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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 66.3%
 50%
 33.3%

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Around 90 %
 Less than 50 %
 Around 100 %.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
  Stepper motor.
 Reluctance motor.
 Hysteresis motor.

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Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
  All of this.
 Centrifugal pumps

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the mass.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

  Series.
 Shunt.
 Differentical compound.
 Cummulative compound.

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