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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 0°
 70° to 85°
 25° to 30°

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 0.1 Ω
 100 Ω
 10 Ω

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Electrical Machines
Capacitor in split phase induction motor is used to

 start the motor.
 reduce the harmonics.
 improve the starting torque.
 improve the power factor.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  250 V.
  zero.
  very small, say about 2 or 3 V.
 about 100 V.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  provide starting torque only.
  reduce the eddy currents.
  reduce noise level only.
  prevent hunting and provide the starting torque.

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Electrical Machines
For pure resistive load what is the armature reaction?

 demagnetization
 cross magnetization
 magnetization
All of these

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MORE MCQ ON Electrical Machines

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