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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 400 V.
 420 V.
 350 V.

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start capacitor run IM.
  Synchronous motor.
  Split phase IM.
  Capacitor start IM.

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 inversely as applied voltage
 directly as applied voltage
 directly as square of applied voltage

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Armature resistance control.
 Field diverter control.
 Armature voltage control.

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Electrical Machines
Eddy current loss will depends on

 Thickness
All of these
 Flux density
 Frequency

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Series motor.
 Cummulative compound motor.
 Shunt motor.

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