Question

Which type of standard is UMM for calibration of hole location gauges?

(a) Primary standard

(b) Secondary standard

(c) Basic standard

(d) Reference standard

The question was posed to me during an interview.

My query is from Universal Measuring Machine in section Measuring Machines & Total Quality Management of Engineering Metrology

Answer 1

Right choice is (a) Primary standard

To explain: Universal measuring machine is a primary standard for calibration of hole location gauges. A hole-location gauge is calibrated on universal measuring machine and used to inspect a Co-ordinate measuring machine.