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Electrical Machines

Electrical Machines
Slip exists in

  in both machines.
  none of above.
  induction motor.
  synchronous motor.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Separately Excited DC Motor
 Compound Wound DC Motor
 DC Series Motor

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
  silicon steel.
 cast steel.
 wrought iron.

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Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  vibrations.
  over excitation.
  heating.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
 DC.
 both of above.
None of these

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 rotor resistance
 supply frequency
 supply voltage

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