D/MECH OBJECTIVE QUESTIONS
1. An accident is
(a)Unplanned event (b) non-controlled event (c) undesirable event (d) all of the above
Ans: d
2. Which one of the following is not the cost due to an accident?
(a)cost due to damage to machine, tools, material and property (b) cost of lost time of the injured
person (c) cost of compensation and medical aid (d) cost due to increase in production
Ans: d
3. The safe away of working is
(a) an effective and right way of working (b) an ancient way of working (c) a way of handling the work
in a hurry (d) a way of normal working
Ans: a
4. The best way of avoiding accident is by
(a) doing work in accident way b doing work in ones own way (c) observing safety rules related to job,
machine and work place (d) using safety equipment
Ans: c
5. In case of an accident, the victim should immediately be
(a) asked to take rest (b) enquired about the accident (c) attended to immediately (d) left to himself
without treatment
Ans: c
6. An oily floor should be cleaned by
(a) cotton waste (b) putting water (c) putting saw dust (d) spraying carbon dioxide or sand
Ans: c
7. Fire is a combination of
(a) fuel, light and oxygen (b) fuel, heat and oxygen (c) fuel, heat and carbon dioxide (d)
fuel, light and nitrogen
Ans: b
8. In case of arc welding, one should protect his eyes by
(a) dark glass screen (b) sun goggles (c) mask (d) clear glasses
Ans: a
9. While grinding one must use
(a) dark glass screen (b) mask (c) safety goggles (d) sun goggles
Ans: c
10. A hammer with loosely fitted handle will
(a) fly away and cause accident (b) absorb shock (c) have easy swing (d) convey more leverage
Ans: a
11. Emission norms are the levels of pollutants permitted for emission by a vehicle. The emission
emitted by a petrol engine are measured by
(a) gas detector (b) gas analyser (c) gas meter (d) gas igniter
Ans: b
12. What is determined while measuring a component?
(a) nominal size (b) actual size (c) specified size (d) scale size
Ans: b
13. Which of the following instruments is used for checking flatness and squareness of a surface?
(a) try square (b) vernier height gauge (c) slip gauge (d) bevel gauge
Ans: a
14. Which is NOT the use of a try square?
(a) measuring right angle (b) checking squareness (c) making straight lines at 90ᴼ against an edge
(d) setting workpiece at 90ᴼ
Ans: a
15. The minimum measurement that can be read with the help of a steel rule is
(a) 0.01 mm (b) 0.02 mm (c) 0.05 mm (d) 0.50 mm
Ans: d
16. Try square is used to check up an angle of
(a) 30ᴼ (b) 45ᴼ (c) 60ᴼ (d) 90ᴼ
Ans: d
17. In a metric micrometer, a complete revolution of thimble advances
(a) 0.01 mm (b) 0.25 mm (c) 0.50 (d) 1.00 mm
Ans: c
18. The least count of vernier bevel protractor is
(a) 1´ (b) 5´ (c) 10´ (d) 25´
Ans: b
19. The least count of a metric micrometer is
(a) 0.01 mm (b) 0.05 mm (c) 0.10 mm (d) 0.50 mm
Ans: a
20. An outside micrometer has a negative error. The correct reading can be taken by
(a) adding the negative error in the actual reading (b) deducting the negative error from the actual reading
(c) adding twice the negative error in the actual reading (d) deducting twice the negative error from the
actual reading
Ans: a
21. Which one of the following instruments is used to check the concentricity of the outside diameter?
(a) vernier calliper (b) outside micrometer (c) dial test indicator (d) dial calliper
Ans: c
22. Zero error in micrometer means
(a) there is negligible gap between the spindle and the anvil (b) micrometer is true (c) zero mark
on the thimble is not visible (d) zero on thimble and datum line on sleeve do not coincide when measuring
faces are in contact
Ans: d
23. Which one of the following instrument is used to measure accurately the angle of tapper?
(a) bevel gauge (b) bevel protractor (c) vernier bevel protractor (d) tapper gauge
Ans: c
24. The least count of vernier calliper is
(a) 0.10 mm (b) 0.01 mm (c) 0.05 mm (d) 0.02 mm
Ans: d
25. Ratchet stop is the micrometer helps to
(a) control the pressure (b) lock the spindle (c) adjust zero error (d) hold the workpiece
Ans: a
26. A micrometer has a positive error of 0.02 mm. What is the correct reading when the micrometer
measures 40.53 mm?
(a) 25.39 mm (b) 25037 mm (c) 25.43 mm (d) 25.45 mm
Ans: a
27. A micrometer has a negative error of 0.03 mm. What is the correct reading when the micrometer
measures 40.53 mm?
