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Electrical Machines

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

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

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same frequency
 same prime mover speed
 same voltage magnitude
 same phase sequence

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

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

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
 Starting torque, operating speed, full load current.
  Full load current.
 Starting torque.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 one fourth.
 4 times.
 double.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
  1 mg of KOH / gm.
 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.

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