electric traction Mcqs
51. Overhead lines for power supply to tramcars are at a minimum height of______________?
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A. 3 m

B. 6 m

C. 10 m

D. 15 m

52. have maximum unbalanced forces_______________?
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A. Electric locomotives

B. Diesel shunters

C. Steam locomotives

D. Diesel locomotives

53. In main line service as compared to urban and suburban service______________?
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A. all of the above

B. distance between the stops is more

C. acceleration and retardation rates are low

D. maximum speed reached is high

54. ________________ frequency is not common in low frequency traction system?
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A. 16 Hz

B. 40 Hz

C. 25 Hz

D. non of these

55. The overall efficiency of steam locomotive is around_____________?
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A. 5 to 10 percent

B. 35 to 45 percent

C. 25 to 35 percent

D. 15 to 20 percent

56. Which of the following braking systems is used on steam locomotives ?
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A. Vacuum system

B. Hydraulic system

C. Pneumatic system

D. None of the above

57. Due to which of the following co-efficient of adhesion improves ?
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A. All of the above

B. Dust on the rails

C. Rust on the rails

D. Sand on the rails

58. The specific energy consumption of a train depends on which of the following ?
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A. Gradient

B. All of the above

C. e covered

D. Acceleration and retardation

59. _________ locomotive has the highest operational availability?
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A. Steam

B. Electric

C. Diesel

60. Co-efficient of adhesion is________________-?
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A. high in case of D.C. traction than in the case of AC. traction

B. low in case of D.C. traction than in the case of AC. traction

C. equal in both AC. and D.C. traction

D. any of the above

61. The air resistance to the movement of the train is proportional to_____________?
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A. (speed)

B. speed

C. 1/speed

D. (speed)
62. Vacuum is created by which of the following ?
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A. Ejector

B. Any of the above

C. Vacuum pump

D. None of the above

63. Long distance railways use which of the following ?
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A. 25 kV three phase A.C.

B. 25 kV single phase A.C.

C. 25 kV two phase A.C.

D. 200 V D.C.

64. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
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A. All of the above

B. Series parallel operation of motors

C. Reduced current method

D. Tap changing control of transformer
65. If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
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A. 0.225

B. 0.26

C. 0.16

D. 0.3

66. The braking retardation is usually in the range__________________?
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A. 10 to 15 km phps

B. 0.15 to 0.30 km phps

C. 3 to 5 km phps

D. 0.6 to 2.4 km phps

E. 0.30 to 0.6 km phps

67. For which of the following locomotives the maintenance requirements are the least ?
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A. Steam locomotives

B. Electric locomotives

C. Equal in all of the above

D. Diesel locomotives
68. Power for lighting in passanger coach, in a long distance electric train, is provided_________________?
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A. through rails

B. through locomotive

C. through individual generator of bogie and batteries

D. directly through overhead electric line

69. _______________watt-hours per tonne km is usually the specific energy consumption for suburban services?
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A. 5075

B. 1520

C. 120150

D. 160200

70. Which of the following happens in Kando system ?
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A. Single phase supply is converted into three phase system

B. Three phase A.C. is converted into D.C.

C. None of the above

D. Single phase A.C. is converted into D.C.

71. The rate of acceleration on suburban orurban service is in the range_________________?
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A. 0.2 to 0.5 km phps

B. 1.6 to 4.0 km phps

C. 15 to 25 km phps

D. 5 to 10 km phps

72. The coasting retardation is around_________________?
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A. 1.6 km phps

B. 0.16 km phps

C. 16 km phps

D. 40 km phps

73. Suri transmission is_________________?
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A. hydro-pneumatic

B. mechanical-electrical

C. electrical-pneumatic

D. hydro-mechanical
74. In case of a steam engine an average coal consumption per km is nearly________________?
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A. 28 to 30 kg

B. 150 to 175 kg

C. 100 to 120 kg

D. 60 to 80 kg