(a) 40.50 mm (b) 40056 mm (c) 40.46 mm (d) 40.59 mm
Ans: b
28. The zero graduation of the thimble division of an outside micrometer is below the datum line, when
the measuring faces of the micrometer are in contact, the error is
(a) negative (b) positive (c) zero (d) none
Ans: a
29. Vernier depth gauge is used to measuring
(a) external dimensions (b) internal dimensions (c) step, depth of blind hole (d) pitch diameter
Ans: c
Which of the following statement is correct?
(a) gauges are used to check the size (b) templates are used to check the size (c) gauges are used to measure
size (d) gauges are used to check the shape of components
Ans: a
30. A feeler gauge is used for
(a) adjusting the parts for play (b) checking the gap between mating parts (c) checking radii of job (d)
checking accuracy of hole
Ans: b
31. Centre gauge is used for
(a) setting the lathe tool at correct centre height (b) checking the pitch of thread (c) checking the fit of
thread (d) checking the profile of thread
Ans: a
32. Gauges are made of
(a) cast iron (b) cast steel (c) alloy steel (d) mild steel
Ans: c
33. Thread ring gauge is used for checking
(a) external threads (b) internal threads (c) external diameter of cylindrical jobs (d) internal diameter of
jobs
Ans: a
34. Which one of the following gauges is used for checking cylinders, which are not kept in vertical or
horizontal position?
(a) plug gauge (b) ring gauge (c) snap gauge (d) pilot gauge
Ans: d
35. Clearance between mating parts is measured by
(a) dial gauge b Go gauge (c) feeler gauge (d) calliper gauge
Ans: c
36. A sine bar is available in standard sizes. Which one of the following is NOT a standard size of the
sine bar?
(a) 100 mm (b) 200 mm (c) 250 mm (d) 300 mm
Ans: d
37. The piston of a tire pressure gauge is made of
(a) cast iron (b) aluminium (c) plastic (d) soft rubber
Ans: d
38. The tool, which is used for laying out large circles is
(a) trammel (b) divider (c) jenny calliper (d) scriber
Ans: a
39. The point angle of scriber is
(a) 30° (b) 60° (c) 5° to 10° (d) 12° to 15°
Ans: d
40. The point angle of centre punch is
(a) 30° (b) 60° (c) 90° (d) 120°
Ans: c
41. During marking, the reference surface is provided by
(a) sketch of the job (b) workpiece (c) marking off table surface (d) surface gauge
Ans: c
42. A divider is used for
(a) scribing circles (b) scribing arcs (c) transferring and stepping distances (d) all of the above
Ans: d
43. Scriber is made of
(a) copper (b) high carbon steel (c) mild steel (d) cast iron
Ans: b
44. What type of threads are suitable for small precision components and measuring gauges?
(a) british association threads (b) whitworth screw threads (c) acme threads (d) square threads
Ans: a
45. What type of threads are suitable for the lead screws of machine tools?
(a) british association threads (b) whitworth screw threads (c) acme threads (d) square threads
Ans: c
46. Which one of the following screw thread forms has an included angle of 29° between the flanks of
threads?
(a) B.A. thread (b) acme thread (c) buttress thread (d) knuckle thread
Ans: b
47. The pitch diameter of the external screw thread is checked by
(a) screw pitch gauge (b) thread ring gauge (c) screw thread micrometer (d) vernier calliper
Ans: c
48. A key is subjected to
(a) shear stress (b) compressive stress (c) tensile stress(d) twisting stress
Ans: a
49. Which one of the following keys is used on automobile shaft?
(a) gib head key (b) taper key (c) woodruff key (d) hollow saddle key
Ans: c
50. Which type of key is used for coupling a pulley with a shaft?
(a) square threads (b) woodruff key (c) gib head key (d) flat saddle key
Ans: c
51. The upper portion of a hexagonal nut is chamfered at an angle of
(a) 75° (b) 60° (c) 45° (d) 30°
Ans: d
52. The dimension of a nut is expressed in term of
(a) head of the bolt (b) nominal diameter of the bolt (c) core diameter of the bolt (d) pitch diameter of the bolt
Ans: b
53. Which one of the following thread forms is used in a threaded assembly where the sliding force acts
in one direction only?
