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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 200 V.
 230 V.
 460 V.

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Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
 around 500 ohms.
 Infinitely large.
  Low.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

  PN / 2 Hz.
 120N / P Hz.
 120 / PN Hz.
 120P / N Hz.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  reactance voltage.
None of these
  dynamically induced voltage.
  statically induced voltage.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  increases upto a limit and then remains almost constant.
  decreases.
 increases.
  remains constant.

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
  f.
 f3.
 f2.

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MORE MCQ ON Electrical Machines

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