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Electrical Machines

Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 same.
 changes.

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Electrical Machines
If input of a transformer is square wave the output will be

 triangular wave.
 square wave.
  pulsed wave.
 sine wave.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I and P/2
 V/2, I/2 and P/4
 V, I and P
 V, I/2 and P/2

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

  remains unchanged.
 decreased.
 increased.
 kept constant to certain value.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Synchronous motor.
 AC single phase motor.
 Induction motor.

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

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

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