcase (D) Crank thrust
Ans: B
10. The lack of tappet clearance will cause :
(A) Valve lag (B) Valves are not open
(C) Valves are not fully closed (D) Engine over heat
Ans: C
11. Excessive backlash of oil pump gears will cause :
(A) Reduce pressure (B) Increase pressure
(C) Oil leakage (D) No effect
Ans: A
12. What is the cause of excessive end play of crankshaft ?
(A) Worn out crankshaft (B) Worn out thrust bearing
(C) Worn out crankpin (D) Worn out shell bearing
Ans: B
13. Commonly used lapping abrasives are :
(A) Silicon carbide (B) Aluminium oxide
(C) Boron carbide (D) All of these
Ans: D
14. A three way catalytic convertor converts :
(A) CO, HC and NOx
(B) CO, HC and CO2
(C) CO, HC and SO2
(D) CO, HC and Particulate matter
Ans: A
15. In an engine evaporative emission controls :
(A) EGR (B) Canister
(C) Catalytic converter (D) SCR
Ans: B
16. In an engine cylinder bore and stroke are equal is called :
(A) Radial engine (B) Opposed engine
(C) Square engine (D) Under square engine
Ans: C
17. Product of swept volume and no. of cylinder is called :
(A) Cycle (B) Compression ratio
(C) Horse Power (D) Engine capacity
Ans: D
18. When new carbide tipped tools required re-sharpening it is first ground to rough form with
(A) Diamond wheel (B) Silicon carbide
(C) Sand stone (D) Green grit silicon carbide
Ans: D
19. In a Pneumatic governor engine vacuum pipe will broken :
(A) Engine stops (B) Run at full RPM
(C) Run at idle RPM (D) Not effect seriously
Ans: B
20. Which tool is used for removing taper shank drill bit ?
(A) Morse taper (B) Drill chuck
(C) Drift (D) Mallet
Ans: C
(A) Centre punch (B) Prick punch 30 degree
(C) Prick punch 60 degree (D) Hollow punch
Ans: A
2. Which type nut to protect the end of the bolt from damages ?
(A) Thumb nut (B) Wing nut (C) Cap nut (D) Grooved nut
Ans: C
3. Which one is other than file grade ?
(A) Rough (B) Single cut (C) Second cut (D) Bastard
Ans: B
4. How many diodes in an alternator for rectification purpose ?
(A) 6 (B) 3 (C) 2 (D) 4
Ans: A
5. The colour of Acetylene cylinder in an Oxy Acetylene gas welding :
(A) Black (B) Red (C) Maroon (D) Brown
Ans: C
6. The firing order of a six cylinder engine is :
(A) 1-5-6-3-2-4 (B) 1-4-2-6-3-5 (C) 1-6-3-2-4-5 (D) 1-5-2-4-6-3
Ans: B
7. Gas leakage between cylinder wall and piston is called :
(A) Bleeding (B) Cylinder leakage
(C) Blow by (D) Scavenging
Ans: C
8. The power interval of 3 cylinder engine is :
(A) 240 degree (B) 120 degree (C) 180 degree (D) 90 degree
Ans: A
9. The distance between the axis of crankpin and main journal is called :
(A) Crank web (B) Crankthrow (C) Crankcase (D) Crank thrust
Ans: B
10. The lack of tappet clearance will cause :
(A) Valve lag (B) Valves are not open
(C) Valves are not fully closed (D) Engine over heat
Ans: C
11. Excessive backlash of oil pump gears will cause :
(A) Reduce pressure (B) Increase pressure
(C) Oil leakage (D) No effect
Ans: A
12. What is the cause of excessive end play of crankshaft ?
(A) Worn out crankshaft (B) Worn out thrust bearing
(C) Worn out crankpin (D) Worn out shell bearing
Ans: B
13. Commonly used lapping abrasives are :
(A) Silicon carbide (B) Aluminium oxide
(C) Boron carbide (D) All of these
Ans: D
14. A three way catalytic convertor converts :
(A) CO, HC and NOx
(B) CO, HC and CO2
(C) CO, HC and SO2
(D) CO, HC and Particulate matter
Ans: A
15. In an engine evaporative emission controls :
(A) EGR (B) Canister
