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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  rotor shaft.
  pole faces.
  stator frame.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 500W
 100W
 3000W
 1000W

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1, 2 and 3
 1 and 2
 2 and 3
 1 and 3

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EIa.
  EbIa.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor run
 Shaded pole
 Resistance split phase
 Capacitor start

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