MECHANICAL ENGINEERING- PAGE 12
Mechanical Engineering MCQs- Page 12
1. Purpose of normalizing is to
(a) improve strength (b) increase hardness (c) remove internal stresses (d) None of these
Ans: C
2. Which of the following metals does not have hexagonal close packed structure ?
(a) Magnesium (b) Zinc (c) Cadmium (d) Copper
Ans: D
3. Which element makes stainless steel corrosion resistant ?
(a) Vanadium (b) Chromium (c) Carbon (d) Sulphur
Ans: B
4. The process of formation of new grains on heating metals is called
(a) Recrystallization (b) Oxidation (c) Microstructure (d) Hardening
Ans: A
5. Brass is an alloy of
(a) Copper and Zinc (b) Copper and Tin (c) Arsenic and Tin (d) Gold and Tin
Ans: A
6. Which of the following has maximum ductility ?
(a) Copper (b) Mild Steel (c) Cast Iron (d) 18-4-1 Steel
Ans: A
7. Paramagnetic alpha iron changes to gamma iron at following temperature :
(a) 768 °C (b) 1440 °C (c) 908 °C (d) 1539 °C
Ans: C
8. Eutectoid steel contains following percentage of carbon
(a) 0.02 (b) 0.30 (c) 0.63 (d) 0.87
Ans: D
9. The material having same elastic property in all the directions are called
(a) Ideal materials (b) Uniform materials (c) Isotropic materials (d) Practical materials
Ans: C
10. The ability of material to resist softening at higher temperature is known as
(a) Creep (b) Hot tempering (c) Hot hardness (d) Fatigue
Ans: C
11. The slowest cooling rate is achieved when steel is quenched in
(a) fused salt (b) air (c) brine (d) mixture of water and oil
Ans: B
12. Toughness is related to
(a) Moment of inertia (b) Hardness (c) Energy absorbed before fracture (d) Fatigue loading
Ans: C
13. Which among the followings is the most effective strengthening mechanism of non-ferrous materials ?
(a) Solid solution hardening (b) Strain hardening (c) Grain size refinement (d) Precipitation hardening
Ans: D
14. If T is the recrystallization temperature, the cold working of steel is done at
(a) greater than T °C (b) equal to T °C (c) less than T °C (d) None of these
Ans: C
15. Pure iron at room temperature has following micro structure :
(a) γ-iron (b) δ-iron (c) Cementite (d) α-iron
Ans: D
16. Which of the following materials is not desirable for rivets making ?
(a) Mild steel (b) Cast iron (c) Aluminium (d) Copper
Ans: B
17. When a nut is tightened by placing a washer below it, the bolt will be subjected to
(a) Tensile stress (b) Compressive stress (c) Shear stress (d) None of these
Ans: A
18. The sleeve of Muff coupling is designed as a
(a) Thin cylinder (b) Thick cylinder (c) Solid shaft (d) Hollow shaft
Ans: D
19. The usual proportion for the width of key is (where d is the diameter of the shaft)
(a) d/ 8
(b) d /6
(c) d/ 4
(d) d /2
Ans: C
20. What is the function of a washer ?
(a) Provides cushioning effect (b) Provides bearing area
(c) Absorbs shocks and vibrations (d) Provides smooth surface in place of rough surface
Ans: B
21. Anti friction bearings are
(a) hydro-dynamic bearings (b) sleeve bearings (c) thin lubricated bearings (d) ball and roller bearings
Ans: D
22. A key connecting a flange coupling to a shaft is likely to fail in
(a) shear (b) tension (c) torsion (d) bending
Ans: A
23. Piston rod and cross head in a steam engine are usually connected by means of
(a) cotter joint (b) knuckle joint (c) ball joint (d) universal joint
Ans: A
24. In a gib and cotter joint, the gib and cotter are subjected to
(a) single shear only (b) double shear (c) single shear and crushing (d) double shear and crushing
Ans: B
(a) improve strength (b) increase hardness (c) remove internal stresses (d) None of these
