Question

Parabolic curves is not used in ________

(a) Arches

(b) Bridges

(c) Sound reflectors

(d) Boring

I have been asked this question by my college director while I was bunking the class.

I need to ask this question from Curves Used in Engineering Practice topic in chapter Lettering Practice, Scales & Curves of Civil Engineering Drawing

Answer 1

Right answer is (d) Boring

For explanation I would say: Mostly used in construction and also for converging or diverging light since radiation often needs to be concentrated at one point (e.g. radio telescopes, pay TV dishes, solar radiation collectors) also to be transmitted from a single point into a wide parallel beam (e.g. headlight reflectors). Boring uses single point cutting tools which are straight vertical shaped.