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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 armature current(Ia)
 flux(φ)
 both A and B

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.
 5 times the synchronous speed.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 0 V.
 20 V.
 40 V.

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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 :

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

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Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 its flux oer pole.
 applied voltage.
 all of these.

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start capacitor run IM.
  Split phase IM.
  Synchronous motor.
  Capacitor start IM.

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