(C) Catalytic converter (D) SCR
Ans: B
16. In an engine cylinder bore and stroke are equal is called :
(A) Radial engine (B) Opposed engine
(C) Square engine (D) Under square engine
Ans: C
17. Product of swept volume and no. of cylinder is called :
(A) Cycle (B) Compression ratio
(C) Horse Power (D) Engine capacity
Ans: D
18. When new carbide tipped tools required re-sharpening it is first ground to rough form with
(A) Diamond wheel (B) Silicon carbide
(C) Sand stone (D) Green grit silicon carbide
Ans: D
19. In a Pneumatic governor engine vacuum pipe will broken :
(A) Engine stops (B) Run at full RPM
(C) Run at idle RPM (D) Not effect seriously
Ans: B
20. Which tool is used for removing taper shank drill bit ?
(A) Morse taper (B) Drill chuck
(C) Drift (D) Mallet
Ans: C
21. Crow foot is a special tool related to :
(A) Screw driver (B) Socket attachments
(C) Torque wrench (D) Pipe wrench
Ans: B
22. The least count of industrial depth micrometer is usually :
(A) 0.01 cm (B) 0.001 mm (C) 0.01 mm (D) 0.02 mm
Ans: C
23. Which chisel is used for removing metals after chain drilling ?
(A) Cross cut chisel (B) Diamond point chisel
(C) Flat chisel (D) Web chisel
Ans: D
24. A protective metal ring to prevent damage of tool handle is called :
(A) Ferrule (B) Tang (C) Heel (D) Edge
Ans: A
25. The tolerance zone of hole will be below the tolerance zone of shaft is called :
(A) Clearance fit (B) Transition fit (C) Interference fit (D) Tolerance fit
Ans: C
26. The point angle of general purpose drill bit is :
(A) 158 degree (B) 118 degree (C) 119 degree (D) 110 degree
Ans: B
27. Which key is useful for fastening tapered fittings of shaft ?
(A) Woodruff key (B) Saddle key (C) Sunk key (D) Gib-head key
Ans: A
28. In a Double cut file angle of Overcut is usually :
(A) 65 degree (B) 51 degree (C) 70 degree (D) 60 degree
Ans: C
29. Which one is the physical property of metal given below ?
(A) Hardness (B) Colour (C) Malleability (D) Tenacity
Ans: B
(A) Screw driver (B) Socket attachments
(C) Torque wrench (D) Pipe wrench
Ans: B
22. The least count of industrial depth micrometer is usually :
(A) 0.01 cm (B) 0.001 mm (C) 0.01 mm (D) 0.02 mm
Ans: C
23. Which chisel is used for removing metals after chain drilling ?
(A) Cross cut chisel (B) Diamond point chisel
(C) Flat chisel (D) Web chisel
Ans: D
24. A protective metal ring to prevent damage of tool handle is called :
(A) Ferrule (B) Tang (C) Heel (D) Edge
Ans: A
25. The tolerance zone of hole will be below the tolerance zone of shaft is called :
(A) Clearance fit (B) Transition fit (C) Interference fit (D) Tolerance fit
Ans: C
26. The point angle of general purpose drill bit is :
(A) 158 degree (B) 118 degree (C) 119 degree (D) 110 degree
Ans: B
27. Which key is useful for fastening tapered fittings of shaft ?
(A) Woodruff key (B) Saddle key (C) Sunk key (D) Gib-head key
Ans: A
28. In a Double cut file angle of Overcut is usually :
(A) 65 degree (B) 51 degree (C) 70 degree (D) 60 degree
Ans: C
29. Which one is the physical property of metal given below ?
(A) Hardness (B) Colour (C) Malleability (D) Tenacity
Ans: B
30. Drill chucks are hold on the machine spindle by means of
(A) chuck nut (B) drift (C) draw in bar (D) arbor
Ans: D
31. For machining a job on the shaper the length of the stroke should be
(A) equal to that job length. (B) more than job length. (C) less than the job length. (D) maximum length of stroke.
