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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  load.
  speed and voltage.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
None of these
 inversely as applied voltage
 directly as applied voltage

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 equal to core loss.
  more than core loss.
 less than core loss.
 zero.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
 Compound (cummolative).
  Shunt.
 Series.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  disconnecting any one phase.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  transposing any two leads from supply.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  increase the starting torque.
  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.

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MORE MCQ ON Electrical Machines

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