Question

What is the diameter of the contact point of a spindle in dial pipe gauge?

(a) 2.5 mm

(b) 3.5 mm

(c) 4.5 mm

(d) 5.5 mm

This question was posed to me during an interview.

The origin of the question is Indicators Gauges topic in section Dial Indicators and Indicating Gauges of Engineering Metrology

Answer 1

The correct choice is (a) 2.5 mm

Easy explanation: Dial pipe gauge is specially used for easy measurement of pipe’s wall thickness. It is a dial thickness gauge. Diameter of a contact point of the spindle is 2.5 mm. Minimum measurable inside diameter of pipe is about 3.5 mm.