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Electrical Machines

Electrical Machines
Maximum power developed depends on

 both 1and 2
 load angle
 voltage
 reactance

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 26.21 kW.
 23.06 kW.
 24.11 kW.

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

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 86.91 V.
 56.91 V.
  66.91 V.
 76.91 V.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to an AC source.
  to a DC source.
 to earth.

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 start the motor.
 improve the starting torque.
 improve the power factor.

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