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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2
 (E2 - V2) / E2

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Electrical Machines
Hunting in a synchronous motor takes place

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

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KVA.
 Power drawn in KW.
 Gross power.
 Output power at the shaft.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in opposite direction.
 it will run in same direction.
 it will run in same direction by slowly.

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  hold armature stamping in position.
  provide return path for the flux.
  protect the whole machine.

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 mechanical loss
 copper loss
 iron loss

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