MECHANICAL ENGINEERING- PAGE 6
Mechanical Engineering MCQs- Page 6
1. Air velocity is measured by __________.
(A) Tachometer (B) Anemometer
(C) Hydrometer (D) Thermometer
Ans: B
2. The solenoid valve operated by __________.
(A) Hand operated (B) Oil pressure operated
(C) Gas pressure operated (D) Electrically operated
Ans: D
3. Brine solution circulation pump consists of __________.
(A) Piston type (B) Gear type
(C) Rotary type (D) Rotating vane type impeller
Ans: D
4. A water cooler is having 4 kg (weight) quantity of R-12, if you retrofit with HFC for the same machine. How much quantity is weight of 134a you will charge ?
(A) 3.8 kgs. (B) 3.2 kgs.
(C) 2.4 kgs. (D) 1.6 kgs.
Ans: A
5. Ice cream storage plant thermostat thermal bulb is located ________.
(A) near suction line (B) at liquid line
(C) inside the storage compartment (D) in brine solution
Ans: D
6. The function of duct in air conditioning unit is _________
(A) Air cooling (B) Air cleaning
(C) Air drying (D) Air distributing
Ans: D
7. A cooling tower’s warm water inlet temperature is 44 C, sump water outlet temperature is 32 C, surrounding air wet bulb temperature is 24 C. Find out the efficiency of the cooling tower in percentage. (
A) 60% (B) 40% (C) 80% (D) 75%
Ans: A
8. The cut-in and cut-out set pressure difference is called
(A) set pressure (B) differential pressure (C) cut-out pressure (D) cut-in pressure
Ans: B
9. Compressor motor protected by the ___________.
(A) low pressure switch (B) overload protector (C) high pressure switch (D) temperature control
Ans: B
10. The purified, conditioned air improves the ___________.
(A) Breathing of human (B) Cleaning of AC room (C) Performance of the system (D) Quality of the air filters
Ans: C
11. Which instrument is used to measure relative humidity ?
(A) Hydrometer (B) Psychrometer (C) Hygrometer (D) Thermometer
Ans: B
12. What is the purity of dry nitrogen for flushing ?
(A) 10 ppm (B) 15 ppm (C) 3 ppm (D) 8 ppm
Ans: C
13. By using which valve in the charging line, the refrigerant can be recovered ?
(A) Service valve (B) Hand shut off valve (C) Piercing valve (D) Double stage regulator
Ans: C
14. The relationship between rotor speed ‘N’, frequency ‘f’ and number of poles ‘p’ is given by relation
(A) N = 120 f/p (B) PN = 120/p (C) f = 120 N/p (D) N = 120 p/f
Ans: A
15. A oil separator is necessary in discharge line to return the oil to the compressor in case of ______ (
A) R-290 (B) R-717 (C) R-12 (D) R-600a
Ans: B
16. An evaporative condenser is a _________.
(A) Air cooled condenser (B) Water cooled condenser (C) Both air and water cooled at the same time (D) None of these
Ans: C
17. Approach of a cooling tower is defined as the
(A) difference of dry bulb temperature of surrounding air and temperature of water leaving the cooling tower.
(B) difference of temperature of water leaving the cooling tower and wet bulb temperature of surrounding air.
(C) difference of temperature of water leaving the cooling tower and temperature of water entering the cooling tower.
(D) None of the above
Ans: C
18. In a induced draft cooling tower, the fan is fixed at the _________.
(A) top of the cooling tower (B) middle of the cooling tower (C) bottom of the cooling tower (D) any location of the cooling tower
Ans: A
19. A thermostatic expansion valve is based on the principle of maintaining a constant degree of superheat at the _________. (
A) discharge of compressor (B) exit of the condenser (C) exit of capillary tube (D) exit of evaporator
Ans: D
20. The eliminators at the air washers avoid the
(A) Air flow (B) Water particles in the air (C) Water flow (D) Dehumidification
Ans: B
(A) Tachometer (B) Anemometer
(C) Hydrometer (D) Thermometer
Ans: B
2. The solenoid valve operated by __________.
(A) Hand operated (B) Oil pressure operated
(C) Gas pressure operated (D) Electrically operated
Ans: D
3. Brine solution circulation pump consists of __________.
(A) Piston type (B) Gear type
(C) Rotary type (D) Rotating vane type impeller
Ans: D
4. A water cooler is having 4 kg (weight) quantity of R-12, if you retrofit with HFC for the same machine. How much quantity is weight of 134a you will charge ?
