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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
 computer printers
 food processing
All of these

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 140 V
 240 V
 175 V
 120 V

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Auxiliary winding.
 Compensating winding.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
 demagnetisation.
  none of above.
  cross-magnetization as well as demagnetization.

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  250 / 250 V DC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
A small air gap in poly phase induction motor helps to

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

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MORE MCQ ON Electrical Machines

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