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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?

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.
 stator of a dc machine.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 48.5Hz
 1.5Hz
 51.5Hz

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 None of these.
 Full load speed.
  Full load current.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

  demagnetizing.
 cross – magnetizing.
 ineffective.
 magnetizing.

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 finite value
 1
 0

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