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electric traction MCQs

Practise focused electric traction questions with marked answers for exam preparation and subject revision.

electric traction Mcqs
1. Which of the following is the voltage for single phase A.C. system ?
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A. 22 V

B. None of the above

C. 5 kV

D. 440 V

E. 15 kV

2. An ideal traction system should have_______________?
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A. all of the above

B. high starting tractive effort

C. easy speed control

D. equipment capable of with standing large temporary loads

3. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Steam engine

B. Battery locomotive

C. Diesel engine

D. Any of the above

4. The return circuit for tramcars is through_______________?
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A. rails

B. common earthing

C. neutral wire

D. cables

5. Battery operated trucks are used in________________?
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A. factories for material transportation

B. steel mills

C. power stations

D. narrow gauge traction

6. Main traction systems used in India are, those using______________?
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A. electric locomotives

B. steam engine locomotives

C. diesel electric locomotives

D. diesel engine locomotives

E. all of the above
7. The normal value of adhesion friction is______________?
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A. 0.75

B. 0.25

C. 0.12

D. 0.4

8. For diesel locomotives the range of horsepower is_______________?
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A. 50 to 200

B. 500 to 1000

C. 1500 to 2500

D. 3000 to 5000

9. Locomotives with monometer bogies have_________________?
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A. low co-efficient of adhesion

B. uneven distribution of tractive effect

C. lot of skidding

D. suitability for passanger as well as freight service
10. Series motor is not suited for traction duty due to which of the following account ?
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A. Current surges after temporary switching off supply

B. Self relieving property

C. Commutating property at heavy load

D. Less current drain on the heavy load torque

11. The rate of acceleration on suburban orurban services is restricted by the consideration of______________?
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A. Passenger Discomfort

B. Track size

C. Track curves

D. Engine power

12. The wheels of a train, engine as well as bogies, are slightly tapered to_____________?
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A. facilitate in taking turns

B. facilitate braking

C. reduce friction

D. increase friction

13. Quadrilateral speed-time curve pertains to which of the following services ?
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A. Sub-urban service

B. Main line service

C. Urban and sub-urban service

D. Urban service

14. Which of the following is the disadvantage of electric traction over other systems of traction ?
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A. Interference with communication lines

B. All of the above

C. Short time power failure interrupts traffic for hours

D. Corrosion problems in the under-ground pipe work

E. High capital outlay in fixed installations beside route limitation
15. Which of the following is the advantage of electric braking ?
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A. Motor continues to remain loaded during braking

B. It is instantaneous

C. More heat is generated during braking

D. It avoids wear of track
16. Co-efficient of adhesion reduces due to the presence of which of the following ?
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A. Sand on rails

B. Dew on rails

C. Oil on the rails

D. both B. and C.
17. The value of co-efficient of adhesion will be high when rails are_________________?
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A. wet

B. sprayed with oil

C. cleaned with sand

D. greased

18. In case of _________________ free running and coasting periods are generally long ?
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A. main-line service

B. all of the above

C. urban service

D. sub-urban service

19. For 25 kV single phase system power supply frequency is_______________?
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A. 25 Hz

B. 50 Hz

C. 60 Hz

D. 16 Hz

20. For given maximum axle load tractive efforts of AC. locomotive will be_____________?
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A. none of the above

B. more than that of D.C. locomotive

C. equal to that of D.C. locomotive

D. less than that of D.C. locomotive

21. Which of the following is an advantage of electric traction over other methods of traction ?
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A. Faster acceleration

B. Better braking action

C. No pollution problems

D. All of the above

22. The resistance encountered by a train in motion is on account of_________________?
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A. friction at various parts of the rolling stock

B. resistance offered by air

C. friction at the track

D. all of the above
23. The voltage used for suburban trains in D.C. system is usually_______________?
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A. 24 V

B. 600 to 750 V

C. 12 V

D. 220 V

24. Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
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A. it has longer coasting period

B. it has longer free running period

C. all of the above

D. accelerating and braking periods are comparatively smaller

25. Which of the following braking systems on the locomotives is costly ?
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A. Regenerative braking on electric locomotives

