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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 72°
 36°
 30°

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Electrical Machines
Field weakening method is also called as-----------?

 constant current control
 constant torque control
 constant power control
 constant voltage control

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  when supply voltage fluctuates.
  motor is under loaded.
  when load varies.

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
  It starts the motor.
  it limits the speed of the motor.
None of these

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 shunt generator
 series generator
 cumulatively compounded generator
 differentially compounded generator

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  magnetising.
 demagnetising.
  none of above.

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MORE MCQ ON Electrical Machines

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