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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 60°.
 120°.
 30°.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  pulsating.
  flat topped.
 triangular.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pc/Pi
 √(Pi/Pc)
 (Pi/Pc)2
 Pi/Pc

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 None of above.
 not change.
 increase.
 decrease.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 triangular
 saddle shape
 peaky in nature
 flat tapped or trapezoidal

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant power control
 constant torque control
 constant current control

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MORE MCQ ON Electrical Machines

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