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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 DC motor.
 Both A and C.
 Induction motor.

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 limit the starting current to a safer value.
 all of above.
 provide protection against Low-Voltage.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

  Shunt.
 Cummulative compound.
 Differential compound.
 Series.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
 0°.
 90°.
  about 75°.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  1 - φ IM.
  Universal motor.
  3 - φ IM.

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MORE MCQ ON Electrical Machines

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