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EEE :: Electric Traction

  1. Coefficient of adhesion reduces due to the presence of which of the following?

  2. A.

     Sand on rails

    B.

     Dew on rails

    C.

     Oil on the rails

    D.

     Both (B) and (C)

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  3. Long distance railways use which of the following?

  4. A.

     200 V D.C.

    B.

     25 kV single phase A.C.

    C.

     25 kV two phase A.C.

    D.

     25 kV three phase A.C.

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  5. The specific energy consumption of a train depends on which of the following?

  6. A.

     Acceleration and retardation

    B.

     Gradient

    C.

     Distance covered

    D.

     All of the above

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  7. The pulsating torque exerted by steam locomotives causes which of the following?

  8. A.

     Jolting and skidding

    B.

     Hammer blow

    C.

     Pitching

    D.

     All of the above

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  9. Coefficient of adhesion is

  10. 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

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  11. Which of the following braking systems on the locomotives is costly?

  12. A.

     Regenerative braking on electric locomotives

    B.

     Vacuum braking on diesel locomotives

    C.

     Vacuum braking on steam locomotives

    D.

     All braking systems are equally costly

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  13. Battery operated trucks are used in

  14. A.

     Steel mills

    B.

     Power stations

    C.

     Narrow gauge traction

    D.

     Factories for material transportation

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  15. Main traction systems used in India are, those using

  16. A.

     Electric locomotives

    B.

     Diesel engine locomotives

    C.

     Steam engine locomotives

    D.

     All of the above

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  17. Series motor is not suited for traction duty due to which of the following account?

  18. 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

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  19. Specific energy consumption is affected by which of the following factors?

  20. A.

     Retardation and acceleration values

    B.

     Gradient

    C.

     Distance between stops

    D.

     All of the above

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