网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
A
steam stop valve
B
dry pipe
C
feedwater system
D
generating tubes
参考答案
参考解析
解析：
暂无解析
更多 “单选题In an auxiliary boiler steam and water system, the highest pressure will be in the （）.A steam stop valveB dry pipeC feedwater systemD generating tubes” 相关考题
考题
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler()
A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low
考题
The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler ______.A.steam demand is highB.salinity is highC.safety valve simmers(爆发)D.burner flame is extinguished
考题
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.A.high steam pressure in the boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity
考题
单选题The most common cause of scale formation in an auxiliary boiler is （）A
concentrations of calcium sulfate in the boiler waterB
fuel oil in the feed waterC
improper treatment of the feed water with calcium sulfateD
excessive feed water alkalinity
考题
单选题The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）A
in the event of a flame failureB
in the event of a stack fireC
when the water level reach the crown sheetD
when the feed pump discharge pressure drops to a preset minimum
考题
单选题The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.A
the formerB
the firstC
the latterD
the last
考题
单选题What is NOT a function of the steam drum of a marine water-tube boiler（）.A
Receives saturated steam from the generating tubesB
Serves as a reservoir of boiler feed waterC
Holds internal fittings for separation of moisture from steamD
Collects steam exhausted from the turbines
考题
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
考题
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）A
natural circulation of the water in the water tube boiler is better than that in the fire tube boilerB
for the same output the water tube boiler will carry less mass of water compared with the fire tube boilerC
the water tube boiler will cost shorter time for steam raisingD
the water tube boiler require lower skill in operating and maintaining
考题
单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
relight the boiler immediately to prevent loss of steam pressureB
relight the fire off the brickwork as the bricks are cherry redC
purge the furnace of any combustible gases before attempting to relight the fireD
speed up the feed pump to prevent dry firing when the burner flame is reestablished
考题
单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
operating the boiler at less than normal water levelB
installing fins on the firesides of water-tubesC
increasing the amount of excess air to the burnersD
treating the boiler water with chemical oxygen scavengers
考题
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）A
remove suspended and precipitated solids from the boiler waterB
completely drain the boiler in an emergency situationC
prevent hardened scale deposits in the water drumD
remove floating impurities from the oily water surface
考题
单选题The water in an auxiliary boiler should be tested daily for （）.A
dissolved oxygenB
chloridesC
sludgeD
dissolved nitrogen
考题
单选题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.A
monkeyB
donkeyC
waste heatD
main
考题
单选题A feed pump for an auxiliary boiler might lose suction if the （）.A
boiler water level is lowB
feedwater is too hotC
boiler steam demand is lowD
feedwater is too cold
考题
单选题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.A
ensure feed water flow into the boilerB
keep the steam drum pressure highC
prevent water hammer in the feed lineD
help the feed water flash to steam
考题
单选题The water level in a steaming auxiliary boiler will always （）A
rise when the steam pressure is increasedB
remain constant as long as the feed pump operatesC
fall when the steam pressure is decreasedD
vary as the steam demand changes
考题
单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）A
precipitate silica from solutionB
reduce corrosion in the heating coilC
prevent clogging and erosion in the coilD
maintain zero water hardness
考题
单选题Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）A
increased fuel consumptionB
increased feed water consumptionC
fuel pump failureD
combustion control system failure
考题
单选题（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.A
An economizerB
An attemperatorC
A water dramD
A down-comer tube
考题
单选题When steam is being raised on a boiler, the water level will normally （）.A
drop as the boiler warms upB
rise as the boiler warms upC
remain unchanged until the boiler is hot enoughD
rise and fall with the steam demand
考题
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.A
caustic embrittlement of the boiler metalB
acidic corrosion of the boiler metalC
hard scale deposits on the boiler tubesD
etching of the heat exchange surfaces
考题
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）A
completely drain the boiler in an emergencyB
prevent sludge from forming in the drumC
remove floating impurities from the boiler water surfaceD
remove settled solids from the water drum
考题
单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A
high steam pressure in the boilerB
abnormally high feed water temperatureC
abnormally high boiler water temperatureD
steam demand exceeding feed pump capacity
考题
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.A
check and regulate the water levelB
close the air cock once fires are litC
blowdown the gage glassD
crack the steam stop to assure protective steam flow
考题
单选题A donkey boiler is （）.A
one to supply steam to the main propulsion turbineB
an auxiliary boilerC
A and BD
neither A nor B
考题
单选题The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.A
hourB
dayC
weekD
month
热门标签
最新试卷