completely drain the boiler in an emergency
prevent sludge from forming in the drum
remove floating impurities from the boiler water surface
remove settled solids from the water drum
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when the boiler has been secured long enough for most solids to settleB.when the boiler has been cooled to ambient temperatureC.only after raising the water level to within 0.5 inch of the high water cutout onlyD.after bypassing the low pressure
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The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a ______．A.come-alongB.crossoverC.manifoldD.runaround
When installing a server in a rack， which of the following locations describes where in the rack a server should be installed？（）A、On the very bottom U of the rack， with the UPS above the serverB、In the middle of the rack to help balance the rackC、Closest to the bottom of the rack， above heavier equipmentD、On the very top U of the rack， with the UPS directly below it
单选题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.A seawater contaminationB frequent surface blowsC dissolved oxygen deaerationD frequent bottom blows
单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A relieve excess fuel oil pressure during the “off” fire cycleB admit water to the dry pipeC throttle the forced draft fan output for proper combustionD reduce excess steam pressure in the boiler
单选题Blow-off of the relief valves of the main cylinders during operation indicates （）.A the cylinder cover is crackedB the injector holes is cloggedC the cams are not properly setD fuel pump is leaking
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A The safety valve escape piping should be disconnected from the valve body and a blank insertedB The boiler vent valves should be openedC All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaksD All of the above
