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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 constant loss
 both A and B
 variable loss

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 field weakening method
None of these
 same in both methods
 armature resistance control

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.
  It will rotates in normal operation.
  Fail to start.

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Electrical Machines
Rotating part of DC motor is known as

 Starter.
 Carbone brush.
 Armature.
 Pole.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 same.
 none of above.
 different.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Hysteresis losses
 All of the them
 Friction and windage losses

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