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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 72°
 36°
 18°

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.5+j5.8 ohms
 3.05+j5.08 ohms
 8+j13 ohms
 53+j85 ohms

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 1.98
 0.04, 1.96
 0.02, 0.98

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Electrical Machines
The flux involved in the emf equation of a transformer has

 average value.
 total value.
  maximum value.
 rms value.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole chamfering
 compensating winding
 pole stacking
All of these

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
  2 - s.
 2 + s.
 1 - s.

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