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Electrical Machines

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
 230 V
 115 V

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 unity power factor.
 leading power factor.
 lagging power factor.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce eddy current loss.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 1470 rpm
 zero
 30 rpm

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 1 and 2
 2 and 3
 1, 2 and 3

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  transformer.
  asynchronous motor.
  repulsion motor.

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MORE MCQ ON Electrical Machines

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