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Electrical Machines

Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 changes.
 same.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 3000 rpm
 1500 rpm
 4000 rpm

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Electrical Machines
A compound motor has

  both shunt and series field winding.
  only series field winding.
  only shunt field winding.
  tertiary winding.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating electric flux.
 constant magnetic flux.
 alternating magnetic lux.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Cumulative compound motor.
  Series motor.
  Shunt motor.

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Electrical Machines
Armature reaction in dc motor results

  open circuit.
  decrease in speed.
  increase in speed.
  short circuit.

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MORE MCQ ON Electrical Machines

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