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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Lathes.
  All of this.
 Centrifugal pumps
 Blowers and fans.

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

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 rubber insulation.
 wooden insulation.
  paper insulation.
 cotton insulation.

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Electrical Machines
Breather is provided in a transformer to

  absorb moisture of air during breathing.
 absorb moisture from air entering in transformer.
 filter the transformer oil.
 provide cold air in transformer.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  cogging.
  air gap.
  crawling.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very low.
 Normal.
 Very high.

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MORE MCQ ON Electrical Machines

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