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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.
 20.
  0.905.
 1.1.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field diverter control.
 Armature resistance control.
 Field control.
 Armature voltage control.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 applied voltage V
 1/V²
 1/V

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 225 Ω.
 145 Ω.
  375 Ω.
 150 Ω.

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Electrical Machines
What are the starters used for starting of cage motors?

 Auto transformer starter.
 Star-delta starter.
 DOL starter.
  All of these.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
 Synchronous speed
None of these
 Slip speed

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