B. Vacuum braking on diesel locomotives

C. All braking systems are equally costly

D. Vacuum braking on steam locomotives

26. Tractive effort is required to_____________?
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A. overcome the gravity component of train mass

B. overcome friction, windage and curve resistance

C. accelerate the train mass

D. do all of the above
27. Specific energy consumption is least in ________________ service?
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A. urban

B. main line

C. suburban

28. Specific energy consumption is affected by which of the following factors ?
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A. Distance between stops

B. Gradient

C. Retardation and acceleration values

D. All of the above
29. Electric locomotives in India are manufactured at______________?
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A. Gorakhpur

B. Jamalpur

C. Bangalore

D. Chittranjan
30. Overload capacity of diesel engines is usually restricted to_______________?
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A. 20 percent

B. 2 percent

C. 10 percent

D. 40 percent

31. Which of the following state capitals is not on broad gauge track ?
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A. Lucknow

B. Chandigarh

C. Jaipur

D. Bhopal

32. In case of locomotives the tractive power is provided by______________?
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A. single cylinder double acting steam engine

B. single stage steam turbine

C. double cylinder, single acting steam engine

D. double cylinder, double acting steam engine
33. For three-phase induction motors which of the following is the least efficient method of speed control ?
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A. Cascade control

B. Rheostat control

C. Pole changing

D. Combination of cascade and pole changing

34. In case of steam engines the steam pressure is_______________?
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A. 10 to 15 kgf/cm2

B. 1 to 4 kgf/cm2

C. 25 to 35 kgf/cm2

D. 5 to 8 kgf/cm2

35. The pulsating torque exerted by steam locomotives causes which of the following ?
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A. All of the above

B. Jolting and skidding

C. Hammer blow

D. Pitching

36. Locomotive having monomotor bogies________________?
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A. has better coefficient of adhesion

B. are suited both for passanger as well as freight service

C. has better riding qualities due to the reduction of lateral forces

D. has all above qualities
37. Energy consumption in propelling the train is required for which of the following?
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A. Acceleration

B. Work against gravity while moving up the gradient

C. Work against the resistance to motion

D. All of the above
38. The steam engine provided on steam locomotives is____________?
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A. single acting non-condensing type

B. double acting non-condensing type

C. double acting condensing type

D. single acting condensing type

39. Specific energy consumption becomes________________?
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A. more with high train resistance

B. less if distance between stops is more

C. more on steeper gradient

D. all of the above
40. The speed of a locomotive is controlled by_______________?
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A. regulating steam flow to engine

B. flywheel

C. gear box

D. applying brakes 11.

41. The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to_____________/
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A. 10

B. 17

C. 14

D. 5

42. When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?
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A. wheel base of axles is more

B. degree of curvature is more

C. both A. and B.

D. none of the above

43. The friction at the track is proportional to________________?
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A. 1/speed

B. speed

C. none of the above

D. l/(speed)2

44. In tramways which of the following motors is used ?
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A. A.C. three phase motor

B. D.C. series motor

C. D.C. shunt motor

D. AC. single phase capacitor start motor

45. _______________method can bring the locomotive to dead stop?
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A. Plugging braking

B. None of the above

C. Rheostatic braking

D. Regenerative braking

46. Automatic signalling is used for which of the following trains ?
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A. Mail and express trains

B. Superfast trains

C. All trains

D. Suburban and Urban electric trains

47. In a steam locomotive electric power is provided through_____________?
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A. diesel engine generator

B. overhead wire

C. battery system

D. small turbo-generator
48. The speed of a superfast train is______________?
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A. more than 100 kmph

B. 75 kmph

C. 60 kmph

D. 100 kmph

49. The horsepower of steam locomotives is______________?
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A. 1500 to 2000

B. 3000 to 4000

C. up to 1500

D. 2000 to 3000

50. The efficiency of diesel locomotives is nearly_______________?
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A. 20 to 25 percent

B. 30 to 40 percent

C. 45 to 55 percent

D. 60 to 70 percent