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Electric Traction - section-1
Electric Traction - Section-2
  1. Automatic signalling is used for which of the following trains ?

    2. A.

     Mail and express trains
    B.

     Superfast trains
    C.

     Suburban and Urban electric trains
    D.

     All trains

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  2. Which of the following is the voltage for single phase A.C. system?

    3. A.

     22 V
    B.

     440 V
    C.

     5 kV
    D.

     15 kV

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  3. _________ frequency is not common in low frequency traction system

    4. A.

     40 Hz
    B.

     25 Hz
    C.

     16 Hz
    D.

     None of these

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  4. Which of the following happens in Kando system?

    5. A.

     Three phase A.C. is converted into D.C.
    B.

     Single phase A.C. is converted into D.C.
    C.

     Single phase supply is converted into three phase system
    D.

     None of the above

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  5. The coasting retardation is around

    6. A.

     0.16 km phps
    B.

     1.6 km phps
    C.

     16 km phps
    D.

     40 km phps

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  6. Due to which of the following coefficient of adhesion improves?

    7. A.

     Rust on the rails
    B.

     Dust on the rails
    C.

     Sand on the rails
    D.

     All of the above

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  7. Tractive effort is required to

    8. 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

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  8. Automatic signaling is used for which of the following trains?

    9. A.

     Mail and express trains
    B.

     Superfast trains
    C.

     Suburban and Urban electric trains
    D.

     All trains

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  9. In case of steam engines the steam pressure is

    10. A.

     1 to 4 kgf/cm²
    B.

     5 to 8 kgf/cm²
    C.

     10 to 15 kgf/cm²
    D.

     25 to 35 kgf/cm²

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  10. The resistance encountered by a train in motion is on account of

    11. A.

     Resistance offered by air
    B.

     Friction at the track
    C.

     Friction at various parts of the rolling stock
    D.

     All of the above

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