1) Why should you insulate copper pipes a) Prevent the copper pipes rusting  b) Prevent heat loss c) Prevent the pipes from getting damaged d) Prevent heat transfer 2) What colour are central heating pipes a) white b) red c) blue d) orange 3) what colour are gas pipes a) green b) yellow c) blue d) red 4) Bending pipes instead of using fittings causes less frictional resistance a) True b) False 5) What is and X dimension a) centre of the pipe b) centre of fitting to engaged length c) length between end of pipe to start of the fitting 6) What percentage of Low carbon steel is carbon a) 0.15% b) 1% c) 0.25% d) 0.55 7) What is medium grade LCS used for a) Gas b) steam and fire systems c) heating and oil lines 8) What colour LCS is used for gas a) Red b) Yellow c) Blue d) Brown 9) Which one of these isn't used for protecting LCS pipes a) Denso tape b) Paint c) PTFE sheets d) fibreglass tape 10) What is the most common type of copper used in domestic dwellings a) R250 b) R220

plumbing processes

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