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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.

 0.512.
 0.649.
  0.573.
 0.443.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Fibre.
 Silicon steel.
 Mild steel.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under north pole.
 there is no hard and fast rule for this.
 lie under south pole.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
  Effiency.
 Running Torque.
 Starting torque.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 peaky in nature
 flat tapped or trapezoidal
 triangular
 saddle shape

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  capacitor start.
  shaded pole type.
  capacitor run.

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