Ans: B
32. In a crank type shaping machine the length of the stroke can be increased or decreased by rotating the
(A) Vertical lead screw (B) Horizontal lead screw (C) Radial lead screw (D) Connecting rod
Ans: C
33. Quick return mechanism is used in
(A) milling machine (B) shaper (C) welding machine (D) grinding machine
Ans: B
34. The type of file used for wood work is
(A) single cut file (B) double cut file (C) rasp cut file (D) None of the above
Ans: C
35. The feed of shaper takes place
(A) at the middle of cutting stroke (B) at the middle of return stroke (C) at the start of return stroke (D) at the start of cutting stroke
Ans: D
36. A carbon steel piece is heated just above 730 °C, maintained at that temperature for a few hours and then slowly cooled. What heat treatment process is carried out ?
(A) Normalizing (B) Case hardening (C) Hardening (D) Annealing
Ans: A
37. Which among the following locators is best suitable for location of a round shaped job ?
(A) Pin type locator (B) Wedge type locator (C) Vee locator (D) Adjustable stop locator
Ans: C
38. The root of ISO metric thread is
(A) flat (B) round (C) sharp corner (D) None of the above
Ans: A
39. Grade-00 slip gauge are used in
(A) Work shop by operator (B) Inspection room
(C) Calibration (D) Neither (A) nor (B)
Ans: C
40. Metric outside micrometer has a threaded spindle with a pitch is
(A) 0.5 mm (B) 0.25 mm
(C) 0.02 mm (D) 0.01 mm
Ans: A
41. What is the hardening temperature for HSS tool ?
(A) 1250 °C (B) 950 °C
(C) 850 °C (D) 750 °C
Ans: A
42. Mass-produced component should be interchangeable, one of the following is the most important factor required to achieve the interchangeability in mass production :
(A) Dimensional accuracy (B) Geometrical accuracy
(C) Standardization (D) Surface finish
Ans: C
43. The symbol ∇ indicates the value of surface finish
(A) 40 to 80 microns (B) 16 to 40 microns
(C) below 16 microns (D) None of the above
Ans: A
44. Reciprocating movement of the table in planer is obtained by
(A) Loose and fast pulleys (B) Worm and worm wheel
(C) Rack and gear (D) Cam drive
Ans: A
45. The top and sides of the table of shaper usually have
(A) L-types slots (B) T-types slots
(C) U-types slots (D) I-types slots
Ans: B
46. Which one of the planning machine has only one column ?
(A) Pit planning machine (B) Plate planning machine
(C) Hydraulic planning machine (D) Open side planning machine
Ans: D
47. Which of the following washer is used where the loosening of bolts due to vibrations or shock are more likely to be ?
(A) Plain washer (B) Spring washer
(C) Tap washer (D) Fibre washer
Ans: B
48. Nut is a
(A) temporary fastener (B) semi-permanent fastener
(C) permanent fastener (D) None of the above
Ans: A
49. Which of the following instrument is used to check the hills and valley for the surface of the job ?
(A) By ammeter (B) By dial gauge
(C) By barometer (D) By Taly-surf
Ans: D
50. Jobs are placed in ash or _____ for annealing.
(A) lime stone (B) coke
(C) pig iron (D) All of these
Ans: A
(A) chuck nut (B) drift (C) draw in bar (D) arbor
Ans: D
31. For machining a job on the shaper the length of the stroke should be
(A) equal to that job length. (B) more than job length. (C) less than the job length. (D) maximum length of stroke.
Ans: B
32. In a crank type shaping machine the length of the stroke can be increased or decreased by rotating the
(A) Vertical lead screw (B) Horizontal lead screw (C) Radial lead screw (D) Connecting rod
Ans: C
33. Quick return mechanism is used in
(A) milling machine (B) shaper (C) welding machine (D) grinding machine
Ans: B
34. The type of file used for wood work is
(A) single cut file (B) double cut file (C) rasp cut file (D) None of the above
Ans: C
35. The feed of shaper takes place
(A) at the middle of cutting stroke (B) at the middle of return stroke (C) at the start of return stroke (D) at the start of cutting stroke
Ans: D
36. A carbon steel piece is heated just above 730 °C, maintained at that temperature for a few hours and then slowly cooled. What heat treatment process is carried out ?