(a) square thread (b) V thread (c) saw-tooth thread (d) knuckle thread
Ans: c
54. A rivet is specified by the diameter of its
(a) head (b) tail (c) shank (d) none of the above
Ans: c
55. B.S.F. screw threads have the included angle of
(a) 30° (b) 45° (c) 55° (d) 60°
Ans: c
56. The shape of a woodruff key is
(a) round with tapper (b) in the form of a segment of a circle (c) rectangular (d) square with taper
Ans: b
57. For fitting a saddle key
(A) no keyway is cut on the shaft (b) long keyway is cut on the shaft (c) the key is fitted by means of crews (d) the lower portion of the key is machined in a curved form
Ans: a
58. A key is a device used to
(a) fasten the mating parts (b) start the machine (c) stop the machine (d) control the machine
Ans: a
59. Which one of the following threads, is used on mechanical jack?
(a) acme (b) square (c) buttress (d) B.S.F.
Ans: b
60. A nut having raised height and slots on the raised portion is called
(a) sawn nut (b) slotted nut (c) castle nut (d) pin hole nut
Ans: c
61. Which one of the following thread forms on bolts and nuts is meant for general fastening purposes?
(a) V thread (b) square threads (c) knuckle threads (d) acme threads
Ans: a
62. Spring washers are used under nuts to prevent
(a) damage to be bolt (b) damage to the nut (c) damage to the job (d) slackness of nuts due to vibrations
Ans: d
63. A tab washer is used for
(a) self-locking (b) locking the nuts (c) avoiding vibration (d) fastening vibration work
Ans: c
64. A plane washer helps to
(a) distribute the force over a large area (b) distribute the force to the nut (c) cover the clearance hole of the job (d) improve appearance of the job
Ans: a
65. Which one of the following reasons is responsible for crushing of metal in the riveted point?
(a) thickness of plates is more (b) thickness of plates is less (c) diameter of rivet is too large (d) diameter of rivet is too small
Ans: c
66. Which one of the following reason is responsible for shearing of rivet in a riveted joint?
(a) diameter of the rivet is too small (b) diameter of the rivet is too large (c) thickness of plates vary (d)pitch of the holes is too small
Ans: a
67.The cutting action of a file depends upon
(a) the kind of cut and spacing of teeth (b) arrangement of teeth on the file (c) size and shape of the file
(d) all of the above
Ans: d
68. Hacksaw blade teeth get dull due to
(a) high speed and pressure (b) pressure not released during return stroke (c) coolant not used (d) any one of the above
Ans: d
69. Which one of the following is NOT the reason for making file faces slightly convex in form?
(a) to increase the friction between the file face and the job surface (b) to give better distribution of the pressure and to compensate slight filing movement. (c) to reduce the friction between the file face and the job surface. (d) to reduce the effort in driving a file.
Ans: a
70. Which one of the following designations does NOT denote the grade of a file?
(a) bastard (b) first cut (c) second cut (d) smooth
Ans: b
71. A double cut file is used for filing on
(a) wood (b) hard board (c) leather (d) steel
Ans: d
72. Second cut in a file is the type of
(a) section (b) grade (c) cut (d) design
Ans: b
73. The body of a flat chisel is usually made in the shape of
(a) rectangular (b) square (c) hexagonal (d) octagonal
Ans: d
74. The chisel used to cut keyways is
(a) cape chisel (b) flat chisel (c) round nose chisel (d) diamond point chisel
Ans: a
75. Both sides of a flat bastard file have
(a) no cut (b) single cut teeth (c) double cut teeth (d) wavy teeth
Ans: c
76. The length of hacksaw blade is measured from
(a) one end of the toothed portion to the other end (b) centre of one pin hole to the centre of other pinhole
(c) end to end of blade (d) end of one hole to the end of the other pin hole
Ans: b
77. The new hacksaw blade should not be used in the blind saw cut made by old blade because
(a) the space is not enough to run the blade (b) the blade is costly (c) the new blade has sharp teeth
(d) none of the above
Ans: a
78. The safe edge of file is used to
(a) give best finishing (b) protect the adjacent sides (c) finish flat surfaces only (d) cut metal very
quickly
Ans: b
79. File card is used for
(a) cleaning the work piece (b) cleaning the file teeth (c) renewing the file teeth (d) cleaning the
chips
Ans: b
80. Setting of teeth in hacksaw blade is
(a) not required (b) required to avoid friction between the blade and work piece (c) required for
increasing the strength of blade (d) required for providing teeth on the blade
Ans: b
81. Which one of the following materials is used for making a grinding wheel?
(a) silicon carbide (b) granite (c) sand (d) calcium carbonate
Ans: a
82. A slight convexity is made on the cutting edges of flat chisel for
(a) cutting sharp corners. (b) allowing lubricant to reach the cutting edge. (c) cutting curved surfaces.
(d) preventing digging of the ends of cutting edge.
