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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve power factor.
  improve efficiency.
  improve starting torque.
  reduce copper loss.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Zero power factor.
 Lagging power factor.
 Unity power factor.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 tertiary winding.
 compensating winding.
 damping winding.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
 Yoke.
  Commutator.
 Armature.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
  240 rpm.
 450 rpm.
 540 rpm.

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MORE MCQ ON Electrical Machines

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