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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 28 W.
 25 W.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 two.
 six.
 three.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 same.
 between 50% and 90%.
 less than 50%.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 using transformer oil of better quality.
 increasing the number of turns.
 using the magnetic core of low reluctance.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 0 V
 4 V

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 1/V
 supply voltage V
 V²

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