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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
 10 %.
  15 %.
  2.5 %.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 ZPF method.
 MMf method.
All of these
 Synchronous impedance method.

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 Both Synchronous and Induction motor
 Synchronous motors
 DC Shunt Motor

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing any two leads from supply.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  synchronous motor.
  transformer with short-circuited secondary.
  repulsion motor type starting.
  capacitor run IM.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in short circuit.
  Nothing will happen.
  Will results in open circuit.
  Fail to start.

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