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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
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
 Proportional to the square of armature current.
 Inversely proportional to armature current.
  Constant.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 increase
 remain the same
 decrease

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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?

 3KW
 0.5Kw
 2KW
 1.5KW

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Electrical Machines
Methods of synchronizing of alternator may be done by

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

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 less than that of second transformer.
 none of these.
  more than that of second transformer.

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