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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

 460 V
 115 V
 200 V
 230 V

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 not possible
 230 V
 some what less than 230 V

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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 __________________.

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

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
  lagging.
 unity.

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Electrical Machines
Crawling in an induction motor is due to

  insufficient starting torque.
  slip ring rotor.
  time harmonics in supply.
  space harmonics produced by winding currents.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Delta - star
 Delta - delta
 Star - star

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