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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 excitation.
 both 1 and 2.
 load angle.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
 400 A.
 440 A.
  40 A.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 high efficiency.
  quick acceleration.
 low starting torque.
 reduced size.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the speed.
 changing the field excitation.
 varying the applied voltage.
 changing the load.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
 1 - s.
 2 + s.
  2 - s.

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Electrical Machines
A DC compound motor has

 both shunt and series field winding.
 only shunt field winding.
 tertiary winding.
 only series field winding.

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MORE MCQ ON Electrical Machines

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