Question

Why a revolution counter is used in dial gauge?

(a) To withstand sudden shock

(b) To indicate correctly the number of revolution

(c) To count and display the number of revolutions

(d) To transfer motion at right angle

The question was posed to me in an international level competition.

The question is from Working Mechanism of Dial Indicators topic in section Dial Indicators and Indicating Gauges of Engineering Metrology

Answer 1

Right option is (b) To indicate correctly the number of revolution

For explanation I would say: A revolution counter is present in dial gauge, if the pointer makes more than one revolution, it will correctly indicate the number of revolutions and enable a complete reading to be made when the indicator is used for direct measurement.