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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
 20.
  0.905.
  0.05.

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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
 40 HZ
 60 Hz
 50 Hz

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Commutator.
 Eye bolt.
 Equalizer rings.

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Electrical Machines
Which of the following motor used in hair dryers?

  Shaded pole IM.
  Cage induction motor.
  Synchronous motors.
  Split phase IM.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 280 V.
 150 V.
 220 V.

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer voltage
 direct current
 rated transformer current

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