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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
  convection.
 conduction.
All of these

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Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 square wave.
  pulsed wave.
 triangular wave.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
  restoring torque.
 synchronizing power co efficient.
 damping torque.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm.
  KhfBm1.6.
 Khf2Bm1.6.
 KhfBm3.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 1
 3 or 4
 0
 2

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 both A and B.
 rating of generators should be same.
 polarities should be same.
 terminal voltage should be same.

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