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Which of the following constructions use parabolic curves?

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Which of the following constructions use parabolic curves?

(a) Cooling towers

(b) Water channels

(c) Light reflectors

(d) Man-holes

I had been asked this question in exam.

This key question is from Construction of Parabola topic in chapter Geometrical Construction of Engineering Drawing

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The correct answer is (c) Light reflectors

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

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