Question

Which of the following is not correct about plain gauges?

(a) Used to check threaded portions

(b) There is no scale in plain gauges

(c) Indicates actual value of the inspected dimension

(d) Can be used to check dimension of manufactured part

I have been asked this question by my college professor while I was bunking the class.

This question is from Plain Gauges topic in chapter Limits, Fits and Gauges of Engineering Metrology

Answer 1

Correct answer is (c) Indicates actual value of the inspected dimension

The best explanation: These gauges do not have any scale. These gauges are used only for determining that the inspected part is within a specified limit or not. They do not use to indicate actual value. Plain gauges are mostly used to check unthreaded shafts and holes.