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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P.
  P and Z.
  none of these.

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

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

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 2
 2 and 1
 4 ang 1

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant voltage control
 constant current control
 constant torque control

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  10 HP.
 15 HP.
  13 HP.
 14 HP.

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant power control
 constant current control
 constant torque control

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MORE MCQ ON Electrical Machines

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