(A) Normalizing (B) Case hardening (C) Hardening (D) Annealing
Ans: A
37. Which among the following locators is best suitable for location of a round shaped job ?
(A) Pin type locator (B) Wedge type locator (C) Vee locator (D) Adjustable stop locator
Ans: C
38. The root of ISO metric thread is
(A) flat (B) round (C) sharp corner (D) None of the above
Ans: A
39. Grade-00 slip gauge are used in
(A) Work shop by operator (B) Inspection room
(C) Calibration (D) Neither (A) nor (B)
Ans: C
40. Metric outside micrometer has a threaded spindle with a pitch is
(A) 0.5 mm (B) 0.25 mm
(C) 0.02 mm (D) 0.01 mm
Ans: A
41. What is the hardening temperature for HSS tool ?
(A) 1250 °C (B) 950 °C
(C) 850 °C (D) 750 °C
Ans: A
42. Mass-produced component should be interchangeable, one of the following is the most important factor required to achieve the interchangeability in mass production :
(A) Dimensional accuracy (B) Geometrical accuracy
(C) Standardization (D) Surface finish
Ans: C
43. The symbol ∇ indicates the value of surface finish
(A) 40 to 80 microns (B) 16 to 40 microns
(C) below 16 microns (D) None of the above
Ans: A
44. Reciprocating movement of the table in planer is obtained by
(A) Loose and fast pulleys (B) Worm and worm wheel
(C) Rack and gear (D) Cam drive
Ans: A
45. The top and sides of the table of shaper usually have
(A) L-types slots (B) T-types slots
(C) U-types slots (D) I-types slots
Ans: B
46. Which one of the planning machine has only one column ?
(A) Pit planning machine (B) Plate planning machine
(C) Hydraulic planning machine (D) Open side planning machine
Ans: D
47. Which of the following washer is used where the loosening of bolts due to vibrations or shock are more likely to be ?
(A) Plain washer (B) Spring washer
(C) Tap washer (D) Fibre washer
Ans: B
48. Nut is a
(A) temporary fastener (B) semi-permanent fastener
(C) permanent fastener (D) None of the above
Ans: A
49. Which of the following instrument is used to check the hills and valley for the surface of the job ?
(A) By ammeter (B) By dial gauge
(C) By barometer (D) By Taly-surf
Ans: D
50. Jobs are placed in ash or _____ for annealing.
(A) lime stone (B) coke
(C) pig iron (D) All of these
Ans: A
51. The included angle of acme thread is _____ degree.
(A) 30 (B) 29
(C) 47½ (D) 60
Ans: B
52. The percentage of carbon in grey cast iron is _____
(A) more than 6.67% (B) less than 2.1%
(C) more than 2.1% (D) None of these
Ans: C
53. Clearance between the mating parts is measured by which of the following gauge ?
(A) Dial gauge (B) Plug gauge
(C) Feeler gauge (D) Caliper gauge
Ans: C
54. The nut used to fix blade in hacksaw frame is _____
(A) Dome nut (B) Thumb nut
(C) Wing nut (D) Castle nut
Ans: C
55. Which drilling machine is used in mass production ?
(A) Bench type drilling machine (B) Pillar type drill press
(C) Portable drilling machine (D) Gang type drilling machine
Ans: D
56. In normalizing process, hot steel is made to cool by
(A) immersing it in oil (B) keeping it in still air at room temperature
(C) leaving it in cold air (D) immersing it in water
Ans: B
57. _____ marking media takes too much time to get dry and it makes clear lines.
