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Electrical Machines

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

 30°.
 90°.
 60°.
 120°.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 neither the voltage nor the torque
 both the torque and voltage
 torque but not the voltage

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 develop very low starting torque.
 start automatically without trouble.
 get damaged.
 not start automatically.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
  222 V.
 225 V.
 230 V.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 remains unaffected
 any of the above
 decreases

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 f²
 f
 V

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MORE MCQ ON Electrical Machines

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