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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf.
  f / s.
  sf / 2.
  s2.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed falls.
 deteriorate and the speed rises.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/3
 1/√2
 2/√5
 1/√5

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  negative phase sequence currents are generated.
  damper bar develops torque.
  harmonic are developed in the armature circuit.

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

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

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
 Increases.
  Decreases.
 Remains unchanged.

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