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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 copper loss.
 hysteresis loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
Universal motors are used in

 cranes
 traction
 food processing
All of these

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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

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

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
  230.2 V.
 399 V.
 50 V.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 200 V.
 115 V.
 460 V.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 increase the permeability.
 reduce hysteresis loss only.
 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.

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