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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 f
 f²
 V

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
  4.
 16.
 8.

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 directly as Xs2
 directly as synchronous reactances Xs
 inversely as 1/Xs

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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

 30 W.
 36 W.
 28 W.
 25 W.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 rough commutator surface.
 any of above.
 imperfect contact.
 severe sparking.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 2, 4, 5
 2, 3, 5
 1, 4,5
 1 , 3, 5

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