Question

What is the value of total error for grade 1 micrometer when micrometer is tested at 20oC?

(a) 4+(L/100)µm

(b) 5+(L/100)µm

(c) 6+(L/100)µm

(d) 7+(L/100)µm

I have been asked this question during an interview for a job.

Origin of the question is Micrometers topic in chapter Linear Measurements of Engineering Metrology

Answer 1

Correct answer is (a) 4+(L/100)µm

Explanation: Total error should not exceed  4+(L/100)µ m for ‘grade 1’ micrometer and 10+(L/50)µm for ‘grade 2’ micrometer when tested at 20^oC.