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单选题
The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.
A
main stem stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
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单选题A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.A
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auxiliary steam stop valveC
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单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
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completely drain the boiler in an emergency situationC
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remove floating impurities from the oily water surface
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单选题A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?A
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blow through the cylinders and fuel lines with a drying agent
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单选题The donkey boiler may be given a bottom blow （）A
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考题
单选题The valve that prevents water from backing out of the boiler into the feed line is the（）.A
bottom-blow valveB
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feed-check valveD
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考题
单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
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单选题A centrifugal fuel oil purifier should be shut down if （）A
more sealing water is neededB
the cover clamp needs tighteningC
the purifier has a bad vibration when startedD
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考题
单选题Before the oily water separator put into operation, it should be （）A
filled with bilge waterB
filled with oilC
filled with clean waterD
be emptied
考题
单选题（） will be used to blow away soot and the combustion products from the tube surfaces.A
The blow down valveB
The scum valveC
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Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
Clogged air intake filters
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单选题If in doubt as to the true water level when a boiler is being oil-fired, you should （）.A
take no measuresB
extinguish the fire as soon as possibleC
feed water to the boilerD
open the blow down valve
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单选题How dose water enter the crankcase of a diesel engine?（）A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
Condensation from vapor formed in the expansion tank
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单选题Impurities from the boiler water surface can be removed through the （）.A
safety valveB
blow down valveC
scum valveD
feed check valve
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
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单选题Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）A
increase blow-by in all cylindersB
incomplete combustion in all cylinderC
overloading in all cylindersD
insufficient fuel delivery to all cylinders
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单选题If an operating auxiliary boiler has a water pH reading of 7, you should （）.A
bottom blow the boilerB
treat the water with caustic sodaC
treat the water with chemical scavengersD
reduce the water alkalinity to recommended readings
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