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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 700 W
 600 W
 650 W
 625 W

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Electrical Machines
An unexcited single phase synchronous motor is

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

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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
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in series
 in parallel
 either of these depending on the design of the motor
 through inductive coupling

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 50 Ω
 100 Ω
 0.1 Ω

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 wave winding
 lap winding
 open type winding
 closed winding

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