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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Radiator.
 Conservator tank.
 Tap changer.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Semi closed slot type machine.
 Open slot type machines.
 Any of the above.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Cross magnetization
 Demagnetization
 Magnetization

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 3
 3 only
 1, 2 and 3
 1, 2, 3 and 4

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Mica.
  Vacuum.
  Oil impregnated paper.
  Glass.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

None of these
 Shaded pole motor.
 Split phase motor.
  PSC (permanent split capacitor) motor.

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