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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?

  0.905.
  0.05.
 1.1.
 20.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
  high starting torque operation.
 constant speed operation.
 low starting torque operation.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use drum winding.
 the use of compensating winding.

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Electrical Machines
The output voltage of a DC generator is

  E = V + IaRa.
 E = V + Ra.
 E = V – IaRa.
 E = V + Ia.

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 shunt motors.
 separately excited motors.
 differential compound motors.

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Electrical Machines
The type of DC motor used for shears and punches is

  Cummulative compound motor.
 Series motor.
 Shunt motor.
 Differential compound motor.

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