(A) 3.8 kgs. (B) 3.2 kgs.
(C) 2.4 kgs. (D) 1.6 kgs.
Ans: A
5. Ice cream storage plant thermostat thermal bulb is located ________.
(A) near suction line (B) at liquid line
(C) inside the storage compartment (D) in brine solution
Ans: D
6. The function of duct in air conditioning unit is _________
(A) Air cooling (B) Air cleaning
(C) Air drying (D) Air distributing
Ans: D
7. A cooling tower’s warm water inlet temperature is 44 C, sump water outlet temperature is 32 C, surrounding air wet bulb temperature is 24 C. Find out the efficiency of the cooling tower in percentage. (
A) 60% (B) 40% (C) 80% (D) 75%
Ans: A
8. The cut-in and cut-out set pressure difference is called
(A) set pressure (B) differential pressure (C) cut-out pressure (D) cut-in pressure
Ans: B
9. Compressor motor protected by the ___________.
(A) low pressure switch (B) overload protector (C) high pressure switch (D) temperature control
Ans: B
10. The purified, conditioned air improves the ___________.
(A) Breathing of human (B) Cleaning of AC room (C) Performance of the system (D) Quality of the air filters
Ans: C
11. Which instrument is used to measure relative humidity ?
(A) Hydrometer (B) Psychrometer (C) Hygrometer (D) Thermometer
Ans: B
12. What is the purity of dry nitrogen for flushing ?
(A) 10 ppm (B) 15 ppm (C) 3 ppm (D) 8 ppm
Ans: C
13. By using which valve in the charging line, the refrigerant can be recovered ?
(A) Service valve (B) Hand shut off valve (C) Piercing valve (D) Double stage regulator
Ans: C
14. The relationship between rotor speed ‘N’, frequency ‘f’ and number of poles ‘p’ is given by relation
(A) N = 120 f/p (B) PN = 120/p (C) f = 120 N/p (D) N = 120 p/f
Ans: A
15. A oil separator is necessary in discharge line to return the oil to the compressor in case of ______ (
A) R-290 (B) R-717 (C) R-12 (D) R-600a
Ans: B
16. An evaporative condenser is a _________.
(A) Air cooled condenser (B) Water cooled condenser (C) Both air and water cooled at the same time (D) None of these
Ans: C
17. Approach of a cooling tower is defined as the
(A) difference of dry bulb temperature of surrounding air and temperature of water leaving the cooling tower.
(B) difference of temperature of water leaving the cooling tower and wet bulb temperature of surrounding air.
(C) difference of temperature of water leaving the cooling tower and temperature of water entering the cooling tower.
(D) None of the above
Ans: C
18. In a induced draft cooling tower, the fan is fixed at the _________.
(A) top of the cooling tower (B) middle of the cooling tower (C) bottom of the cooling tower (D) any location of the cooling tower
Ans: A
19. A thermostatic expansion valve is based on the principle of maintaining a constant degree of superheat at the _________. (
A) discharge of compressor (B) exit of the condenser (C) exit of capillary tube (D) exit of evaporator
Ans: D
20. The eliminators at the air washers avoid the
(A) Air flow (B) Water particles in the air (C) Water flow (D) Dehumidification
Ans: B
21. What thickness of metal sheets are called as plates ?
(A) Above 3 mm (B) Above 5 mm (C) Above 7 mm (D) Above 10 mm
Ans: B
22. What gases are used for the application under water gas cutting of steel ?
(A) Oxygen-coal (B) Oxygen-LPG (C) Oxygen-Hydrogen (D) Oxygen-Acetylene
Ans: C
23. In which gas welding technique the blow pipe and filler rod angles are 50 and 40 respectively with the welding line ?
