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Explain the Statements about the Differential Levelling
I. Bench mark (BM) - relatively permanent point of known elevation as indicated on the Contract drawings
II. Back sight (BS) - a sight taken to the level rod held at a point of known elevation (either BM or TP)
III. Height of Instrument (HI) - the elevation of the line of sight of the telescope
IV. Foresight (FS) - a sight taken on any point to determine its elevation
characteristics of ridge characteristics of escarpment characteristics of plateau characteristics of knoll characteristics of conical hill
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Q. Explain Hot weather Patrolling ? Hot weather Patrolling is done for LWR and CWR tracks when the rail temperature reaches td + 20 0 C and above and td + 14 0 C for Central
Q. Use of PFA and GGBS? Both PFA and GGBS are by-products of industry and use of them is ecologically friendly. Most significantly, with PFA and GBS adopted as partial replacem
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