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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 sinδ
 sin2δ
 cos2δ

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Peaky in nature.
 Saddle shape.
 Triangular and directed towards main pole.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Differently compounded.
 Series.
 Shunt.
 Cummulative compound.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 35 Hz.
  Can be determined.
 20 Hz.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 decreased.
 remains same.
  increased.
 kept constant to certain value.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
  50 - 150 W.
 10 - 20 W.
 200 - 250 W.

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MORE MCQ ON Electrical Machines

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