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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f3.
  f.
 f2.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 They are not hard as copper brush
 In case of any sparking they will be less damaged than copper brushes
 They are self lubricating in nature
All of these

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  parallel.
  any one of the connection.
  series.

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

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

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 < I2
 I1 > I2
None of these
 I1 = I2

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 compensating winding.
 damping winding.
  common winding.

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