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EEE :: Transformers

  1. Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?

  2. A.

     Its secondary current is 5 A

    B.

     Its secondary voltage is 400 V

    C.

     Its rating is 2 kVA

    D.

     Its secondary current is 20 A

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  3. The maximum efficiency of a distribution transformer is

  4. A.

     at no load

    B.

     at 50% full load

    C.

     at 80% full load

    D.

     at full load

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  5. Which of the following protection is normally not provided on small distribution transformers?

  6. A.

     Overfluxing protection

    B.

     Buchholz relay

    C.

     Overcurrent protection

    D.

     All of the above

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  7. Insertion of resistance in the rotcir of an induction motor to develop a given torque

  8. A.

     decreases the rotor current

    B.

     increases the rotor current

    C.

     rotor current becomes zero

    D.

     rotor current rernains same

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  9. The efficiency of a transformer will be maximum when

  10. A.

     copper losses = hysteresis losses

    B.

     hysteresis losses = eddy current losses

    C.

     eddy current losses = copper losses

    D.

     copper losses = iron losses

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  11. The transformer ratings are usually expressed in terms of

  12. A.

     volts

    B.

     amperes

    C.

     kW

    D.

     kVA

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