Ans: C
2. Which of the following metals does not have hexagonal close packed structure ?
(a) Magnesium (b) Zinc (c) Cadmium (d) Copper
Ans: D
3. Which element makes stainless steel corrosion resistant ?
(a) Vanadium (b) Chromium (c) Carbon (d) Sulphur
Ans: B
4. The process of formation of new grains on heating metals is called
(a) Recrystallization (b) Oxidation (c) Microstructure (d) Hardening
Ans: A
5. Brass is an alloy of
(a) Copper and Zinc (b) Copper and Tin (c) Arsenic and Tin (d) Gold and Tin
Ans: A
6. Which of the following has maximum ductility ?
(a) Copper (b) Mild Steel (c) Cast Iron (d) 18-4-1 Steel
Ans: A
7. Paramagnetic alpha iron changes to gamma iron at following temperature :
(a) 768 °C (b) 1440 °C (c) 908 °C (d) 1539 °C
Ans: C
8. Eutectoid steel contains following percentage of carbon
(a) 0.02 (b) 0.30 (c) 0.63 (d) 0.87
Ans: D
9. The material having same elastic property in all the directions are called
(a) Ideal materials (b) Uniform materials (c) Isotropic materials (d) Practical materials
Ans: C
10. The ability of material to resist softening at higher temperature is known as
(a) Creep (b) Hot tempering (c) Hot hardness (d) Fatigue
Ans: C
11. The slowest cooling rate is achieved when steel is quenched in
(a) fused salt (b) air (c) brine (d) mixture of water and oil
Ans: B
12. Toughness is related to
(a) Moment of inertia (b) Hardness (c) Energy absorbed before fracture (d) Fatigue loading
Ans: C
13. Which among the followings is the most effective strengthening mechanism of non-ferrous materials ?
(a) Solid solution hardening (b) Strain hardening (c) Grain size refinement (d) Precipitation hardening
Ans: D
14. If T is the recrystallization temperature, the cold working of steel is done at
(a) greater than T °C (b) equal to T °C (c) less than T °C (d) None of these
Ans: C
15. Pure iron at room temperature has following micro structure :
(a) γ-iron (b) δ-iron (c) Cementite (d) α-iron
Ans: D
16. Which of the following materials is not desirable for rivets making ?
(a) Mild steel (b) Cast iron (c) Aluminium (d) Copper
Ans: B
17. When a nut is tightened by placing a washer below it, the bolt will be subjected to
(a) Tensile stress (b) Compressive stress (c) Shear stress (d) None of these
Ans: A
18. The sleeve of Muff coupling is designed as a
(a) Thin cylinder (b) Thick cylinder (c) Solid shaft (d) Hollow shaft
Ans: D
19. The usual proportion for the width of key is (where d is the diameter of the shaft)
(a) d/ 8
(b) d /6
(c) d/ 4
(d) d /2
Ans: C
20. What is the function of a washer ?
(a) Provides cushioning effect (b) Provides bearing area
(c) Absorbs shocks and vibrations (d) Provides smooth surface in place of rough surface
Ans: B
21. Anti friction bearings are
(a) hydro-dynamic bearings (b) sleeve bearings (c) thin lubricated bearings (d) ball and roller bearings
Ans: D
22. A key connecting a flange coupling to a shaft is likely to fail in
(a) shear (b) tension (c) torsion (d) bending
Ans: A
23. Piston rod and cross head in a steam engine are usually connected by means of
(a) cotter joint (b) knuckle joint (c) ball joint (d) universal joint
Ans: A
24. In a gib and cotter joint, the gib and cotter are subjected to
(a) single shear only (b) double shear (c) single shear and crushing (d) double shear and crushing
Ans: B
25. A knee is part of the following :
(a) Shaper (b) Lathe (c) Milling machine (d) Slotter
Ans: C
26. Seasoning of timber refers to
(a) removing of moisture (b) adding moisture (c) cutting in desired shape (d) removing curves