(A) Prussian blue (B) Chalk
(C) Copper sulphate (D) None of the above
Ans: A
58. With the help of vernier bevel protractor any angle can be measure up to the accuracy of the _____ of 1 degree.
(A) 10th parts (B) 12th parts (C) 9th parts (D) 4th parts
Ans: B
59. The standard range of sizes covered in the BIS system of limit and fits are
(A) 0 to 10 mm (B) 0 to 100 mm (C) 25 to 400 mm (D) 0 to 500 mm
Ans: D
60. It is used for aligning the vice with shaping machine table in position.
(A) Steel rule (B) Straight edge
(C) Dial test indicator (D) Tee bolt
Ans: C
61. The tolerance of a hole is the difference between the
(A) maximum hole and minimum shaft (B) minimum hole and maximum shaft
(C) maximum hole and the maximum shaft (D) maximum hole and the minimum hole
Ans: D
62. Zero error of a 50-75 mm outside micrometer can be checked with
(A) dial test indicator (B) vernier height gauge (C) feeler gauge (D) test piece
Ans: D
63. In abrasive jet machining, the nozzle mounted in the fixture is made up of
(A) High Speed Steel (B) Aluminium Oxide
(C) Silicon Carbide (D) Tungsten Carbide
Ans: D
64. Which thread is used in lead screw of lathe ?
(A) Acme thread (B) Butters thread
(C) Square thread (D) Knuckle thread
Ans: A
65. Which type head stock have back gear mechanism ?
(A) All geared head stock (B) Stepped cone pulley head stock
(C) All of the above (D) None of the above
Ans: B
66. What is the purpose of clearance angle of lathe cutting tool ?
(A) To guide the chip away
(B) To avoid over heating
(C) To prevent the tool rubbing with the work
(D) To break the lengthy chips
Ans: C
67. For turning the work between centers, both faces of the work piece are drilled with
(A) Twist drill (B) Counter sunk
(C) Counter bore (D) Centre drill
Ans: D
68. In lathe the follower rest is fixed on
(A) Lathe bed (B) Saddle
(C) Tail stock (D) Carriage
Ans: B
69. Which mechanism is used to connect carriage to lead screw ?
(A) Rack and pinion (B) Screw cutting mechanism
(C) Half nut mechanism (D) Back gear mechanism
Ans: C
70. In a screw thread lead is equal to _____
(A) Pitch (B) Pitch X No. of start
(C) Pitch X Major diameter (D) Pitch X Minor diameter
Ans: B
71. Length of sine bar is
(A) Length of face
(B) Length between outside of two rollers
(C) Length between Centre of two rollers
(D) Length between inside of two rollers
Ans: C
72. Which of the following is not a good quality cutting fluid ?
(A) High heat absorption (B) High flash point
(C) Good lubricating quality (D) High viscosity
Ans: D
73. Which one of the following is an example of gravity feed lubricating system ?
(A) Stauffer screw down greaser (B) Wick feed lubricator
(C) Oil can (D) Grease gun
Ans: B
74. In CNC programming, code represent feed in mm/rev. is
(A) G70 (B) G71
(C) G95 (D) G96
Ans: C
75. In CNC machine, which control system have the facility to feed back information to the control ?
(A) Open loop control system (B) Closed loop control system
(C) Both (A) and (B) (D) None of the above
Ans: B
76. The rotary movement in z-axis of a CNC machine is called _____
(A) A-axis (B) B-axis
(C) C-axis (D) D-axis
Ans: C
77. In horizontal milling machine cutters are mounted on
(A) Spindle (B) Draw bar
(C) Arbor (D) Saddle
Ans: C
78. The radial distance between pitch circle and outside circle of a spur gear is known as _____
(A) Chordal addendum (B) Dedendum
(C) Circular pitch (D) Addendum
Ans: D
79. What is the maximum table tilting angle of a universal milling machine ?
(A) 45° (B) 55° (C) 60° (D) 75°
Ans: A
80. The ratio between pitch circle diameter in millimetres to number teeth of a spur gear is known as
(A) Circular pitch (B) Diametrical pitch
(C) Addendum (D) Module
Ans: D
81. If ______ is not tightened properly, the draw bolt will get loosened.
(A) Arbor (B) Lock nut
(C) Key (D) Arbor support
Ans: B
