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Electrical Machines

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

 90°.
 30°.
 60°.
 120°.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 more.
 less than 50%.
 same.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 Separately excited DC motor.
 DC compound motor.
 DC series motor.

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

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

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Electrical Machines
The primary and secondary windings of a transformer are

  inductively linked.
  conductively linked.
 electrically linked.
 mechanically linked.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 Ward Leonard control.
 rheostatic control.
 none of above.

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