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Electrical Machines

Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.56 %.
 4.76%.
 2.57 %.
 3.76%.

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

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

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  decreasing of frequency.
  speed can not be increased.
  increasing number of poles.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 240 V
 140 V
 120 V

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
  same.
 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.

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

 36°
 72°
 18°
 30°

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