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Electrical Machines

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?

 2000W
 1920W
 1450W
 1820W

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Universal.
  Split phase.
  Repulsion.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
  35 ppm.
 25 ppm.
 20 ppm.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power high speed motor.
 50 MW generator in a power plant.
  Hermetically sealed motor of refrigerator.
 Fractional horse power slow speed motor.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I/2 and P/4
 V, I/2 and P/2
 V, I and P
 V/2, I and P/2

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 250 rpm
 500 rpm
 1000 rpm

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