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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 2%
 4%
 5%

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Copper loss
 Magnetic loss

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 2KW
 0.5Kw
 3KW

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Electrical Machines
Methods of synchronizing of alternator may be done by

  all of these.
 one dark two bright.
 all bright lamp method.
 all dark lamp method.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 10
 100
 50

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Electrical Machines
In DC shunt motor if load is increased, the speed

 reduce slightly.
 remains constant.
 increase proportional.
 increased slightly.

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