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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 triangular wave.
 square wave.
  pulsed wave.

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Series motor.
  Shunt motor.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 4
 2, 3
 1, 3
 1, 4

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 turn- ratios are exactly equal
 percentage impedances are equal
 KVA ratings are equal
 polarities are properly connected

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 230 V
 some what more than 230 V
 some what less than 230 V
 not possible

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 short circuit.
 increase in slip.
 open circuit.

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MORE MCQ ON Electrical Machines

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