Ans: A
27. Which is the hardest wood ?
(a) Teak (b) Tun (c) Shisham (d) Babul
Ans: C
28. Poise is the unit of
(a) mass density (b) kinematic viscosity (c) dynamic viscosity (d) velocity gradient
Ans: C
29. Two stroke engines have
(a) valves (b) ports (c) both (a) & (b) (d) None of these
Ans: B
30. Compression ratio of diesel engine is in the range of
(a) 8 to 10 (b) 10 to 15 (c) 16 to 20 (d) None of these
Ans: C
31. Capillary action is due to the
(a) viscosity of liquid (b) cohesion of liquid particles (c) surface tension (d) None of these
Ans: C
32. Cavitation is caused by
(a) high velocity (b) low barometric pressure (c) high pressure (d) low pressure
Ans: D
33. Continuous chip may be formed while machining
(a) brittle material (b) hard material (c) tough material (d) ductile material
Ans: D
34. In which type of welding, molten metal is poured for joining the metals ?
(a) Arc welding (b) Thermit welding (c) MIG (d) TIG
Ans: B
35. Grey iron is usually welded by
(a) Arc welding (b) Gas welding (c) TIG (d) MIG
Ans: B
36. The process of cutting thin gears from metal sheet is known as
(a) extruding (b) stamping (c) sintering (d) rolling
Ans: B
37. Which wood can be used for making patterns ?
(a) Mahogany (b) Pine wood (c) Teak wood (d) Any of these
Ans: D
38. Cohesiveness of sand depends on
(a) grain size and shape of sand particles (b) bounding material (c) moisture content (d) All of these
Ans: D
39. Electronic components are often joined by
(a) adhesive (b) soldering (c) brazing (d) welding
Ans: B
(a) Shaper (b) Lathe (c) Milling machine (d) Slotter
Ans: C
26. Seasoning of timber refers to
(a) removing of moisture (b) adding moisture (c) cutting in desired shape (d) removing curves
Ans: A
27. Which is the hardest wood ?
(a) Teak (b) Tun (c) Shisham (d) Babul
Ans: C
28. Poise is the unit of
(a) mass density (b) kinematic viscosity (c) dynamic viscosity (d) velocity gradient
Ans: C
29. Two stroke engines have
(a) valves (b) ports (c) both (a) & (b) (d) None of these
Ans: B
30. Compression ratio of diesel engine is in the range of
(a) 8 to 10 (b) 10 to 15 (c) 16 to 20 (d) None of these
Ans: C
31. Capillary action is due to the
(a) viscosity of liquid (b) cohesion of liquid particles (c) surface tension (d) None of these
Ans: C
32. Cavitation is caused by
(a) high velocity (b) low barometric pressure (c) high pressure (d) low pressure
Ans: D
33. Continuous chip may be formed while machining
(a) brittle material (b) hard material (c) tough material (d) ductile material
Ans: D
34. In which type of welding, molten metal is poured for joining the metals ?
(a) Arc welding (b) Thermit welding (c) MIG (d) TIG
Ans: B
35. Grey iron is usually welded by
(a) Arc welding (b) Gas welding (c) TIG (d) MIG
Ans: B
36. The process of cutting thin gears from metal sheet is known as
(a) extruding (b) stamping (c) sintering (d) rolling
Ans: B
37. Which wood can be used for making patterns ?
(a) Mahogany (b) Pine wood (c) Teak wood (d) Any of these
Ans: D
38. Cohesiveness of sand depends on
(a) grain size and shape of sand particles (b) bounding material (c) moisture content (d) All of these
Ans: D
39. Electronic components are often joined by
(a) adhesive (b) soldering (c) brazing (d) welding
Ans: B
40. An axial flow compressor will have symmetrical blades for a degree of reaction :
(a) 25% (b) 50% (c) 75% (d) 100%
Ans: B
41. The function of lubrication in engines are
(a) lubrication and cooling (b) cleaning, sealing and noise reduction (c) efficiency enhancement (d) both (a) and (b)
Ans: D
42. In which cycle, all the four processes are not reversible ?
(a) Carnot cycle (b) Joule cycle (c) Vapour compression cycle (d) None of these
Ans: C
43. Wet compression in vapour compression cycle means
(a) presence of water in refrigerant vapour during compression
(b) presence of liquid refrigerant in refrigerant vapour during compression
(c) compression of liquid refrigerant only
(d) compression of water only
Ans: B
44. In an ideal vapour absorption system, the absorber pressure is equal to the pressure of
(a) generator (b) condenser (c) evaporator (d) expansion device
Ans: C
45. A sample of moist air is at a DBT of 25 °C, WBT of 18 °C and DPT of 13 °C and corresponding saturation pressures of water vapour are 3.0 kPa, 2.0 kPa and 1.5 kPa respectively. What will be the relative humidity of air ?
