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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 parabola
 hyperbola
 any of the above

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
All of these
 increase the maintenance and repair
 increases the design cost

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  pulsating.
  sinusoidal.
  flat topped.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 twice the initial value
 1/2 of the initial value
 4 time the initial value

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 rated transformer voltage
 high frequency supply
 direct current

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

  EIa.
  EbIa.
  EbIa2.
  none of these.

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