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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 both 2 and 3.
 copper loss.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 2000W
 1820W
 1920W

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in armature coil.
 increase the source frequency.
  increase the speed of shaft rotation.
 increase the number of turns in field coil.

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Electrical Machines
Damper winding is used to

 increase the load current.
 decrease the load current.
 both 1 and 2.
 suppress the hunting.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 20%
 reduced by 20%
 reduced by 10%
 increased by 10%

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 AC synchronous motor.
 shunt motor.
  series motor.

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