(a) 47% (b) 50% (c) 65% (d) None of these
Ans: B
46. In summer air-conditioning, the room is maintained at the following conditions :
(a) 21 °C DBT, 50% RH (b) 21 °C DBT, 60% RH (c) 25 °C DBT, 50% RH (d) 25 °C DBT, 60% RH
Ans: C
47. Which of the following is basically a polishing operation ?
(a) Soft grinding (b) Lapping (c) Honing (d) Buffing
Ans: D
48. The depth of cut depend on the
(a) cutting speed (b) tool material (c) rigidity of machine tool (d) All of these
Ans: D
49. The commonly used material for thermocouples is
(a) chromel – copper (b) chromel – alumel (c) platinum – rhodium (d) Any of these
Ans: D
50. The gases used in tungsten inert gas welding are
(a) helium and neon (b) argon and helium (c) ozone and neon (d) None of these
Ans: B
(a) 25% (b) 50% (c) 75% (d) 100%
Ans: B
41. The function of lubrication in engines are
(a) lubrication and cooling (b) cleaning, sealing and noise reduction (c) efficiency enhancement (d) both (a) and (b)
Ans: D
42. In which cycle, all the four processes are not reversible ?
(a) Carnot cycle (b) Joule cycle (c) Vapour compression cycle (d) None of these
Ans: C
43. Wet compression in vapour compression cycle means
(a) presence of water in refrigerant vapour during compression
(b) presence of liquid refrigerant in refrigerant vapour during compression
(c) compression of liquid refrigerant only
(d) compression of water only
Ans: B
44. In an ideal vapour absorption system, the absorber pressure is equal to the pressure of
(a) generator (b) condenser (c) evaporator (d) expansion device
Ans: C
45. A sample of moist air is at a DBT of 25 °C, WBT of 18 °C and DPT of 13 °C and corresponding saturation pressures of water vapour are 3.0 kPa, 2.0 kPa and 1.5 kPa respectively. What will be the relative humidity of air ?
(a) 47% (b) 50% (c) 65% (d) None of these
Ans: B
46. In summer air-conditioning, the room is maintained at the following conditions :
(a) 21 °C DBT, 50% RH (b) 21 °C DBT, 60% RH (c) 25 °C DBT, 50% RH (d) 25 °C DBT, 60% RH
Ans: C
47. Which of the following is basically a polishing operation ?
(a) Soft grinding (b) Lapping (c) Honing (d) Buffing
Ans: D
48. The depth of cut depend on the
(a) cutting speed (b) tool material (c) rigidity of machine tool (d) All of these
Ans: D
49. The commonly used material for thermocouples is
(a) chromel – copper (b) chromel – alumel (c) platinum – rhodium (d) Any of these
Ans: D
50. The gases used in tungsten inert gas welding are
(a) helium and neon (b) argon and helium (c) ozone and neon (d) None of these
Ans: B
51. The following is a vertical type boiler
(a) Lancashire boiler (b) Cornish boiler (c) Cochran boiler (d) Locomotive boiler
Ans: C
52. A boiler mounting used to put-off fire in the furnace when water level in the boiler falls below a safe limit :
(a) Blow off cock (b) Stop valve (c) Feed check valve (d) Fusible plug
Ans: D
53. In a Brayton cycle, the air enters the compressor at 300 °k and maximum temperature of cycle is 1200 °k. What will be the thermal efficiency of cycle for maximum power output ?
(a) 75% (b) 25% (c) 50% (d) None of these
Ans: C
54. The bottom ring on the piston is known as
(a) oil ring (b) scraper ring (c) compression ring (d) groove ring
Ans: A
55. A fly cutter is used on
(a) lathe (b) capstan lathe (c) metal spining lathe (d) milling machine
Ans: D
56. The flow rate through a circular pipe is measured by
(a) Pitot tube (b) Venturimeter (c) Orifice meter (d) both (b) and (c)
Ans: D
57. A pump is defined as a device which converts
(a) hydraulic energy into mechanical energy (b) mechanical energy into hydraulic energy
(c) kinetic energy into mechanical energy (d) None of the above
Ans: B
58. In an engine working on Otto cycle, air-fuel mixture is compressed from 400 C.C. to 100 C.C. If γ = 1.5, calculate the thermal efficiency of cycle.
