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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 wave winding
 both 1 and 2
 lap winding
None of these

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
  universal motor.
 repulsion motor.
 reluctance motor.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 40 - 400 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 250 rpm
 2000 rpm
 1000 rpm

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Electrical Machines
Transformer action requires a

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

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  prevent hunting and provide the starting torque.
  provide starting torque only.
  reduce noise level only.
  reduce the eddy currents.

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