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Electric Traction - Interview Questions and Answers

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26. For three-phase induction motors which of the following is the least efficient method of speed control ?
A. Cascade control
B. Pole changing
C. Rheostatic control
D. Combination of cascade and pole changing
Explanation:
27. The pulsating torque exerted by steam locomotives causes which of the following?
A. Jolting and skidding
B. Hammer blow
C. Pitching
D. All of the above
Explanation:
28. The normal value of adhesion friction is
A. 0.12
B. 0.25
C. 0.40
D. 0.75
Explanation:
29. For given maximum axle load tractive efforts of AC. locomotive will be
A. less than that of D.C. locomotive
B. more than that of D.C. locomotive
C. equal to that of D.C. locomotive
D. none of the above
Explanation:
30. Battery operated trucks are used in
A. steel mills
B. power stations
C. narrow gauge traction
D. factories for material transportation
Explanation:
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