(a) 50% (b) 55% (c) 68% (d) None of these
Ans: A
59. The engine part that joins piston and piston rod is called
(a) piston crown (b) piston ring (c) crank pin (d) gudgeon pin
Ans: D
60. The process of scavenging is related to
(a) two stroke engine (b) four stroke engine (c) gas turbine (d) compressor
Ans: A
61. The function of a regenerator in a gas turbine is to
(a) reduce heat loss in exhaust (b) permit use of higher compression ratio (c) improve thermal efficiency (d) None of these
Ans: C
(a) Lancashire boiler (b) Cornish boiler (c) Cochran boiler (d) Locomotive boiler
Ans: C
52. A boiler mounting used to put-off fire in the furnace when water level in the boiler falls below a safe limit :
(a) Blow off cock (b) Stop valve (c) Feed check valve (d) Fusible plug
Ans: D
53. In a Brayton cycle, the air enters the compressor at 300 °k and maximum temperature of cycle is 1200 °k. What will be the thermal efficiency of cycle for maximum power output ?
(a) 75% (b) 25% (c) 50% (d) None of these
Ans: C
54. The bottom ring on the piston is known as
(a) oil ring (b) scraper ring (c) compression ring (d) groove ring
Ans: A
55. A fly cutter is used on
(a) lathe (b) capstan lathe (c) metal spining lathe (d) milling machine
Ans: D
56. The flow rate through a circular pipe is measured by
(a) Pitot tube (b) Venturimeter (c) Orifice meter (d) both (b) and (c)
Ans: D
57. A pump is defined as a device which converts
(a) hydraulic energy into mechanical energy (b) mechanical energy into hydraulic energy
(c) kinetic energy into mechanical energy (d) None of the above
Ans: B
58. In an engine working on Otto cycle, air-fuel mixture is compressed from 400 C.C. to 100 C.C. If γ = 1.5, calculate the thermal efficiency of cycle.
(a) 50% (b) 55% (c) 68% (d) None of these
Ans: A
59. The engine part that joins piston and piston rod is called
(a) piston crown (b) piston ring (c) crank pin (d) gudgeon pin
Ans: D
60. The process of scavenging is related to
(a) two stroke engine (b) four stroke engine (c) gas turbine (d) compressor
Ans: A
61. The function of a regenerator in a gas turbine is to
(a) reduce heat loss in exhaust (b) permit use of higher compression ratio (c) improve thermal efficiency (d) None of these
Ans: C
62. The tool used in the shaper is a
(a) multipoint cutting tool (b) two point cutting tool (c) single point cutting tool (d) None of these
Ans: C
63. Welding used for production of high quality butt welds in thicker steel plates is
(a) resistance welding (b) gas welding (c) seam welding (d) submerged arc welding
Ans: D
64. Following is natural defect found in timbers :
(a) pitch (b) heart shakes (c) medulla (d) both (a) and (b)
Ans: D
65. The tool used for removing nails from wood is
(a) screw-driver (b) chisel (c) pincer (d) None of these
Ans: C
66. In gas welding, the following type of flame is used for welding brass, bronze and gold :
(a) neutral flame (b) reducing flame (c) oxidising flame (d) both neutral and reducing flames
Ans: C
67. For good permeability of moulding sand, the following is not a desirable characteristics :
(a) higher percentage of silica (b) larger grain size (c) lower silt percentage (d) sand mixture containing grains of all sizes
Ans: D
68. The correct sequence of processes for getting smooth surface is as follows : (I – Grinding, II – Honing, III – Burnishing, IV – Buffing)
(a) I → IV → II → III (b) I → II → III → IV (c) I → II → IV → III (d) I → IV → III → II
Ans: C
69. Following type of chip is produced while machining ductile metals with extreme pressure in cutting zone and high local temperature : (a) continuous chip (b) continuous chip with built up edge (c) discontinuous chip (d) discontinuous chip with built up edge
Ans: B
70. The following type of welding is used for joining rails and heavy pipes etc :
(a) laser beam welding (b) resistance welding (c) ultrasonic welding (d) thermit welding
