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ELECTRICAL MACHINES

Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Slip ring IM.
  Single phase IM.
  Squirrel cage IM.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 25 %.
 15 %.
  10 %.
 50 %.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  8.
  2.
 6.
 4.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.05.
  0.905.
 1.1.

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