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Electrical Machines

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

  voltage.
 speed.
  speed and voltage.
  load.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Series.
  Shunt.
  Compound.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

  1.
 0.6.
 0.8.
 0.4.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 None of the options.
 Both B and C.
 Permanent magnets.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 lagging power factor.
 any of the above.
 unity power factor.

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MORE MCQ ON Electrical Machines

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