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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.905.
  0.05.
 20.

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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

 2/√5
 1/√5
 1/3
 1/√2

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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

  s2.
  sf.
  sf / 2.
  f / s.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Speed of alternators should be same
 Frequency should be same
 Terminal voltage is same

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.
 field current on Y-axis and armature current on X-axis.
 either of these.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 both 1and 2
 copper loss
 hysteresis loss

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