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Electrical Machines

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

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

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 increase pull out torque
 reduce magnetising current and improve power factor
 decrease starting torque
 improve starting torque

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is 0°.
  input power factor is unity.
  load angle is equal to internal angle θ.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 three.
 two.
 four.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
 8 KW.
  2 KW.
 10 KW.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
All of these
 continuity supply is maintained
 Increase efficiency under light load conditions

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MORE MCQ ON Electrical Machines

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