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Electrical Machines

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

 f
 V²
 V
 f²

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Compensating winding.
 Both Compensating and Commutating pole winding.
 Commutating pole winding.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

  more than that of second transformer.
 equal to that of second transformer.
 less than that of second transformer.
 none of these.

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Electrical Machines
Which of the following is not a part of transformer?

 Conservator tank.
  Commutator.
 Tap changer.
 Radiator.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thin
 less and thick
 large and thick

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 30°.
 45°.
 24°.
  10°.

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