(A) Rightward (B) Leftward (C) Rightward and Leftward (D) All of these
Ans: A
24. Soldering & Brazing are the example of non-fusion welding
(A) Fusion welding (B) Non-fusion welding (C) Pressure welding (D) Forge welding
Ans: B
25. Which type of artificial respiration method must not be used for the victim has injuries to the chest and belly ?
(A) Mouth to mouth method (B) Schafer’s method (C) Nelson’s arm – lift back – pressure method (D) Mouth to nose method
Ans: C
26. Metering device used in car air-conditioner
(A) Electronic expansion valve (B) Automatic expansion valve (C) Capillary tube (D) Thermostatic expansion valve
Ans: D
27. VRV stands for _________
(A) Varying Recirculated Volume (B) Variable Refrigerant Volume (C) Varying Refrigerant Volume (D) None of these
Ans: B
28. The package AC comes in capacity _________.
(A) less than 2 TR (B) between 2 to 4 TR (C) between 5 to 15 TR (D) more than 25 TR
Ans: C
29. Rawl plug tool is used for making _________.
(A) Bending (B) Grinding (C) Cutting (D) Hole
Ans: D
30. Commercial reciprocating compressor lubricated by
(A) Forced feed (B) Splash lubrication (C) Machine lubrication (D) None of the above
Ans: A
31. Centrifugal switch disconnected after the rotor has reached _________ of the rated speed.
(A) 50 to 55% (B) 55 to 60% (C) 70 to 75% (D) 75 to 80%
Ans: D
32. Why is three phase induction motor self starting ?
(A) phase angle difference 60 (B) phase angle difference 180 (C) phase angle difference 90 (D) phase angle difference 120
Ans: D
33. Standard atmospheric pressure is
(A) 1.0332 kg f/sq.cm. (B) 1.332 kg f/sq.cm. (C) 2.0332 kg f/sq.cm. (D) All the above
Ans: A
34. Chemical formulae of R-600 a
(A) C5H12 (B) C2H6 (C) C3H8 (D) C4H10
Ans: D
35. High pressure cut off is used to __________
(A) cut off power supply to condenser fan motor if pressure increases beyond the preset value. (B) cut off power supply to compressor motor if pressure increases beyond the preset value.
(C) cut off power supply to evaporator fan motor if pressure increases beyond the preset value.
(D) None of these
Ans: B
36. What is the colour code of Refrigerant 410 A ?
(A) Rose (B) Orange (C) Chocolate Brown (D) Coral Red
Ans: A
37. The various methods of duct design are _________
(A) Equal friction method (B) Velocity reduction method (C) Static regain method (D) All of these
Ans: D
38. ‘HEPA’ stands for _________.
(A) High Energy Particulate Air (B) High Efficiency Particulate Air (C) High Entry Particulate Air (D) Highly Effective Pressurized Air
Ans: B
39. As the engine speed decreases, the cooling capacity of the car AC system _________.
(A) increases (B) remains unchanged (C) decreases (D) may increase or decrease depending on number of persons travelling in car
Ans: C
40. Refrigerant 407 C is combination of _________.
(A) R-290 & R-1270 (B) R-600a & R-134a (C) R-125, R-600 & R-134a (D) R-32, R-125 & R-134a
Ans: D
(A) Above 3 mm (B) Above 5 mm (C) Above 7 mm (D) Above 10 mm
Ans: B
22. What gases are used for the application under water gas cutting of steel ?
(A) Oxygen-coal (B) Oxygen-LPG (C) Oxygen-Hydrogen (D) Oxygen-Acetylene
Ans: C
23. In which gas welding technique the blow pipe and filler rod angles are 50 and 40 respectively with the welding line ?
(A) Rightward (B) Leftward (C) Rightward and Leftward (D) All of these
Ans: A
24. Soldering & Brazing are the example of non-fusion welding
(A) Fusion welding (B) Non-fusion welding (C) Pressure welding (D) Forge welding
Ans: B
25. Which type of artificial respiration method must not be used for the victim has injuries to the chest and belly ?
(A) Mouth to mouth method (B) Schafer’s method (C) Nelson’s arm – lift back – pressure method (D) Mouth to nose method
Ans: C
26. Metering device used in car air-conditioner
(A) Electronic expansion valve (B) Automatic expansion valve (C) Capillary tube (D) Thermostatic expansion valve
Ans: D
27. VRV stands for _________
(A) Varying Recirculated Volume (B) Variable Refrigerant Volume (C) Varying Refrigerant Volume (D) None of these
