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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 shunt motors
 both B and C
 series motors

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Electrical Machines
The condition for maximum running torque is

 R = S.X
 unity
 0.707 lagging
 zero
 0.5 lagging

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 rating.
 leakage reactance.
 efficiency.
 percentage impedance.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 both A and B.
 terminal voltage should be same.
 rating of generators should be same.
 polarities should be same.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
  8.
 6.
 4.

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

 decrease.
 not change.
 increase.
 None of above.

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MORE MCQ ON Electrical Machines

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