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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 700 W
 625 W
 600 W
 650 W

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  reduces the saturation magnetization.
  increases the electrical resistivity of iron.
  increases the hysteresis loss.
None of these

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  increasing of frequency.
  speed can not be increased.
  decreasing of frequency.

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous motor
 hysteresis motor
 3-phase synchronous generator

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 Separately excited DC motor.
 DC compound motor.
 DC Shunt motor.
 DC series motor.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 develop very low starting torque.
 start automatically without trouble.
 get damaged.

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