Question

Transformer oils must have _________

(a) More oiliness

(b) More viscosity

(c) Good dielectric strength

(d) Low dielectric strength

This question was addressed to me in examination.

The question is from Lubricants General Questions in chapter Lubricants of Applied Chemistry

Answer 1

The correct choice is (c) Good dielectric strength

For explanation: The transformer oils must be filtered and dried properly before they put into use because any moisture in them may damage the device or leads to short circuits. The dielectric oils must have good dielectric strength.