Question

Which of the following is incorrect about the precision scale?

(a) Precision scale of reference standard is of a H section

(b) Fine lines are engraved parallel to the longitudinal axis of the bar

(c) Lines are engraved by using ruling engine

(d) Lines are scribed with a sharp diamond cutter

The question was asked during an interview for a job.

Enquiry is from Line Standard in section Standards of Measurements of Engineering Metrology

Answer 1

Right option is (b) Fine lines are engraved parallel to the longitudinal axis of the bar

The best I can explain: Fine lines are engraved at 90^o to the longitudinal axis of the bar. Lines should be as fine as possible. Taking care of lines in terms of parallelism, uniform thickness and spacing is really important.