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Electrical Machines

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

 400 V.
 350 V.
 420 V.
 480 V.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a finite negative value
 0
 ∞
 a positive finite value

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 0.08
 -0.08
 -1.92

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 3/4.
 9/16.
 4/3.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Eight times.
 Remains same.
 Four times.
 Doubled.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 copper graphite → low voltage high current density
 electro graphite → large ratings
 carbon brush → normal ratings

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