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Electrical Machines

Electrical Machines
The application that need frequent starting and stopping is

  blowers.
  paper mills.
  jaw crushers.
  lifts and hoists.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very low.
 Zero.
 Very high.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 240 A.
 127 A.
  190 A.
 173 A.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  wound.
  cage.
  none of these.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 1500 rpm
 375 rpm
 75 rpm
 3000 rpm

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Electrical Machines
The DC compound motors are generally

 None of these.
 Level Compound.
 Differentical compound.
 Cummulative compound.

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MORE MCQ ON Electrical Machines

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