Q.
Sludge formation in transformer oil is due to which one of the following?

AIngress of dust particles and moisture in the oil
BAppearance of small fragments of paper, varnish, cotton and other organic materials in the oil
CChemical reaction of transformer oil with the insulating materials
DOxidation of transformer oil

Correct Answer : (D)
Oxidation of transformer oil

Hints :

Sludge formation in transformer oil is due to Oxidation of transformer oil.

If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

The main purpose of performing open circuit on a transformer is to measure its

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