82. While using the long arbor, the arbor will sag if _____ is not used.
(A) Coller (B) Front brace
(C) Arbor support (D) Draw bar
Ans: C
83. Which number involute gear cutter is used to cut rack ?
(A) 1 (B) 2
(C) 3 (D) 4
Ans: A
84. Which type of slots is provided on the milling machine table for clamping work piece or work holding devices ?
(A) J-slot (B) T-slot
(C) C-slot (D) E-slot
Ans: B
85. In milling process the work is feeding against the direction of rotation of the cutter, the method is known as
(A) Straight milling (B) Opposite direction milling
(C) Up milling (D) Down milling
Ans: C
86. What is the cutting speed of a side and face milling cutter having outer dia. 125 mm and running at an rpm of 80 ?
(A) 31.4 M/min. (B) 62.8 M/min.
(C) 31.4 mm/min. (D) 62.8 mm/min.
Ans: A
87. Formula of simple indexing is
(A) N/40 (B) 40/N
(C) 30/N (D) N × 30
Ans: B
88. What is the pitch circle diameter of a spur gear of two module 47 teeth ?
(A) 94 mm (B) 98 mm
(C) 102 mm (D) 90 mm
Ans: A
89. Pitch of the table lead screw of milling machine is 5 mm, while linear indexing to get 1 mm movement how many times the crank of indexing head will turn ?
(A) 8 (B) 5
(C) 11 (D) 6
Ans: A
90. Which mechanism used in indexing head ?
(A) Nut and bolt (B) Worm and worm gear
(C) Indexing plate (D) Rack and pinion
Ans: B
91. A grinding wheel is specified as 32 A 46 H 8 V. In this, the letter ‘V’ represented for
(A) Grade (B) Grid size
(C) Structure (D) Bond
Ans: D
92. In center less grinding the longitudinal feed rate can be varied by changing _______
(A) Angle of inclination of control wheel
(B) Angle of inclination of grinding wheel
(C) Angle of inclination of work rest
(D) Movement of work rest
Ans: A
93. Which bond is used for heavy duty, large diameter wheels, a fine finish is required ?
(A) Shellac bond (B) Silicate bond
(C) Rubber bond (D) Resinoid bond
Ans: A
94. The grain size of grinding wheel is 24, it is a _____ grain wheel.
(A) Coarse (B) Medium
(C) Fine (D) Very Fine
Ans: A
95. In the marking system of grinding wheel, silicon carbide wheel is denoted by which letter ?
(A) O (B) A
(C) S (D) C
Ans: D
96. While grinding soft metals, the chips are get clogged between the abrasive particle of the wheel. This condition is known as
(A) Clogging (B) Glazing
(C) Loading (D) Pinning
Ans: C
97. Tool used to dressing the grinding wheel is
(A) File card (B) Wire brush
(C) Wheel balancer (D) Wheel dresser
Ans: D
98. The process of shaping of the grinding wheel to make it run concentric with axis is known as
(A) Dressing (B) Glazing
(C) Loading (D) Truing
Ans: D
99. In centre less grinder, for longitudinal feed the control wheel inclined at an angle of
(A) 1° – 7° (B) 9° – 15°
(C) 10° – 13° (D) 7° – 10°
Ans: A
100. Routing is essential in the following type of industry :
(a) Assembly industry (b) Process industry (c) Job order industry (d) Mass production industry Ans: A
(A) 30 (B) 29
(C) 47½ (D) 60
Ans: B
52. The percentage of carbon in grey cast iron is _____
(A) more than 6.67% (B) less than 2.1%
(C) more than 2.1% (D) None of these
Ans: C
53. Clearance between the mating parts is measured by which of the following gauge ?
(A) Dial gauge (B) Plug gauge
(C) Feeler gauge (D) Caliper gauge
Ans: C
54. The nut used to fix blade in hacksaw frame is _____
(A) Dome nut (B) Thumb nut
(C) Wing nut (D) Castle nut
Ans: C
55. Which drilling machine is used in mass production ?
(A) Bench type drilling machine (B) Pillar type drill press
(C) Portable drilling machine (D) Gang type drilling machine
Ans: D
56. In normalizing process, hot steel is made to cool by
(A) immersing it in oil (B) keeping it in still air at room temperature
(C) leaving it in cold air (D) immersing it in water
Ans: B
57. _____ marking media takes too much time to get dry and it makes clear lines.
