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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 50 Hz
 40 HZ
 60 Hz

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Electrical Machines
Hysteresis loss is proportional to

 f3.
 f1.5.
  f.
 f2.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 10
 100
 50

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 an inductor.
 A resistor.
  None of these.
 A capacitor.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 350 V.
 420 V.
 400 V.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

  Fleming's left hand rule.
 Fleming's right hand rule.
 Ampere's law.
 Lenz's law.

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