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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 rectangular
 sinusoidal
 flat-topped

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant current control
 constant torque control
 constant voltage control

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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 and 2
 2 and 3
 1, 2 and 3
 1 and 3

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  shunt generator.
  level compound.
 series generator.
  short - shunt generator.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 full wave
 half wave controlled
 half wave

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 30°.
 60°.
 120°.

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MORE MCQ ON Electrical Machines

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