Ans: D
71. Helix angle for most of the drills lies from
(a) 10° to 15° (b) 15° to 20° (c) 20° to 24° (d) 24° to 30°
Ans: D
72. Select the most appropriate alternative about cutting fluids.
(a) It reduces heat generation. (b) It wash away the chips from metal. (c) It reduces energy consumption. (d) All of these
Ans: D
73. Wet bulb depression is equal to
(a) WBT – DPT (b) DPT – WBT (c) DBT – DPT (d) DBT – WBT
Ans: D
74. Air washer is a plant used for
(a) cleaning air (b) washing air (c) year round air-conditioning (d) None of these
Ans: C
75. Solid solution of carbon in gamma iron is called
(a) austenite (b) sorbite (c) troostite (d) ferrite
Ans: A
76. Following is an inward mixed flow reaction turbine :
(a) Pelton turbine (b) Francis turbine (c) Kaplan turbine (d) None of these
Ans: B
77. Of the various methods of measuring discharge through a pipe line, the one with the least loss of energy and direct reading is by
(a) venturimeter (b) orifice meter (c) flow nozzle (d) traversing a pitot-static probe
Ans: A
78. A jet of water of 0.002 m2 area moving with a velocity of 15 m/s strikes on a series of blades moving with a velocity of 6 m/s. The force exerted on the blades will be
(a) 0.18 N (b) 270 N (c) 27 N (d) 180 N
Ans: B
79. If jet ratio of a Pelton turbine is 8, the number of buckets will be
(a) 8 (b) 23 (c) 19 (d) 31
Ans: C
80. A turbine is coupled with alternator to generate electricity. If number of pair of poles in alternator are 6 and the frequency of electricity is 50 Hz, what should be the speed of the turbine ?
(a) 250 rpm (b) 500 rpm (c) 1000 rpm (d) 3000 rpm
Ans: B
81. Following is not a characteristic of powder metallurgy :
(a) complex shapes can be produced (b) bimetallic and laminated parts can be made
(c) cost effectiveness (d) low production rates due to complex shapes
Ans: D
82. In Kaplan turbine, the number of blades is generally
(a) 2 to 4 (b) 4 to 8 (c) 8 to 16 (d) 16 to 24
Ans: B
83. If velocity of flow through a pipe is doubled, the head loss due to friction becomes
(a) two times (b) four times (c) eight times (d) half
Ans: B
84. If sensible heat load and latent heat load in a building are in the ratio 3:1, sensible heat factor will be
(a) 0.67 (b) 0.33 (c) 0.75 (d) 0.25
Ans: C
85. The centre of pressure of a plane submerged surface
(a) should coincide with centroid of surface (b) should coincide with centroid of pressure prism
(c) may be above or below centroid (d) cannot be above mentioned
Ans: D
86. Bernoulli’s equation can be derived from
(a) Continuity equation (b) Newton’s law of viscosity (c) Reynold transport theorem (d) Euler’s equation
Ans: D
87. If the level of water (H) above the base point of V notch is increased by four times, the discharge through the notch will become
(a) 4 times (b) 8 times (c) 16 times (d) 32 times
Ans: D
88. Uniform flow in a channel is characterized by
(a) the flow is uniform across the channel. (b) the total energy remains constant along the channel.
(c) specific energy remains constant along the channel. (d) total energy line either rises or falls depending on Froude number.
