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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°
 10°
 60°
 45°

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
 wrought iron.
 cast steel.
  silicon steel.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
  sinusoidal.
  flat topped.
 triangular.

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 None of above.
 Armature resistance.
 Field resistance.
 Residual magnetism of the generator.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Vt vs load current
 Eg vs Ia
 Eg vs load current

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Electrical Machines
Breadth factor is defined as the ratio of

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

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