Power Engineering 4B Book 4 Boiler Plant operation | 112 Questions with 100 % correct answers | Verified

d - The most important rule in safe operation of a steam boiler is to a) keep the heat transfer surfaces clean b) maintain the boiler room log c) try to keep make up water to a minimum d) keep water in the boiler at the proper level c - in a multiple boiler high pressure steam plant , when starting an entire system from cold a) all boilers are started and warmed at the same time b) boilers remaining off-line must have their boiler and header stop valves open, and their non-return drain valves shut c) the entire system warms and pressurizes as one boiler warms, except for the boilers remaining off-line d) a small auxiliary heating boiler is used to warm the steam lines while the power boilers are warming d - deaerators often have low level alarms and low-low level trips a) in case of boiler trips b) in case the boiler feed water valve fails open c) in case the boiler feed water pumps trip d) in case the condensate transfer pumps trip c - boilers should be warmed up a) with maximum combustion air , to prevent smokingb) rapidly, so the metal heats up faster c) slowly, to minimize differential expansion and thermal shock d) using only the pilot burner c - Before performing a try lever test on a power boiler, what pressure should the boiler be at a) the boiler MAWP b) the set pressure of the safety valve c) at least 75% of the set pressure of the safety valve d)at or above 750kPa c - when closing up a boiler a) handhole and manhole gaskets must be coated with a sealant, such as graphite paste or silicone b) handhole and manhole gaskets should be reused , because they are expensive c) new handhole and manhole gaskets must be used, to prevent major blowouts and costly unplanned boiler outages d) handhole and manhole yolks must be torqued until the gaskets are compressed to less than 1mm thick d - On a semi-automatic ignition system, the switch on the supervised cock