单选题Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）Asulfite or hydrazineBsulfite or hygroscopic sulfiteCbromide or hydrazineDbromide or hygroscopic sulfite
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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单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBa combustible gas indicatorCan oxygen breathing apparatusDan oxygen indicator
单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）AHigh oxygen concentrationBLow pHCProper alkalinityDAll of the above
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 （）Acavitation erosion in the water jacketsBexcess corrosion inhibitor in the coolantCdirty jacket water coolerDdefective turbocharger
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（）Aprecipitate silica from solutionBreduce corrosion in the heating coilCprevent clogging and erosion in the coilDmaintain zero water hardness
单选题The procedures recommended for auxiliary boilers having high salinity include （）.Atreating with oxygen scavengersBsecuring the boiler and giving it a blowing downCincreasing the pHDreducing the phosphate level
单选题Auxiliary boilers can be classified as（）Awater-tube natural circulation boilersBfire-tube boilersCwater-tube forced circulation boilersDall of the above
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.Acaustic embrittlement of the boiler metalBacidic corrosion of the boiler metalChard scale deposits on the boiler tubesDetching of the heat exchange surfaces
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）Acompletely drain the boiler in an emergencyBprevent sludge from forming in the drumCremove floating impurities from the boiler water surfaceDremove settled solids from the water drum
单选题Auxiliary boilers are divided into several classifications, one of which is（）Afire-tube controlled circulationBfire-tube supercritical circulationCwater-tube natural circulationDwater-tube express circulation
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