(A) Prussian blue (B) Chalk
(C) Copper sulphate (D) None of the above
Ans: A
58. With the help of vernier bevel protractor any angle can be measure up to the accuracy of the _____ of 1 degree.
(A) 10th parts (B) 12th parts (C) 9th parts (D) 4th parts
Ans: B
59. The standard range of sizes covered in the BIS system of limit and fits are
(A) 0 to 10 mm (B) 0 to 100 mm (C) 25 to 400 mm (D) 0 to 500 mm
Ans: D
60. It is used for aligning the vice with shaping machine table in position.
(A) Steel rule (B) Straight edge
(C) Dial test indicator (D) Tee bolt
Ans: C
61. The tolerance of a hole is the difference between the
(A) maximum hole and minimum shaft (B) minimum hole and maximum shaft
(C) maximum hole and the maximum shaft (D) maximum hole and the minimum hole
Ans: D
62. Zero error of a 50-75 mm outside micrometer can be checked with
(A) dial test indicator (B) vernier height gauge (C) feeler gauge (D) test piece
Ans: D
63. In abrasive jet machining, the nozzle mounted in the fixture is made up of
(A) High Speed Steel (B) Aluminium Oxide
(C) Silicon Carbide (D) Tungsten Carbide
Ans: D
64. Which thread is used in lead screw of lathe ?
(A) Acme thread (B) Butters thread
(C) Square thread (D) Knuckle thread
Ans: A
65. Which type head stock have back gear mechanism ?
(A) All geared head stock (B) Stepped cone pulley head stock
(C) All of the above (D) None of the above
Ans: B
66. What is the purpose of clearance angle of lathe cutting tool ?
(A) To guide the chip away
(B) To avoid over heating
(C) To prevent the tool rubbing with the work
(D) To break the lengthy chips
Ans: C
67. For turning the work between centers, both faces of the work piece are drilled with
(A) Twist drill (B) Counter sunk
(C) Counter bore (D) Centre drill
Ans: D
68. In lathe the follower rest is fixed on
(A) Lathe bed (B) Saddle
(C) Tail stock (D) Carriage
Ans: B
69. Which mechanism is used to connect carriage to lead screw ?
(A) Rack and pinion (B) Screw cutting mechanism
(C) Half nut mechanism (D) Back gear mechanism
Ans: C
70. In a screw thread lead is equal to _____
(A) Pitch (B) Pitch X No. of start
(C) Pitch X Major diameter (D) Pitch X Minor diameter
Ans: B
71. Length of sine bar is
(A) Length of face
(B) Length between outside of two rollers
(C) Length between Centre of two rollers
(D) Length between inside of two rollers
Ans: C
72. Which of the following is not a good quality cutting fluid ?
(A) High heat absorption (B) High flash point
(C) Good lubricating quality (D) High viscosity
Ans: D
73. Which one of the following is an example of gravity feed lubricating system ?
(A) Stauffer screw down greaser (B) Wick feed lubricator
(C) Oil can (D) Grease gun
Ans: B
74. In CNC programming, code represent feed in mm/rev. is
(A) G70 (B) G71
(C) G95 (D) G96
Ans: C
75. In CNC machine, which control system have the facility to feed back information to the control ?
(A) Open loop control system (B) Closed loop control system
(C) Both (A) and (B) (D) None of the above
Ans: B
76. The rotary movement in z-axis of a CNC machine is called _____
(A) A-axis (B) B-axis
(C) C-axis (D) D-axis
Ans: C
77. In horizontal milling machine cutters are mounted on
(A) Spindle (B) Draw bar
(C) Arbor (D) Saddle
Ans: C
78. The radial distance between pitch circle and outside circle of a spur gear is known as _____
(A) Chordal addendum (B) Dedendum
(C) Circular pitch (D) Addendum
Ans: D