Ans: B
28. The package AC comes in capacity _________.
(A) less than 2 TR (B) between 2 to 4 TR (C) between 5 to 15 TR (D) more than 25 TR
Ans: C
29. Rawl plug tool is used for making _________.
(A) Bending (B) Grinding (C) Cutting (D) Hole
Ans: D
30. Commercial reciprocating compressor lubricated by
(A) Forced feed (B) Splash lubrication (C) Machine lubrication (D) None of the above
Ans: A
31. Centrifugal switch disconnected after the rotor has reached _________ of the rated speed.
(A) 50 to 55% (B) 55 to 60% (C) 70 to 75% (D) 75 to 80%
Ans: D
32. Why is three phase induction motor self starting ?
(A) phase angle difference 60 (B) phase angle difference 180 (C) phase angle difference 90 (D) phase angle difference 120
Ans: D
33. Standard atmospheric pressure is
(A) 1.0332 kg f/sq.cm. (B) 1.332 kg f/sq.cm. (C) 2.0332 kg f/sq.cm. (D) All the above
Ans: A
34. Chemical formulae of R-600 a
(A) C5H12 (B) C2H6 (C) C3H8 (D) C4H10
Ans: D
35. High pressure cut off is used to __________
(A) cut off power supply to condenser fan motor if pressure increases beyond the preset value. (B) cut off power supply to compressor motor if pressure increases beyond the preset value.
(C) cut off power supply to evaporator fan motor if pressure increases beyond the preset value.
(D) None of these
Ans: B
36. What is the colour code of Refrigerant 410 A ?
(A) Rose (B) Orange (C) Chocolate Brown (D) Coral Red
Ans: A
37. The various methods of duct design are _________
(A) Equal friction method (B) Velocity reduction method (C) Static regain method (D) All of these
Ans: D
38. ‘HEPA’ stands for _________.
(A) High Energy Particulate Air (B) High Efficiency Particulate Air (C) High Entry Particulate Air (D) Highly Effective Pressurized Air
Ans: B
39. As the engine speed decreases, the cooling capacity of the car AC system _________.
(A) increases (B) remains unchanged (C) decreases (D) may increase or decrease depending on number of persons travelling in car
Ans: C
40. Refrigerant 407 C is combination of _________.
(A) R-290 & R-1270 (B) R-600a & R-134a (C) R-125, R-600 & R-134a (D) R-32, R-125 & R-134a
Ans: D
41. What is temperature of Neutral flame in Oxy-Acetylene Brazing set ?
(A) 2200 C (B) 3200 C (C) 4200 C (D) 5200 C
Ans: B
42. 1 micron = _________ millimetre of Hg.
(A) 1/100 (B) 1/1000 (C) 1/10000 (D) 1/10
Ans: B
43. Azeotropic Mixtures are designed by _________ series.
(A) 500 (B) 400 (C) 700 (D) 600
Ans: A
44. How are the reciprocating compressor classified depending on working ?
(A) Vertical & Horizontal (B) Single & Double acting (C) Open type & Semi sealed (D) Semi & Hermetically sealed
Ans: B
45. GWP of R-11 is
(A) 8500 (B) 5400 (C) 4500 (D) 1800
Ans: A
46. How much air is normally required for the working of air-cooled condenser per ton of refrigeration ?
(A) 50 to 55 cu.m/min. (B) 30 to 35 cu.m/min. (C) 20 to 25 cu.m/min. (D) 60 to 65 cu.m/min.
