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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

 28 W.
 36 W.
 25 W.
 30 W.

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant torque control
 constant current control
 constant power control

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and dc excitation at constant load
 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting
All of these

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 500W
 100W
 3000W

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 same.
 changes.
 none of above.
 different.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 shaded, shaded
 unshaded, unshaded
 shaded, unshaded

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