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单选题
Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A
sulfite or hydrazine
B
sulfite or hygroscopic sulfite
C
bromide or hydrazine
D
bromide or hygroscopic sulfite
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If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger
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When anaerobic bacteria convert the sewage to an inert sludge, .A.no oxygen is neededB.oxygen is necessaryC.oxygen is given offD.no gas is produced
考题
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
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A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
考题
Chafing gear ______.A.reduces and prevents corrosion of standing riggingB.prevents corrosion of running riggingC.reduces and prevents wear caused by the rubbing of one object against anotherD.protects the body against extreme cold
考题
Deficient oxygen content inside a chain locker can be detected with ______.A.litmus paperB.a combustible gas indicatorC.an oxygen breathing apparatusD.an oxygen indicator
考题
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
考题
单选题The spread of fire is NOT prevented by（）.A
shutting off the oxygen supplyB
cooling surfaces adjacent to the fireC
removing combustibles from the endangered areaD
removing smoke and toxic gases by ensuring adequate ventilation
考题
单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）A
prevent engine back pressure at heavy loadsB
increase total engine efficiency at low loadsC
prevent boiler corrosion at low engine loadsD
improve engine fuel consumption at any load
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Which command would correctly start a TSPITR of the USERS tablespace？（）A
recover tablespace users until time ，，10/06/2008：22：42：00 auxiliary ，，c/oracle/auxiliaryB
recover tablespace users time ，，10/06/2008：22：42：00 auxiliary destination ，，c：/oracle/auxiliary； time ，， 10/06/2008：22：42：00 auxiliary destination ，，c/oracle/auxiliaryC
recover tablespace users to point-in.D
recover tablespace users except time ，，10/06/2008：22：42：00 auxiliary destination ，，c：/oracle/auxiliaryE
recover tablespace users until time ，，10/06/2008：22：42：00 auxiliary destination ，，c：/oracle/auxiliary
考题
单选题Chafing gear（）.A
reduces and prevents corrosion of standing riggingB
prevents corrosion of running riggingC
reduces and prevents wear caused by the rubbing of one object against anotherD
protects the body against extreme cold
考题
单选题Deficient oxygen content inside a chain locker can be detected with（）.A
litmus paperB
a combustible gas indicatorC
an oxygen breathing apparatusD
an oxygen indicator
考题
单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）A
High oxygen concentrationB
Low pHC
Proper alkalinityD
All of the above
考题
单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）A
cavitation erosion in the water jacketsB
excess corrosion inhibitor in the coolantC
dirty jacket water coolerD
defective turbocharger
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The procedures recommended for auxiliary boilers having high salinity include （）.A
treating with oxygen scavengersB
securing the boiler and giving it a blowing downC
increasing the pHD
reducing the phosphate level
考题
单选题Auxiliary boilers can be classified as（）A
water-tube natural circulation boilersB
fire-tube boilersC
water-tube forced circulation boilersD
all of the above
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Auxiliary boilers are divided into several classifications, one of which is（）A
fire-tube controlled circulationB
fire-tube supercritical circulationC
water-tube natural circulationD
water-tube express circulation
考题
单选题Who is in charge of the auxiliary boilers?（）A
The chief engineerB
The second engineerC
The third engineerD
The fourth engineer
考题
单选题The spread of fire is prevented by（）.A
cooling surfaces adjacent to the fireB
leaving combustibles in the endangered areaC
increasing the oxygen supplyD
All of the above
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