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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Radiator.
 Conservator tank.
 Tap changer.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Operating cost is less.
 Insulation requirement is less.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 remains unaffected
 any of the above
 decreases
 increases

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 auto transformer.
 two winding transformer with secondary short circuited.
None of these

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Electrical Machines
The armature of DC motor is laminated

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

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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

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

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