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When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and _____.
A.slightly acidic
B.slightly alkaline
C.no salty
D.slightly bitter
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单选题When collecting condensation for drinking water，（）.A
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单选题When you adjust a thermostatic expansion valve, （）.A
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all refrigerant must be routed through the dehydrator while changing the superheat setting
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单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）A
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单选题When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
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单选题Which statement concerning the collection of fresh water is FALSE?（）A
Fresh water may be obtained from fishB
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单选题Water fog from an all-purpose nozzle may be used to（）.A
fight an electrical fireB
fight a magnesium fireC
eliminate smoke from a compartmentD
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单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.A
shield fire fighters from radiant heatB
break up burning materialC
get the most water possible on the fireD
drive heat and smoke ahead of the fire fighters
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单选题Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）A
spray pipesB
demistersC
condensersD
splash baffles
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单选题Distilled water from an evaporator may be discharged into a potable water tank （）.A
through a detachable hose connectionB
after passing through an activated charcoal filterC
after chemical analysis shows it is fit for consumptionD
through a solenoid operated three-way valve
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单选题When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.A
slightly acidicB
slightly alkalineC
no saltyD
slightly bitter
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单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
to cut down the amount of cooling water neededB
to prevent an excess amount of cooling water from being discharged to the bilgesC
to supply hot water to the evaporator for more economical operationD
None of the above is tree
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单选题Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）A
The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuumB
The amount of heated feed water discharged from the feed water heater after cndenser is increasedC
Fewer non-condensable gases are created by the flow of colder seawaterD
More seawater is allowed to pass through the flint stage overflow weir
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单选题The purpose of an air compressor unloading device is to （）A
drain water from the air receiverB
drain water from the cylindersC
delay the compression process until the motor is up to speedD
check pump alignment
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单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
protect the compressor from liquid flood backB
protect the compressor from low discharge pressureC
start and stop the compressor upon system demandD
start the compressor after a drop in the evaporator pressure
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单选题When is the density of the water required to be logged in the logbook of a ship?（）A
Any time the vessel moves from water of one density into waters of a different densityB
Prior to getting underway when the vessel is floating in fresh or brackish waterC
Only when the vessel moves from fresh water into salt waterD
The density of the water is not required to be logged in the unofficial logbook
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单选题When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.A
disposeB
dissolveC
heatD
dissipates
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单选题The engine is started with （） supplied from air receivers.A
pressure oilB
pressure waterC
compressed airD
cooling water
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单选题When drinking from a well, one mustn’t forget _____ who dug it.A
themB
theseC
thatD
those
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单选题Which statement concerning the collection of fresh water is FALSE?（）A
Fresh water may be obtained from fishB
Lifeboat covers or canopies should be washed with rain before drinking water is collectedC
Fresh water may be collected from condensation inside the liferaftD
Seawater should never be consumed
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