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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  Equal to 1.
  High.
  Low.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 reluctance motor.
 AC series motor.
 repulsion motor.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 I/Ia2
 Ia
 Ia2

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

 constant loss
 variable loss
 both A and B
None of these

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Single phase IM.
  Slip ring IM.
  Three phase IM.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 DC series motor.
 DC compound motor.
 Separately excited DC motor.

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