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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 25 W.
 30 W.
 36 W.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 920 RPM
 940 RPM
 960 RPM
 970 RPM

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Shunt motor.
  Cumulative compound motor.
  Series motor.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 2.5Hz
 50Hz
 1 Hz

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Electrical Machines
The reduced air gap results in an increase

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

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 collecting of current
 convert AC armature current in to DC
 increase efficiency

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