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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  speed and voltage.
 speed.
  voltage.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  double cage rotor.
  short-circuited rotor.
  any of the above.

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Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Partial motor.
 Slip induction motor.
 Universal motor.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Slip ring induction motor.
  DC differential compound motor.
  Synchronous motor.
  Stepper motor.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 0 V
 4 V

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