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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 hysteresis loss
 copper loss
 total iron losses

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
  induction generator.
 synchronous motor.
 synchronous generator.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 10
 5
 12
 24

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/3
 1/√5
 1/√2

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  medium.
  zero.
  low.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 250 A.
 340 A.
 570 A.

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