Ans: B
47. The thermistors are _________
(A) pressure type temperature sensors (B) bellow type temperature sensors (C) resistance type temperature sensors (D) all of the above
Ans: C
48. What are the examples of non-fusion welding ?
(A) Arc welding (B) Oxy-Acetylene welding (C) Soldering (D) None of the above
Ans: C
49. Alternative refrigerant of R-22
(A) R-401 A (B) R-410 A (C) R-500 (D) R-507
Ans: B
50. Voltage rating of starting capacitor used in ACs
(A) 410 V (B) 230 V (C) 440 V (D) 110 V
Ans: B
51. 50 F is _________
(A) 12.5 C (B) 5 C (C) 7.5 C (D) 10 C
Ans: D
52. What is a Rectifier ?
(A) DC to AC converter (B) AC to DC converter (C) Both (A) and (B) possible (D) None of these
Ans: B
53. What is the voltage required for LED ?
(A) 1.2 – 2.5 V (B) 2.2 – 3.5 V (C) 3.2 – 4.5 V (D) 4.2 – 5.5 V
Ans: A
54. How many diodes are there in a bridge rectifier ?
(A) 2 (B) 3 (C) 4 (D) 6
Ans: C
55. Which is the semi-conductor device with three terminals and used for amplifying electric and electronic signals ?
(A) Diode (B) Transistor (C) Capacitor (D) Zener diode
Ans: B
56. What type of relay is used in RSIR ?
(A) Voltage type relay (B) Hotwire relay (C) PTC relay (D) Current coil relay
Ans: D
57. The vapour pressure of refrigerant should be
(A) lower than atmospheric pressure (B) higher than atmospheric pressure (C) equal to atmospheric pressure (D) none of the above
Ans: B
58. One of the purposes of sub-cooling the liquid refrigerant is to
(A) reduce compressor over-heating
(B) reduce compressor discharge temperature
(C) increase cooling effect
(D) ensure that only liquid and not the vapour enters the expansion valve
Ans: D
59. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
(A) decreases (B) increases (C) remains same (D) depends on other factors
Ans: B
60. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made up of
(A) Copper (B) Steel (C) Aluminium (D) Brass
Ans: B
61. The higher temperature in vapour compression cycle occurs at __________.
(A) Receiver (B) Expansion valve (C) Condenser discharge (D) Compressor discharge
Ans: D
62. Latent heat of vaporization at 5 F (Btu/lb) of R-134 a is __________.
(A) 66.2 (B) 99.2 (C) 103.3 (D) 89.3
Ans: D
63. The weight of HC charged to the system for drop in conversion from CFC 12 to HC is
(A) 120% (B) 100% (C) 60% (D) 40%
Ans: D
64. Most of the refrigerants including CFCs, HCFcs, HFCs and HC blend are __________.
(A) Non-toxic (B) Corrosive (C) High density (D) Non-flammable
Ans: A
65. A refrigerant recovery unit needs the filter drier change, approximately after __________.
(A) 50 to 60 hours of operation (B) 100 hours of operation (C) every 24 hours (D) every time before recover refrigerants
Ans: B
66. The clearance between rotor and stator varies according to the __________.
(A) Coil of the motor (B) Air passage (C) Cable size (D) Size of the motor
Ans: D
67. The ball bearing of electrical motor are lubricated by __________.
(A) Oil (B) Grease (C) Air (D) Water
Ans: B
68. Which causes clogging at the expansion valve ?
(A) Oil (B) Dust particles (C) Moisture (D) Impurities
Ans: C
69. The reason for the thermostat switch to become defective is __________.
(A) Moisture in the system (B) Lack of lubrication oil to compressor (C) Carbon formation of contact points (D) OLP is not functioning
Ans: C
(A) 2200 C (B) 3200 C (C) 4200 C (D) 5200 C
Ans: B
42. 1 micron = _________ millimetre of Hg.
(A) 1/100 (B) 1/1000 (C) 1/10000 (D) 1/10
Ans: B
43. Azeotropic Mixtures are designed by _________ series.
(A) 500 (B) 400 (C) 700 (D) 600
Ans: A
44. How are the reciprocating compressor classified depending on working ?
(A) Vertical & Horizontal (B) Single & Double acting (C) Open type & Semi sealed (D) Semi & Hermetically sealed
Ans: B
45. GWP of R-11 is
(A) 8500 (B) 5400 (C) 4500 (D) 1800
Ans: A
46. How much air is normally required for the working of air-cooled condenser per ton of refrigeration ?
(A) 50 to 55 cu.m/min. (B) 30 to 35 cu.m/min. (C) 20 to 25 cu.m/min. (D) 60 to 65 cu.m/min.
