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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 50 Hz
 40 HZ
 60 Hz

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 0.
 8 KW.
 10 KW.

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

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

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Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
Which of the following motors is/are widely used?

 squirrel cage induction motor
 either of these
 slip ring induction motor
None of these

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

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

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