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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
  4.
 16.
 32.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
 3 - phase to ground fault.
  line to ground fault.
 3 - phase fault.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 start automatically without trouble.
 develop very low starting torque.
 not start automatically.

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Electrical Machines
Hunting in a synchronous motor takes place

  when load varies.
  when supply voltage fluctuates.
  when power factor is unity.
  motor is under loaded.

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MORE MCQ ON Electrical Machines

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