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Unit of dimensions for ballast is __________(a) cm(b) micro m(c) mm(d) cu mThis question was addressed to me during an interview for a job.Enquiry is from Sizes and Dimensions of Various Works in MKS and FPS topic in chapter Nomography, Computer Aided Drafting & Procedure of Estimating of Civil Engineering Drawing

Answer»

Correct option is (c) mm

Easy explanation: Track ballast forms the track bed upon which railroad ties (sleepers) are laid. It is packed between, below, and around the ties. It is used to BEAR the load from the railroad ties, to facilitate drainage of water, and ALSO to keep down vegetation that might interfere with the track structure. This also serves to hold the track in place as the trains ROLL by. It is typically made of crushed stone, although ballast has sometimes consisted of other, less suitable materials, for example BURNT clay. The term “ballast” comes from a NAUTICAL term for the stones used to stabilize a ship.


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