Ans: d
83. While chipping, the clearance angle is the angle between
(a) the working surface of the job and the top surface of cutting edge of chisel (b) the working surface of the job and the bottom surface of cutting edge of chiseljob (c) the surface at right angle to the cutting edge of chisel and the workig surface of the (d) none of the above
Ans: b
84. The most suitable pitch of the hacksaw blade of cutting thin section tubes is
(a) 0.8 mm (b) 1.0 mm (c) 1.4 mm (d) 1.8 mm
Ans: a
85. The suitable pitch of hacksaw for cutting solid brass is
(a) 0.8 mm (b) 1.0 mm (c) 1.4 mm (d) 1.8 mm
Ans: d
86. The commonly used standard length of hacksaw blade is
(a) 100 mm (b) 150 mm (c) 200 mm (d) 250 mm
Ans: d
87. Which among the following is an artificial abrasive?
(a) aluminium oxide (b) emery (c) diamond (d) corundum
Ans: a
88 The difference between the maximum and the minimum sizes allowed in manufactured
components is called:
(a) clearance (b) allowance (c) tolerance (d) limit
Ans: c
89. The measured size of the dimension of a component is called
(a) basic size (b) nominal size (c) allowed size (d) actual size
Ans: d
90. Under the terminology of the IS system of limits the term tolerance is defied as the difference between the
(a) maximum limit and the basic size (b) minimum limit and the basic size (c) maximum limit and
minimum limit (d) actual size and basic size
Ans: c
91. The propose of normalizing is to
(a) Remove induced stresses (b) Improve machinability (c) Soften the steel (d) Increase the toughness and reduce brittleness
Ans: a
92. 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: d
93.Heat treatment of metals is necessary
(a) To produce certain desired properties (b) To make good appearance on the component (c) To Increase strength of metal (d) To make the metal rust proof
Ans: a
94.What is the main purpose of annealing ?
(a) To improve mach inability (b) To improve magnetism (c)
To Increase Hardness (d) To Increase toughness
Ans: a
95.The unit of capacitance is
(a) ohm (b) mho (c) Siemens (d) farad
Ans: d
96. According to Ohms low, which one of the following relationship is correct?
(a) V= I/R (b) R= V.I (c) I= V/R (d) I= V.R
Ans: c
97. The two popular semi conductor materials are
(a) gallium and indium (b) aluminium and antimony (c) germanium and silicon (d) arsenic and boron
Ans: c
98. The diode used for voltage regulation is
(a) rectifier diode (b) zener diode (c) signal diode (d) varicap diode
Ans: b
99. The principle applied in lead-acid battery used in vehicle is called
(a) electrosynthesis (b) electrolysis (c) electroplating (d) electroenergy
Ans: b
100. A 4-stroke produces one power stroke in
(a) 2 revolutions of crankshaft (b) 4 revolutions of crankshaft (c) 6 revolutions of crankshaft (d) 8 revolutions of crankshaft
Ans: a
101. A 2-stroke cycle engine produces one power stroke in
(a) each revolution of crankshaft (b) 2 revolutions of crankshaft (c) 3 revolutions of crankshaft (d) 4 revolutions of crankshaft
Ans: a
102. Which one of the following gives the correct position of inlet and exhaust valves during the power stroke?
(a) inlet valve opens and exhaust valve closes (b) exhaust valve opens and inlet valve closes (c) both valves remain in closed position (d) both valves remain in open position
Ans: c
103. In an engine stroke length is
(a) half the throw of crank (b) equal to throw of crank (c) double the throw of crank (d) three times the throw of crank
Ans: c
104. The stroke of an engine is
(a) inside diameter of the cylinder (b) distance between TDC and BDC (c) volume of the cylinder (d) length of the connecting rod
Ans: b
105. Which one of the following engine components carries the engine over its non-working strokes?
(a) piston (b) crankshaft (c) connecting rod (d) flywheel
Ans: d
106. Air-fuel mixture in a petrol engine is burnt in
(a) intake manifold (b) exhaust manifold (c) cylinder (d) piston
Ans: c
107. What is drawn in the cylinder of diesel engine during suction stroke?
(a) a mixture of air and fuel (b) pure air alone (c) fuel alone (d) gas
Ans: b
108. In a diesel engine, fuel and air mix together in the
(a) carburettor (b) injector (c) combustion chamber (d) inlet port
Ans: c
109. In diesel engine, the fuel is ignited by
(a) a glow plug (b) a spark plug (c) an injector (d) virtue of temperature of compressed air
Ans: d
110. What is compressed in the cylinder of a diesel engine during the compression stroke?
(a) diesel fuel (b) pure air (c) air-fuel mixture (d) petrol
Ans: b
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