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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  1440 to 2880.
  500 to 720.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  capacitor start induction motor.
  repulsion start induction motor.
  transformer with secondary short circuited.
  synchronous motor.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 Greater than 90°
 0°
 less than 90°

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 30°
 36°
 72°

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and high voltage
 low current and low voltage
 high current and low voltage
 low current and high voltage

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 234.76 N-m.
 133.22 N-m

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MORE MCQ ON Electrical Machines

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