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Electric Traction - section-1
Electric Traction - Section-2
  1. The wheels of a train, engine as well as bogies, are slightly tapered to

    2. A.

     Reduce friction
    B.

     Increase friction
    C.

     Facilitate braking
    D.

     Facilitate in taking turns

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  2. For 25 kV single phase system power supply frequency is

    3. A.

     60 Hz
    B.

     50 Hz
    C.

     25 Hz
    D.

     16 Hz

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  3. For given maximum axle load tractive efforts of AC. locomotive will be

    4. 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

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  4. The speed of a superfast train is

    5. A.

     60 kmph
    B.

     75 kmph
    C.

     100 kmph
    D.

     More than 100 kmph

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  5. The normal value of adhesion friction is

    6. A.

     0.12
    B.

     0.25
    C.

     0.40
    D.

     0.75

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  6. In main line service as compared to urban and suburban service

    7. A.

     Distance between the stops is more
    B.

     Maximum speed reached is high
    C.

     Acceleration and retardation rates are low
    D.

     All of the above

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  7. Power for lighting in passenger coach, in a long distance electric train, is provided

    8. A.

     Directly through overhead electric line
    B.

     Through individual generator of bogie and batteries
    C.

     Through rails
    D.

     Through locomotive

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  8. The voltage used for suburban trains in D.C. system is usually

    9. A.

     12 V
    B.

     24 V
    C.

     220 V
    D.

     600 to 750 V

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  9. Vacuum is created by which of the following?

    10. A.

     Vacuum pump
    B.

     Ejector
    C.

     Any of the above
    D.

     None of the above

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  10. Energy consumption in propelling the train is required for which of the following?

    11. A.

     Work against the resistance to motion
    B.

     Work against gravity while moving up the gradient
    C.

     Acceleration
    D.

     All of the above

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