Question

Which of the following grades is specified by IS: 2494-1964?

(a) Two grades of vee Blocks, viz. Grade A and B

(b) Four grades of vee Blocks, viz. Grade A, B, C and D

(c) Two grades of vee Blocks, viz. Grade 1 and 2

(d) Four grades of vee Blocks, viz. Grade 1, 2, 3 and 4

I had been asked this question in exam.

This key question is from V-Block in section Linear Measurements of Engineering Metrology

Answer 1

The correct option is (c) Two grades of vee Blocks, viz. Grade 1 and 2

The explanation is: Depending upon the accuracy there are two grades (grade A and grade B) are specified by IS: 2494-1964. Vee blocks should check periodically to correct inaccuracies in blocks if any.