Ans: B
47. The thermistors are _________
(A) pressure type temperature sensors (B) bellow type temperature sensors (C) resistance type temperature sensors (D) all of the above
Ans: C
48. What are the examples of non-fusion welding ?
(A) Arc welding (B) Oxy-Acetylene welding (C) Soldering (D) None of the above
Ans: C
49. Alternative refrigerant of R-22
(A) R-401 A (B) R-410 A (C) R-500 (D) R-507
Ans: B
50. Voltage rating of starting capacitor used in ACs
(A) 410 V (B) 230 V (C) 440 V (D) 110 V
Ans: B
51. 50 F is _________
(A) 12.5 C (B) 5 C (C) 7.5 C (D) 10 C
Ans: D
52. What is a Rectifier ?
(A) DC to AC converter (B) AC to DC converter (C) Both (A) and (B) possible (D) None of these
Ans: B
53. What is the voltage required for LED ?
(A) 1.2 – 2.5 V (B) 2.2 – 3.5 V (C) 3.2 – 4.5 V (D) 4.2 – 5.5 V
Ans: A
54. How many diodes are there in a bridge rectifier ?
(A) 2 (B) 3 (C) 4 (D) 6
Ans: C
55. Which is the semi-conductor device with three terminals and used for amplifying electric and electronic signals ?
(A) Diode (B) Transistor (C) Capacitor (D) Zener diode
Ans: B
56. What type of relay is used in RSIR ?
(A) Voltage type relay (B) Hotwire relay (C) PTC relay (D) Current coil relay
Ans: D
57. The vapour pressure of refrigerant should be
(A) lower than atmospheric pressure (B) higher than atmospheric pressure (C) equal to atmospheric pressure (D) none of the above
Ans: B
58. One of the purposes of sub-cooling the liquid refrigerant is to
(A) reduce compressor over-heating
(B) reduce compressor discharge temperature
(C) increase cooling effect
(D) ensure that only liquid and not the vapour enters the expansion valve
Ans: D
59. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
(A) decreases (B) increases (C) remains same (D) depends on other factors
Ans: B
60. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made up of
(A) Copper (B) Steel (C) Aluminium (D) Brass
Ans: B
61. The higher temperature in vapour compression cycle occurs at __________.
(A) Receiver (B) Expansion valve (C) Condenser discharge (D) Compressor discharge
Ans: D
62. Latent heat of vaporization at 5 F (Btu/lb) of R-134 a is __________.
(A) 66.2 (B) 99.2 (C) 103.3 (D) 89.3
Ans: D
63. The weight of HC charged to the system for drop in conversion from CFC 12 to HC is
(A) 120% (B) 100% (C) 60% (D) 40%
Ans: D
64. Most of the refrigerants including CFCs, HCFcs, HFCs and HC blend are __________.
(A) Non-toxic (B) Corrosive (C) High density (D) Non-flammable
Ans: A
65. A refrigerant recovery unit needs the filter drier change, approximately after __________.
(A) 50 to 60 hours of operation (B) 100 hours of operation (C) every 24 hours (D) every time before recover refrigerants
Ans: B
66. The clearance between rotor and stator varies according to the __________.
(A) Coil of the motor (B) Air passage (C) Cable size (D) Size of the motor
Ans: D
67. The ball bearing of electrical motor are lubricated by __________.
(A) Oil (B) Grease (C) Air (D) Water
Ans: B
68. Which causes clogging at the expansion valve ?
(A) Oil (B) Dust particles (C) Moisture (D) Impurities
Ans: C
69. The reason for the thermostat switch to become defective is __________.
(A) Moisture in the system (B) Lack of lubrication oil to compressor (C) Carbon formation of contact points (D) OLP is not functioning
