Question

Of the following, which ratio defines the etch factor?

(a) Etching depth to undercut

(b) Undercut to etching depth

(c) Undercut to mask area

(d) Mask area to undercut

I have been asked this question during an online interview.

I want to ask this question from Chemical Milling topic in section Chemical Processes of Advanced Machining

Answer 1

Correct choice is (b) Undercut to etching depth

The explanation: Etch factor is defined as the ratio of undercut to etching depth.