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A _________ door consists of a mild steel frame.(a) Louvered(b) Swing(c) Collapsible(d) RevolvingThe question was posed to me during an interview.This question is from Parts of Window topic in portion Doors, Windows and Ventilators of Construction & Building Materials

Answer» CORRECT choice is (C) COLLAPSIBLE

Easiest explanation: In Collapsible steel door, the two vertical pieces of mild steel CHANNELS, about 15 mm to 20 mm wide, are joined together with the hollow portion of the channel inside. A vertical gap of about 12 mm to 15 mm is thus created.


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