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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?

 1450W
 2000W
 1920W
 1820W

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Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
  Commutator.
 Tap changer.
 Conservator tank.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 1130 r.p.m.
 none of above.
 4575.4 r.p.m.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high speed.
  high field resistance.
  magnetic inertia.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
 Increase efficiency under light load conditions
All of these
 continuity supply is maintained

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 high and high
 high and low
 low and high

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