Question

Which of the following is best gauge/machine to inspect the parallel screw ring gauges?

(a) Hand micrometer

(b) Plug check gauges

(c) Comparators

(d) Bench micrometer

The question was asked by my school teacher while I was bunking the class.

Query is from Measurements of Limit Gauges topic in portion Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

Answer 1

Right option is (c) Comparators

To elaborate: Screw ring gauges inspection by plug check gauges verifies that the ring gauges lie between their size limits. The major diameters are measured by inspection of the thread form which provides an indirect verification.