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Electrical Machines

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

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

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of voltage
 collecting of current without any sparkings
 reduce eddy current loss

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 reduce by 5 %.
 depend on other factors.
 remain unchanged.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 200 V
 460 V
 230 V

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
 both 1 and 2
 excitation power only
None of these

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will become slow.
 motor will attain dangerously high speed
 armature will oscillate about original speed as the mean speed
 armature current will drop

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