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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  15 %.
  2.5 %.
 10 %.

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Shunt motor.
  Cummulative compound motor.
 Series motor.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
 Split phase type.
 Shaded pole type.
  Capacitor run type.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/√3
 1/√3, 1/3
 1/3, 1/√3

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of crawling.
 reduce the chance of cogging.
 reduce the magnetizing current.
 increase the starting torque.

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

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

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MORE MCQ ON Electrical Machines

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