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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 constant loss
 both A and B
 variable loss

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 B - C - A.
 C - A - B.

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Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f3.
 f1.5.

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Compensating winding will act under the pole.
 Both A and B.
 Inter pole winding will act in interpolar region.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 700 W
 600 W
 625 W
 650 W

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 decrease
 increase gradually and then stay at rated voltage
 remain nearly constant

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