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Electrical Machines

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

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

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Electrical Machines
Transformer action requires a

 constant magnetic flux.
 alternating magnetic lux.
 alternating electric flux.
 increasing magnetic flux.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 cogging.
 crawling.
 plugging.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  as small as possible.
  air gap does not matter.
  as wide as possible.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power level.
  Improve current level.
  Improve voltage level.
  Improve power factor.

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MORE MCQ ON Electrical Machines

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