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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor run
 Capacitor start
 Resistance split phase

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 f
 V

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 commutator in the polar axis.
 armature in the polar axis.
 commutator in the inter polar axis.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the hysteresis loss.
  reduces the saturation magnetization.
None of these
  increases the electrical resistivity of iron.

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Electrical Machines
In DC machine yoke offers

 flux path completion
 produce working flux
 both A and B
 mechanical protection to the machine

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 reduced size.
 low starting torque.
  quick acceleration.
 high efficiency.

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