Ans: C
89. N.P.S.H. stands for
(a) Net Positive Supply Head (b) Net Power Supply Head (c) Net Positive Suction Height (d) Net Positive Suction Head
Ans: D
90. The process of increasing the thickness of a bar at the expense of its length is called
(a) drawing down (b) setting down (c) upsetting (d) None of these
Ans: C
91. The ratio of the Euler's buckling load of columns with same parameters having
(1) both end fixed and (2) both end hinged is
(A) 2 (B) 4 (C) 6 (D) 8
Ans: B
92. A 10 mm diameter aluminium alloy test bar is subjected to a load of 500 N. If the diameter of the bar at this load is 8 mm, the true strain is
(A) 0.2 (B) 0.25 (C) 0.22 (D) 0.1
Ans: B
93. When a ship travels in a sea, which of the effects is more dangerous?
(A) Steering (B) Pitching (C) Rolling (D) All of the above
Ans: B
94. Throw of a cam is the maximum distance of the follower from
(A) Base circle (B) Pitch circle (C) Root circle (D) Prime circle
Ans: A
95. Optical flats are made of
(A) Quartz (B) Glass (C) Steel (D) Plastic
Ans: A
96. External taper can be accurately measured with the help of
(A) Dividing head (B) Sine bar and slip gauge (C) Clinometers (D) Combination set
Ans: B
97. Sensitivity and range of measuring instrument have
(A) Direct relation (B) Linear relation (C) Inverse relationship (D) No relationship
Ans: C
98. For grade IT 7, value of tolerance is equal to
(A) 7i (B) 10i (C) 16i (D) 40i
Ans: C
99. Select the quantity in the following that is not a dimensionless parameter
(A) Froude number (B) Weber number (C) Kinematic viscosity (D) Pressure coefficient
Ans: C
100. In a flowing fluid, a particle may possess
(A) Inertial energy (B) Pressure energy (C) Kinetic energy (D) All of the above
Ans: D
(a) multipoint cutting tool (b) two point cutting tool (c) single point cutting tool (d) None of these
Ans: C
63. Welding used for production of high quality butt welds in thicker steel plates is
(a) resistance welding (b) gas welding (c) seam welding (d) submerged arc welding
Ans: D
64. Following is natural defect found in timbers :
(a) pitch (b) heart shakes (c) medulla (d) both (a) and (b)
Ans: D
65. The tool used for removing nails from wood is
(a) screw-driver (b) chisel (c) pincer (d) None of these
Ans: C
66. In gas welding, the following type of flame is used for welding brass, bronze and gold :
(a) neutral flame (b) reducing flame (c) oxidising flame (d) both neutral and reducing flames
Ans: C
67. For good permeability of moulding sand, the following is not a desirable characteristics :
(a) higher percentage of silica (b) larger grain size (c) lower silt percentage (d) sand mixture containing grains of all sizes
Ans: D
68. The correct sequence of processes for getting smooth surface is as follows : (I – Grinding, II – Honing, III – Burnishing, IV – Buffing)
(a) I → IV → II → III (b) I → II → III → IV (c) I → II → IV → III (d) I → IV → III → II
Ans: C
69. Following type of chip is produced while machining ductile metals with extreme pressure in cutting zone and high local temperature : (a) continuous chip (b) continuous chip with built up edge (c) discontinuous chip (d) discontinuous chip with built up edge
Ans: B
70. The following type of welding is used for joining rails and heavy pipes etc :
(a) laser beam welding (b) resistance welding (c) ultrasonic welding (d) thermit welding
Ans: D
71. Helix angle for most of the drills lies from
(a) 10° to 15° (b) 15° to 20° (c) 20° to 24° (d) 24° to 30°
Ans: D
72. Select the most appropriate alternative about cutting fluids.
(a) It reduces heat generation. (b) It wash away the chips from metal. (c) It reduces energy consumption. (d) All of these
Ans: D
73. Wet bulb depression is equal to
(a) WBT – DPT (b) DPT – WBT (c) DBT – DPT (d) DBT – WBT
Ans: D
74. Air washer is a plant used for
(a) cleaning air (b) washing air (c) year round air-conditioning (d) None of these
Ans: C
75. Solid solution of carbon in gamma iron is called
(a) austenite (b) sorbite (c) troostite (d) ferrite
Ans: A
76. Following is an inward mixed flow reaction turbine :
(a) Pelton turbine (b) Francis turbine (c) Kaplan turbine (d) None of these
Ans: B
77. Of the various methods of measuring discharge through a pipe line, the one with the least loss of energy and direct reading is by
(a) venturimeter (b) orifice meter (c) flow nozzle (d) traversing a pitot-static probe
Ans: A
78. A jet of water of 0.002 m2 area moving with a velocity of 15 m/s strikes on a series of blades moving with a velocity of 6 m/s. The force exerted on the blades will be
(a) 0.18 N (b) 270 N (c) 27 N (d) 180 N
Ans: B
79. If jet ratio of a Pelton turbine is 8, the number of buckets will be
(a) 8 (b) 23 (c) 19 (d) 31
Ans: C
80. A turbine is coupled with alternator to generate electricity. If number of pair of poles in alternator are 6 and the frequency of electricity is 50 Hz, what should be the speed of the turbine ?
