Question

From which category ‘Sigma comparator’ belongs?

(a) Optical comparator

(b) Mechanical comparator

(c) Mechanical-optical comparator

(d) Pneumatic comparator

This question was posed to me in an interview for job.

My question is from Uses of Comparators topic in division Comparators of Engineering Metrology

Answer 1

The correct answer is (b) Mechanical comparator

Explanation: Sigma comparator is a mechanical comparator. Components of sigma comparator are a plunger, knife edge, cross strip hinge, Y-shaped arm, driving drum, slit diaphragm, a scale and a pointer etc.