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Electrical Machines

Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 saddle shape
 peaky in nature
 sine wave

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 windage and friction loss
 core loss only
 Copper loss

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  both.
  none.
  larger output.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
None of these
  Transistor series regulator.
  Transistor shunt regulator.

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 both A and B
 K × input power
 (1-K) × input power
None of these

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4SP²

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