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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
  0.905.
 20.
 1.1.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  synchronous motor.
  transformer with short-circuited secondary.
  capacitor run IM.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 low starting torque.
 high efficiency.
  quick acceleration.
 reduced size.

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  electromagnetic torque.
  none.
  maximum torque.

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Electrical Machines
Which of the following is the largest conversion device?

 DC machine
 Induction machine
 Synchronous machine
All of these

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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