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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
  0.905.
 20.

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Electrical Machines
Armature reaction in DC generators will result in

 open circuit.
 short circuit.
 increase in slip.
 reduction in generated emf.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 100 VA
 110 VA
 550 VA

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Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Domestic pump.
  Lift.
  Traction.

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

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

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  breaking torque.
  power factor.
  cost of operation.

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