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Electric Traction - section-1
Electric Traction - Section-2
  1. Which of the following braking systems is used on steam locomotives?

    2. A.

     Hydraulic system
    B.

     Pneumatic system
    C.

     Vacuum system
    D.

     None of the above

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  2. An ideal traction system should have

    3. A.

     Easy speed control
    B.

     High starting tractive effort
    C.

     Equipment capable of withstanding large temporary loads
    D.

     All of the above

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  3. Locomotive having mono-motor bogies

    4. A.

     Has better coefficient of adhesion
    B.

     Are suited both for passenger as well as freight service
    C.

     Has better riding qualities due to the reduction of lateral forces
    D.

     Has all above qualities

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  4. For diesel locomotives the range of horsepower is

    5. A.

     50 to 200
    B.

     500 to 1000
    C.

     1500 to 2500
    D.

     3000 to 5000

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  5. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction?

    6. A.

     Reduced current method
    B.

     Tap changing control of transformer
    C.

     Series parallel operation of motors
    D.

     All of the above

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  6. The efficiency of diesel locomotives is nearly

    7. A.

     20 to 25 percent
    B.

     30 to 40 percent
    C.

     45 to 55 percent
    D.

     60 to 70 percent

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  7. For three-phase induction motors which of the following is the least efficient method of speed control?

    8. A.

     Cascade control
    B.

     Pole changing
    C.

     Rheostat control
    D.

     Combination of cascade and pole changing

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  8. Which of the following is the advantage of electric braking?

    9. A.

     It avoids wear of track
    B.

     Motor continues to remain loaded during braking
    C.

     It is instantaneous
    D.

     More heat is generated during braking

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  9. Speed-time curve of main line service differs from those of urban and suburban services on following account

    10. A.

     It has longer free running period
    B.

     It has longer coasting period
    C.

     Accelerating and braking periods are comparatively smaller
    D.

     All of the above

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  10. Locomotives with monometer bogies have

    11. A.

     Uneven distribution of tractive effect
    B.

     Suitability for passenger as well as freight service
    C.

     Lot of skidding
    D.

     Low coefficient of adhesion

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