Question

Which of the following is correct about vernier height gauges?

(a) The scriber should preferably be of more depth than jaw

(b) The perpendicular distance between scale graduations and vernier graduations should be more than 0.01 mm

(c) The base is lapped up to an accuracy of 0.05 mm

(d) Width of interval between adjacent lines should be 1/2 or 1/3 times of the length of shortest graduations

The question was asked in final exam.

My query is from Vernier Height Gauges topic in portion Linear Measurements of Engineering Metrology

Answer 1

Correct answer is (d) Width of interval between adjacent lines should be 1/2 or 1/3 times of the length of shortest graduations

Best explanation: Nominal depth of scriber should be same as measuring jaw so that it can be reversed.  The base is ground and lapped up to 0.005 mm of accuracy and for this total span of a surface is considered.