Ans: C
70. Reamer should always be rotated in __________ direction.
(A) Clockwise (B) Anticlockwise
(C) Clockwise and Anticlockwise (D) None of the above
Ans: A
71. Which metal is more ductile ?
(A) Mild steel (B) Copper (C) Cast iron (D) Gun metal
Ans: B
72. Rough hole in drilling is due to __________.
(A) Spindle running out of centre (B) Drill point is not sharp
(C) Feed rate is very high (D) Unequal length of cutting lips
Ans: C
73. The ore of Lead is __________.
(A) Galena (B) Boxite (C) Iron pyrites (D) Copper pyrites
Ans: A
74. Example of natural abrasive :
(A) Aluminium oxide (B) Silicon carbide
(C) Emery (D) Boron carbide
Ans: C
75. The relationship between two matting parts a hole and a shaft is __________.
(A) Limit (B) Fit (C) Tolerance (D) Deviation
Ans: B
76. Which one of the following metal has less carbon content ?
(A) Cast iron (B) Pig iron
(C) Plain carbon steel (D) Wrought iron
Ans: D
77. In the BIS System there are __________ fundamental deviations.
(A) 18 (B) 25 (C) 16 (D) 20
Ans: B
78. Which one of the following key used in automobile shaft ?
(A) Gib head key (B) Taper key
(C) Wood ruff key (D) Hollow saddle key
Ans: C
79. Centre drill is used for :
(A) Counter boring (B) Counter sinking (C) Boring (D) Deburring
Ans: B
80. Bending of sheets from end is called _________.
(A) Seam (B) Soldering (C) Hem (D) Grooving
Ans: C
81. Shear is the tool used for __________ operation.
(A) Bending (B) Cutting (C) Forging (D) Twisting
Ans: B
82. The Head of the hammer parallel to its handle is :
(A) Cross peen hammer (B) Ball peen hammer
(C) Straight peen hammer (D) None of these
Ans: C
83. Stake is a __________ tool.
(A) Measurement (B) Cutting (C) Supporting (D) Bending
Ans: C
84. __________ is used to improve internal structure of steel.
(A) Hardening (B) Normalizing (C) Annealing (D) Tempering
Ans: B
85. In a grinding wheel the difference between abrasive and bond is known as :
(A) Grit (B) Bond (C) Grid (D) Structure
Ans: D
86. Silicate bond is represented by __________ letter.
(A) V (B) R (C) S (D) E
Ans: C
87. According to Indian standard pipe is specified by __________.
(A) Outside diameter (B) Inside diameter
(C) Both internal and external (D) None of these
Ans: B
88. Datum line is called :
(A) Centre line (B) Base line (C) Curve line (D) Dotted line
Ans: B
89. Metal used for Bearing is :
(A) Aluminium (B) Brass (C) Gun metal (D) Cast iron
Ans: C
90. For radius cutting __________ saw is used.
(A) Reciprocating (B) Horizontal (C) Contour (D) None of these
Ans: C
91. In railway carriage coupling __________ is used.
(A) Buttress thread (B) Knuckle thread (C) Acme thread (D) Square thread
Ans: B
92. The bottom surface joining the two sides of thread is called __________.
(A) Root (B) Pitch (C) Crest (D) Lead
Ans: A
93. These files are known as fish back file :
(A) Crossing file (B) Barrette file (C) Tinkers file (D) Block file
Ans: B
94. Which method is used for bright finishing of cylindrical surface ?
(A) Spot facing (B) Lapping (C) Honing (D) Reaming
Ans: C
95. This clutch is used in two wheelers :
(A) Dog clutch (B) Centrifugal clutch
(C) Conical clutch (D) Magnetic clutch
Ans: B
96. Knuckle thread is a modified form of __________.
(A) Acme thread (B) V thread (C) Square thread (D) Sawtooth thread
Ans: C
97. __________ is used to power transmission between shaft at various angles.
