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Electrical Machines

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
Essential conditions for two DC generators are connecting for parallel operation is/are

 both A and B.
 polarities should be same.
 terminal voltage should be same.
 rating of generators should be same.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 excitation
 both 1and 2
 load angle

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1200
 1000
 1203

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 86.91 V.
  66.91 V.
 56.91 V.
 76.91 V.

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Electrical Machines
Which of the following motors is/are widely used?

 either of these
None of these
 slip ring induction motor
 squirrel cage induction motor

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