Question

What is the suitable material for small plain plug gauges?

(a) Any type of steel

(b) Light metal alloys

(c) Non-metallic handles may be used

(d) Aluminum

I have been asked this question in a national level competition.

The origin of the question is Plain Gauges in chapter Limits, Fits and Gauges of Engineering Metrology

Answer 1

Right answer is (c) Non-metallic handles may be used

To explain I would say: Suitable wear resisting steel is used to make gauging members of plain plug gauges. For heavy plain plug gauges, handle made of light metal alloys are used. For small plain plug gauges, suitable non-metallic handles may be used.