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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
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

  75°.
 45°.
 30°.
 0°.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the supply voltage and the back emf.
None of these
  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thick
 less and thin
 large and thin

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

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

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Electrical Machines
Tappings of a transformer are provided

 at the middle of hv side
 at the neutral side end of hv side
 at the phase end of hv side
 at the phase end of lv side

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MORE MCQ ON Electrical Machines

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