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Electrical Machines

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

 2.5Hz
 1 Hz
 2HZ
 50Hz

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 75 W
 50 W
 112.5 W
 168.75 W

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 not run.
 run at normal speed.
 run at lower speed.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 1/V²
 applied voltage V
 1/V

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.54 Ω.
 0.06 Ω.
 0.01 Ω.
  0.54 Ω.

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