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单选题
The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）
A
will be modulated in proportion
B
will be modulated in proportion and integral
C
will be modulated in proportion and differential
D
will not be modulated at all
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考题
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
考题
The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.A.lower thanB.higher thanC.belowD.equal to
考题
In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside.
A.water-tubeB.fire-tubeC.exhaust gasD.composite
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 effect that exhaust gas recirculation can reduce NOX formation is partly due to a reduction of the()concentration in the combustion zone and partly due to the content of water and carbon dioxide in the exhaust gas.A.OxygenB.NitrogenC.SulphurD.Freon
考题
A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold
考题
The water level showing in a boiler water gauge glass is usually ( ) duringworking.A.higher than the actual drum water levelB.equal to the actual drum water levelC.increasing due to steam condensation in the glassD.lower than actual drum wafer level
考题
In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite
考题
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.A.gas compositionB.gas temperatureC.pressureD.timing
考题
Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
考题
单选题The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.A
the oil separatorB
the fresh water generatorC
the compressorD
fire pump
考题
单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）A
reduce heat radiation to the engine roomB
aid in preventing turbocharger overheatingC
condense and drain moisture from exhaust gasesD
dampen exhaust gas pulsations in the manifold
考题
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
the temperature and flow quantity of the exhaust gas from M.EB
the quantity of steam demandedC
the rotary speed and the cooling water temperature of main engineD
efficiency of M.E turbocharger
考题
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.A
bypass exhaust gas at high loads to prevent excessive back pressureB
bypass a portion of the exhaust gas at peak loads for better efficiencyC
recycle exhaust gas to the turbochargerD
minimize moisture condensation in the boiler gas passages at low loads
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Diesel engine exhaust noise can be reduced in an exhaust muffler by （）A
changing the direction of exhaust gas flowB
increasing the exhaust gas velocityC
changing the exhaust gas weightD
increasing the exhaust gas static pressure
考题
单选题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
考题
单选题When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.A
swellB
shrinkageC
flash offD
lack of water
考题
单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A
firing for extended periods in the low fire modeB
overheating, due to waterside depositsC
varying the water level above the crown sheetD
carrying excessive alkalinity in the boiler water
考题
单选题At normal sea going, we use （） instead of donkey boiler.A
a heaterB
a pre-heaterC
an exhaust gas boilerD
the coal burning boiler
考题
单选题Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.A
carry offB
carry downC
carry onD
carry over
考题
单选题The water level showing in a boiler water gauge glass is usually （） during working.A
higher than the actual drum water levelB
equal to the actual drum water levelC
increasing due to steam condensation in the glassD
lower than actual drum water level
考题
单选题The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.A
wheneverB
howeverC
whereverD
whether
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The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.A
lower thanB
higher thanC
belowD
equal to
考题
单选题When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.A
lower thanB
higher thanC
as much asD
the same as
考题
单选题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）A
the temperature and flow quantity of the exhaust gas from M/EB
the quantity of steam demandedC
the rotary speed and the cooling water temperature of main engineD
efficiency of M/ turbocharger
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