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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 total iron losses
 copper loss

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 start haunting.
 run at very high speed.
 burn.
 run at very low speed.

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less maintenance.
  less cost.
  simple in construction.

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Electrical Machines
Torque developed in the rotor is

 not dependent on the slip
 directly proportional to slip
 inversely proportional to slip
 either of these

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Electrical Machines
DC shunt motors are suitable for

 Blowers and fans.
 Lathes.
  All of this.
 Centrifugal pumps

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 stator of a dc machine.
 rotor of an synchronous machine.
 rotor of a dc machine.

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