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Electrical Machines

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

 conduction.
All of these
 radiation.
  convection.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α²
 Cos α
 sin (α/2)

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Electrical Machines
The functions of inter poles are

 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.
 both 1 and 2
None of these

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 60°.
 90°.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imax.

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Electrical Machines
Eddy current loss will depends on

 Flux density
 Frequency
 Thickness
All of these

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