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 a sinusoidal voltage source is connected to a power transformer, it's no load current would be

On no load phasor diagram of transformer, the core loss component of the current remains in phase with

Morning Exam