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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC motor
 AC generator
 induction motor
 DC generator

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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

 60 Hz
 25 Hz
 40 HZ
 50 Hz

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 460 V
 115 V
 230 V

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Electrical Machines
Which of the following is/are not a self starting motor?

None of these
 3-phase induction motor
 both 1 and 2
 1-phase induction motor

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 core loses only.
  copper losses.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Below rated speed.
  In one direction only.
  Above rated speed.

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MORE MCQ ON Electrical Machines

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