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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V²
 f²
 V

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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
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
None of these
 not changed

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 45 HZ
 50 Hz
 48.5 Hz
 48 Hz

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
  common winding.
 damping winding.
 tertiary winding.

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
 unity power factor
 leading power factor
None of these

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