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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 eddy current loss
 copper loss
 total iron losses

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Electrical Machines
In DC machine torque is proportional to which of the following?

 both A and B
 flux(φ)
 armature current(Ia)
None of these

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

  201.02 V.
 212 V.
 205 V.
 210 V.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at over load.
 copper loss at half load.
 copper loss at full load.
  copper loss at any load.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 750rpm
 1000 rpm
 1500 rpm
 zero speed

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  maintaining constant excitation.
  providing damper bars in the rotor pole faces.
  running the motor on leading power factors.
  oscillation cannot be damped.

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