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Electrical Machines

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

 Capacitor run
 Capacitor start
 Shaded pole
 Resistance split phase

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 half wave controlled
 full wave controlled
 full wave

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Electrical Machines
The armature of a DC motor is laminated to reduce

 eddy current loss.
 copper loss.
 friction and windage loss.
 hysteresis loss.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 start automatically without trouble.
 develop very low starting torque.
 get damaged.
 not start automatically.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to the square of armature current.

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

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

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