Question

While dimensioning holes, slots, etc. how would their number be specified?

(a) Number written on the dimension line

(b) Number is written of the leader line

(c) Number is written on the corner of page

(d) Number is written on the side of the hole or slot

This question was addressed to me in an international level competition.

Question is from System of Dimensioning topic in portion Lines, Lettering and Dimensioning of Engineering Drawing

Answer 1

Right choice is (a) Number written on the dimension line

To explain I would say: The number of holes, slots, etc. is written on the dimension line along with the dimensions. For example, if there are four holes of the same dimensions; then only one of the holes will have their dimensions specified and along with dimensions, the number is also written; 4Holes, φx mm.