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Electrical Machines

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

 leading
 lagging
 unity
 zero

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor start.
  shaded pole type.
  split phase.
  capacitor run.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

All of these
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of main winding.

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Electrical Machines
Hunting in a synchronous motor takes place

  when load varies.
  motor is under loaded.
  when supply voltage fluctuates.
  when power factor is unity.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  reducing the load voltage.
  increasing the input to the prime mover.
 cooling the armature.
  increasing the excitation.

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 Auto transformer starter.
 DOL starter.
 Star-delta starter.

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MORE MCQ ON Electrical Machines

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