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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 lagging
 zero
 unity

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 choke.
 generator.
 transformer.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
 Full load speed.
  Full load current.
 Full load torque.

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Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 DC motor.
 Induction motor.
 Both A and C.

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Electrical Machines
The reduced air gap results in an increase

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

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 f²
 V²

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