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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 45°
 60°
 10°

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Electrical Machines
Breadth factor is defined as the ratio of

 both 1 and 2.
None of these
 emf with distributed winding to emf with concentrated winding.
 emf with concentrated winding to emf with distributed winding.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on designed speed.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
  It will run in opposite direction.
 motor will not run.
 It will run in same direction.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Very high.
 Zero.
 Normal.

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Electrical Machines
Use of fractional pitch winding

  results in reduced axial length of the machine.
  make it stiffer.
All of these
  results in reduced leakage reactance.

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MORE MCQ ON Electrical Machines

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