Question

Insulators making rubbing contact require _______

(a) Low conductivity

(b) High conductivity

(c) Low pressure

(d) High pressure

This question was posed to me by my school teacher while I was bunking the class.

This interesting question is from Classification of Lubricants in division Lubricants of Applied Chemistry

Answer 1

Right option is (a) Low conductivity

The best I can explain: Insulators making rubber contact needed low electrical conductivity. In some other applications of the solid lubricants, the high electrical conductivities. Sliding electric contact requires high electrical conductivity.