DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Lightning
Magnetizing inrush current
Switching over voltages
Unbalanced protection

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Amount of copper in the winding
Harmonics in the generated emf
Size of the machine
Cost of the machine

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