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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 increases.
 remains constant.
 decreases.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.
 6000 W, 7000 W.

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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

  f / s.
  sf.
  s2.
  sf / 2.

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Electrical Machines
Field weakening control method is used for the _________ ?

 both A and B
 below rated speed
None of these
 above rated speed

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Electrical Machines
Eddy current loss will depends on

 Thickness
 Frequency
All of these
 Flux density

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 silicon steel.
 carbon.

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