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Which of the following constructions doesn’t use elliptical curves?

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Which of the following constructions doesn’t use elliptical curves?

(a) Cooling towers

(b) Dams

(c) Bridges

(d) Man-holes

I got this question in an internship interview.

I want to ask this question from Construction of Ellipse topic in chapter Geometrical Construction of Engineering Drawing

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The correct option is (a) Cooling towers

Explanation: Cooling towers, water channels use Hyperbolic curves as their design. Arches, Bridges, sound reflectors, light reflectors etc use parabolic curves. Arches, bridges, dams, monuments, man-holes, glands and stuffing boxes etc use elliptical curves.

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