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Electric Traction - Interview Questions and Answers

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16. In tramways which of the following motors is used ?
A. D.C. shunt motor
B. D.C. series motor
C. A.C. three phase motor
D. AC. single phase capacitor start motor
Explanation:
17. The value of co-efficient of adhesion will be high when rails are
A. greased
B. wet
C. sprayed with oil
D. cleaned with sand
Explanation:
18. Series motor is not suited for traction duty due to which of the following account ?
A. Less current drain on the heavy load torque
B. Current surges after temporary switching off supply
C. Self relieving property
D. Commutating property at heavy load
Explanation:
19. The specific energy consumption of a train depends on which of the following ?
A. Acceleration and retardation
B. Gradient
C. Distance covered
D. All of the above
Explanation:
20. Due to which of the following co-efficient of adhesion improves ?
A. Rust on the rails
B. Dust on the rails
C. Sand on the rails
D. All of the above
Explanation:
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