Question

Which of the following statement is true for dial indicators?

(a) It can be used as a direct measuring instrument

(b) It can only be used as a comparator

(c) There is no effect on accuracy if the surface of contact point worn out

(d) Test for repeatability is done only once at the starting

This question was posed to me in a job interview.

My enquiry is from General Care of Dial Gauges in section Dial Indicators and Indicating Gauges of Engineering Metrology

Answer 1

Correct option is (b) It can only be used as a comparator

Easy explanation: Dial gauges are only used as comparators and should not be used as direct measuring instruments. It provides only relative measurement. These are used to check consistency and accuracy in manufacturing processes.