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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2
 (V2 - E2) / V2

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

 variable loss
None of these
 constant loss
 both A and B

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 -3.33%
 +3%
 -3%

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is equal to internal angle θ.
  load angle is 0°.
  load angle is 45°.
  input power factor is unity.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

 armature reaction.
None of these
  residual magnetism.
  permanent magnets.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 less and maximum torque decreases
 less and maximum torque increases
 more and maximum torque remains constant

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