79. What is the maximum table tilting angle of a universal milling machine ?
(A) 45° (B) 55° (C) 60° (D) 75°
Ans: A
80. The ratio between pitch circle diameter in millimetres to number teeth of a spur gear is known as
(A) Circular pitch (B) Diametrical pitch
(C) Addendum (D) Module
Ans: D
81. If ______ is not tightened properly, the draw bolt will get loosened.
(A) Arbor (B) Lock nut
(C) Key (D) Arbor support
Ans: B
82. While using the long arbor, the arbor will sag if _____ is not used.
(A) Coller (B) Front brace
(C) Arbor support (D) Draw bar
Ans: C
83. Which number involute gear cutter is used to cut rack ?
(A) 1 (B) 2
(C) 3 (D) 4
Ans: A
84. Which type of slots is provided on the milling machine table for clamping work piece or work holding devices ?
(A) J-slot (B) T-slot
(C) C-slot (D) E-slot
Ans: B
85. In milling process the work is feeding against the direction of rotation of the cutter, the method is known as
(A) Straight milling (B) Opposite direction milling
(C) Up milling (D) Down milling
Ans: C
86. What is the cutting speed of a side and face milling cutter having outer dia. 125 mm and running at an rpm of 80 ?
(A) 31.4 M/min. (B) 62.8 M/min.
(C) 31.4 mm/min. (D) 62.8 mm/min.
Ans: A
87. Formula of simple indexing is
(A) N/40 (B) 40/N
(C) 30/N (D) N × 30
Ans: B
88. What is the pitch circle diameter of a spur gear of two module 47 teeth ?
(A) 94 mm (B) 98 mm
(C) 102 mm (D) 90 mm
Ans: A
89. Pitch of the table lead screw of milling machine is 5 mm, while linear indexing to get 1 mm movement how many times the crank of indexing head will turn ?
(A) 8 (B) 5
(C) 11 (D) 6
Ans: A
90. Which mechanism used in indexing head ?
(A) Nut and bolt (B) Worm and worm gear
(C) Indexing plate (D) Rack and pinion
Ans: B
91. A grinding wheel is specified as 32 A 46 H 8 V. In this, the letter ‘V’ represented for
(A) Grade (B) Grid size
(C) Structure (D) Bond
Ans: D
92. In center less grinding the longitudinal feed rate can be varied by changing _______
(A) Angle of inclination of control wheel
(B) Angle of inclination of grinding wheel
(C) Angle of inclination of work rest
(D) Movement of work rest
Ans: A
93. Which bond is used for heavy duty, large diameter wheels, a fine finish is required ?
(A) Shellac bond (B) Silicate bond
(C) Rubber bond (D) Resinoid bond
Ans: A
94. The grain size of grinding wheel is 24, it is a _____ grain wheel.
(A) Coarse (B) Medium
(C) Fine (D) Very Fine
Ans: A
95. In the marking system of grinding wheel, silicon carbide wheel is denoted by which letter ?
(A) O (B) A
(C) S (D) C
Ans: D
96. While grinding soft metals, the chips are get clogged between the abrasive particle of the wheel. This condition is known as
(A) Clogging (B) Glazing
(C) Loading (D) Pinning
Ans: C
97. Tool used to dressing the grinding wheel is
(A) File card (B) Wire brush
(C) Wheel balancer (D) Wheel dresser
Ans: D
98. The process of shaping of the grinding wheel to make it run concentric with axis is known as
(A) Dressing (B) Glazing
(C) Loading (D) Truing
Ans: D
99. In centre less grinder, for longitudinal feed the control wheel inclined at an angle of
(A) 1° – 7° (B) 9° – 15°
(C) 10° – 13° (D) 7° – 10°
Ans: A
100. Routing is essential in the following type of industry :
(a) Assembly industry (b) Process industry (c) Job order industry (d) Mass production industry Ans: A
· UPSC Exam Syllabus- Mechanical Engineering
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