Question

How many contacts are present in internal dial gauges?

(a) 1 which is fixed

(b) 2, one fixed and other movable

(c) 3, two fixed and one movable

(d) 4, two fixed and two movable

I had been asked this question in an international level competition.

My doubt stems from Indicators Gauges in section Dial Indicators and Indicating Gauges of Engineering Metrology

Answer 1

The correct option is (c) 3, two fixed and one movable

Explanation: The internal dial gauge instrument has three contacts which are spaced equally along the circumference of the head. Out of three contacts, one is movable and the other two are fixed or non-movable type.