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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
  0.573.
 0.512.
 0.443.

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Electrical Machines
Breadth factor is defined as the ratio of

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

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature voltage.
  Supply voltage.
  Field excitaion.
  Armature current.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 component of armature mmf along field axis
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 60
 660
 600

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 motor field terminal.
 motor armature terminal.
 generator field terminal.

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