(A) Spur gear (B) Bevel gear
(C) Helical gear (D) Worm and Shaft gear
Ans: B
98. In a Vernier Caliper the value of one main scale division is __________.
(A) 0.02 mm (B) 0.5 mm (C) 0.01 mm (D) 1 mm
Ans: D
99. Chain slings are used for :
(A) Light load (B) Heavy load (C) Medium load (D) None of these
Ans: B
100. The standard length of GI pipe is __________.
(A) 6 m (B) 5 m (C) 10 m (D) 4 m
Ans: A
(A) Clockwise (B) Anticlockwise
(C) Clockwise and Anticlockwise (D) None of the above
Ans: A
71. Which metal is more ductile ?
(A) Mild steel (B) Copper (C) Cast iron (D) Gun metal
Ans: B
72. Rough hole in drilling is due to __________.
(A) Spindle running out of centre (B) Drill point is not sharp
(C) Feed rate is very high (D) Unequal length of cutting lips
Ans: C
73. The ore of Lead is __________.
(A) Galena (B) Boxite (C) Iron pyrites (D) Copper pyrites
Ans: A
74. Example of natural abrasive :
(A) Aluminium oxide (B) Silicon carbide
(C) Emery (D) Boron carbide
Ans: C
75. The relationship between two matting parts a hole and a shaft is __________.
(A) Limit (B) Fit (C) Tolerance (D) Deviation
Ans: B
76. Which one of the following metal has less carbon content ?
(A) Cast iron (B) Pig iron
(C) Plain carbon steel (D) Wrought iron
Ans: D
77. In the BIS System there are __________ fundamental deviations.
(A) 18 (B) 25 (C) 16 (D) 20
Ans: B
78. Which one of the following key used in automobile shaft ?
(A) Gib head key (B) Taper key
(C) Wood ruff key (D) Hollow saddle key
Ans: C
79. Centre drill is used for :
(A) Counter boring (B) Counter sinking (C) Boring (D) Deburring
Ans: B
80. Bending of sheets from end is called _________.
(A) Seam (B) Soldering (C) Hem (D) Grooving
Ans: C
81. Shear is the tool used for __________ operation.
(A) Bending (B) Cutting (C) Forging (D) Twisting
Ans: B
82. The Head of the hammer parallel to its handle is :
(A) Cross peen hammer (B) Ball peen hammer
(C) Straight peen hammer (D) None of these
Ans: C
83. Stake is a __________ tool.
(A) Measurement (B) Cutting (C) Supporting (D) Bending
Ans: C
84. __________ is used to improve internal structure of steel.
(A) Hardening (B) Normalizing (C) Annealing (D) Tempering
Ans: B
85. In a grinding wheel the difference between abrasive and bond is known as :
(A) Grit (B) Bond (C) Grid (D) Structure
Ans: D
86. Silicate bond is represented by __________ letter.
(A) V (B) R (C) S (D) E
Ans: C
87. According to Indian standard pipe is specified by __________.
(A) Outside diameter (B) Inside diameter
(C) Both internal and external (D) None of these
Ans: B
88. Datum line is called :
(A) Centre line (B) Base line (C) Curve line (D) Dotted line
Ans: B
89. Metal used for Bearing is :
(A) Aluminium (B) Brass (C) Gun metal (D) Cast iron
Ans: C
90. For radius cutting __________ saw is used.
(A) Reciprocating (B) Horizontal (C) Contour (D) None of these
Ans: C
91. In railway carriage coupling __________ is used.
(A) Buttress thread (B) Knuckle thread (C) Acme thread (D) Square thread
Ans: B
92. The bottom surface joining the two sides of thread is called __________.
(A) Root (B) Pitch (C) Crest (D) Lead
Ans: A
93. These files are known as fish back file :
(A) Crossing file (B) Barrette file (C) Tinkers file (D) Block file
Ans: B
94. Which method is used for bright finishing of cylindrical surface ?
(A) Spot facing (B) Lapping (C) Honing (D) Reaming
Ans: C
95. This clutch is used in two wheelers :
(A) Dog clutch (B) Centrifugal clutch
(C) Conical clutch (D) Magnetic clutch
Ans: B
96. Knuckle thread is a modified form of __________.
(A) Acme thread (B) V thread (C) Square thread (D) Sawtooth thread
Ans: C
97. __________ is used to power transmission between shaft at various angles.
(A) Spur gear (B) Bevel gear
(C) Helical gear (D) Worm and Shaft gear
Ans: B
98. In a Vernier Caliper the value of one main scale division is __________.
(A) 0.02 mm (B) 0.5 mm (C) 0.01 mm (D) 1 mm
Ans: D
99. Chain slings are used for :
(A) Light load (B) Heavy load (C) Medium load (D) None of these
Ans: B
100. The standard length of GI pipe is __________.
(A) 6 m (B) 5 m (C) 10 m (D) 4 m
Ans: A
· UPSC Exam Syllabus- Mechanical Engineering
· Mechanical Engineering
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· Mechanical Engineering
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