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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 60 Hz
 50 Hz
 25 Hz

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will increase
 its speed will reduce
 its efficiency will improve

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 No load.
 Low load.
 None of these.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in same direction.
 it will run in opposite direction.
 it will run in same direction by slowly.

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

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

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