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EEE :: Transformers

Transformers - General Questions
Transformers - General Questions 1
Transformers - True or False
  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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  2. The maximum efficiency of a distribution transformer is

    3. A.

     at no load
    B.

     at 50% full load
    C.

     at 80% full load
    D.

     at full load

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

    4. A.

     Overfluxing protection
    B.

     Buchholz relay
    C.

     Overcurrent protection
    D.

     All of the above

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

    5. A.

     decreases the rotor current
    B.

     increases the rotor current
    C.

     rotor current becomes zero
    D.

     rotor current rernains same

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  5. The efficiency of a transformer will be maximum when

    6. 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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  6. The transformer ratings are usually expressed in terms of

    7. A.

     volts
    B.

     amperes
    C.

     kW
    D.

     kVA

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