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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC series motors.
 DC compound motors.
None of these

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 carbon.
 cast iron.
 stainless steel.

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

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

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying number of poles.
  By varying the supply frequency.
  Both (A) and (B).
  By varying supply voltage.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 volume of copper.
 reluctance of core.
 iron loss.

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Electrical Machines
The field system of an alternator is usually excited

  3 - Φ, 50 Hz and 400 V.
  250 / 250 V DC.
  230 V AC.
  110 / 220 V AC.

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