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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 lagging
 leading
 unity

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  very small, say about 2 or 3 V.
  250 V.
 about 100 V.
  zero.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Field current.
 Armature current.
 None of above.
 Line current.

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Electrical Machines
Rotating part of DC motor is known as

 Carbone brush.
 Pole.
 Starter.
 Armature.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  AC slip ring IM.
  Capacitor type induction motors.
  DC series motor.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 both A and B.
 terminal voltage should be same.
 rating of generators should be same.

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