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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 more.
 same.
 less than 50%.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 copper graphite → low voltage high current density
 carbon brush → normal ratings
 electro graphite → large ratings

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

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

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 both 1 and 2.
 no torque.
 damping torqe.
 eddy current torque.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 234 V
 6 V
 474 V

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  resonance.
  cogging.
  crawling.

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MORE MCQ ON Electrical Machines

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