electric traction MCQs – Page 2

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

electric traction Mcqs

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.

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