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Electrical Machines

Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 trapezoidal.
  triangular.
 rectangular.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 below rated speed
None of these
 both 1 and 2

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Electrical Machines
Induction motors provided with open slots have

  leading power factor.
  less breakdown torque.
  higher efficiency.
  more breakdown torque.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 double the supply voltage.
 half of the supply voltage.
All of these

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Electrical Machines
A DC generator can be considered as

 power pump.
 rotating amplifier.
 prime mover.
 rectifier.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  3 - φ IM.
  Universal motor.
  DC shunt motor.

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MORE MCQ ON Electrical Machines

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