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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly increase.
 not change.
 slightly decrease.
None of these

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
 4 %.
  less than 1 %.
 1.5 %.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
None of these
  the supply voltage and the back emf.
  the rotating stator flux and rotor flux.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
 4.
 2.
  8.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 less than 30 W
 zero watt
 more than 30 W
 30 W

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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?

 1820W
 1920W
 1450W
 2000W

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