(a) 250 rpm (b) 500 rpm (c) 1000 rpm (d) 3000 rpm
Ans: B
81. Following is not a characteristic of powder metallurgy :
(a) complex shapes can be produced (b) bimetallic and laminated parts can be made
(c) cost effectiveness (d) low production rates due to complex shapes
Ans: D
82. In Kaplan turbine, the number of blades is generally
(a) 2 to 4 (b) 4 to 8 (c) 8 to 16 (d) 16 to 24
Ans: B
83. If velocity of flow through a pipe is doubled, the head loss due to friction becomes
(a) two times (b) four times (c) eight times (d) half
Ans: B
84. If sensible heat load and latent heat load in a building are in the ratio 3:1, sensible heat factor will be
(a) 0.67 (b) 0.33 (c) 0.75 (d) 0.25
Ans: C
85. The centre of pressure of a plane submerged surface
(a) should coincide with centroid of surface (b) should coincide with centroid of pressure prism
(c) may be above or below centroid (d) cannot be above mentioned
Ans: D
86. Bernoulli’s equation can be derived from
(a) Continuity equation (b) Newton’s law of viscosity (c) Reynold transport theorem (d) Euler’s equation
Ans: D
87. If the level of water (H) above the base point of V notch is increased by four times, the discharge through the notch will become
(a) 4 times (b) 8 times (c) 16 times (d) 32 times
Ans: D
88. Uniform flow in a channel is characterized by
(a) the flow is uniform across the channel. (b) the total energy remains constant along the channel.
(c) specific energy remains constant along the channel. (d) total energy line either rises or falls depending on Froude number.
Ans: C
89. N.P.S.H. stands for
(a) Net Positive Supply Head (b) Net Power Supply Head (c) Net Positive Suction Height (d) Net Positive Suction Head
Ans: D
90. The process of increasing the thickness of a bar at the expense of its length is called
(a) drawing down (b) setting down (c) upsetting (d) None of these
Ans: C
91. The ratio of the Euler's buckling load of columns with same parameters having
(1) both end fixed and (2) both end hinged is
(A) 2 (B) 4 (C) 6 (D) 8
Ans: B
92. A 10 mm diameter aluminium alloy test bar is subjected to a load of 500 N. If the diameter of the bar at this load is 8 mm, the true strain is
(A) 0.2 (B) 0.25 (C) 0.22 (D) 0.1
Ans: B
93. When a ship travels in a sea, which of the effects is more dangerous?
(A) Steering (B) Pitching (C) Rolling (D) All of the above
Ans: B
94. Throw of a cam is the maximum distance of the follower from
(A) Base circle (B) Pitch circle (C) Root circle (D) Prime circle
Ans: A
95. Optical flats are made of
(A) Quartz (B) Glass (C) Steel (D) Plastic
Ans: A
96. External taper can be accurately measured with the help of
(A) Dividing head (B) Sine bar and slip gauge (C) Clinometers (D) Combination set
Ans: B
97. Sensitivity and range of measuring instrument have
(A) Direct relation (B) Linear relation (C) Inverse relationship (D) No relationship
Ans: C
98. For grade IT 7, value of tolerance is equal to
(A) 7i (B) 10i (C) 16i (D) 40i
Ans: C
99. Select the quantity in the following that is not a dimensionless parameter
(A) Froude number (B) Weber number (C) Kinematic viscosity (D) Pressure coefficient
Ans: C
100. In a flowing fluid, a particle may possess
(A) Inertial energy (B) Pressure energy (C) Kinetic energy (D) All of the above
Ans: D
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