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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 94%
 92%
 96%

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  star connection.
  zig - zag connection.
  delta connection.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increase proportional.
 increased slightly.
 reduce slightly.
 remains constant.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 reduce the magnetic hum and locking tendency of rotor.
 increase the strength of rotor bars.
 decrease the amount of copper to be used.
 provide ease of fabrication.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 any of the above.
 slip speed.

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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

 460 V
 230 V
 200 V
 115 V

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