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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 full load
 half load
 any of the above

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 zero.
 proportional to square of rotor speed.
 constant independent of speed.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Armature control.
 Multiple voltage control.
 Ward-Leonard control.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction motor
 a synchronous motor
None of these
 an induction generator

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

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

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Both 1and 2
 Frequency should be same
 Terminal voltage is same

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