网友您好, 请在下方输入框内输入要搜索的题目:
题目内容
(请给出正确答案)
单选题
Air or noncondensable gas is removed from a refrigeration system by a ()
A
separating chamber
B
system of baffles
C
purge valve
D
vacuum reducing valve
参考答案
参考解析
解析:
暂无解析
更多 “单选题Air or noncondensable gas is removed from a refrigeration system by a ()A separating chamberB system of bafflesC purge valveD vacuum reducing valve” 相关考题
考题
Any open flame can’t exist in this business buildingA.Yes. We’ve removed all the flammable gas.B.Yes. We’ve searched everywhere for flammable liquidC.Yes. All the flammable liquid and gas have been removed already.D.Yes. We’ve removed all the liquid, gas and wood which can be burned
考题
Moisture is removed from a refrigeration system byA.bleeding refrigerant from the condenserB.opening a drain petcock on the oil separatorC.condensing the water in the heat exchangerD.using a dehydrator cartridge
考题
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine byA.natural aspirationB.masked intake valvesC.air ceilsD.scavenging air
考题
In an air conditioning system, moisture is removed from the air by ______.A.filtersB.separatorsC.ducted trapsD.dehumidifiers
考题
The fresh air intake of the inert gas system ______,A.Prevents the flue gas from falling below 3% content of oxygenB.Allows the inert gas piping to be used for gas freeing the tanksC.Opens when there is excessive vacuum on the deck water sealD.Enables outside air to mix with and cool hot flue gasses
考题
Gas masks ______.A.should be worn while fighting a fireB.can be used in atmospheres deficient in oxygenC.filter contaminants from air that is to be breathedD.may be substituted for a self-contained breathing apparatus
考题
单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by()A
natural aspirationB
masked intake valvesC
air cellsD
scavenging air
考题
单选题Hot gas defrosting uses the hot gas from () to defrost the evaporator.A
starting air bottlesB
diesel enginesC
boilersD
refrigeration compressors
考题
单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? ()A
De-energizes the charged mist effectB
Maintains a positive pressure on the vent header to cool the flammable vaporsC
Inert gas filters out the flammable vapors from the cargo tank spacesD
Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
考题
单选题The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the ().A
sudden evaporation of wax crystals in the lubricantB
sudden evaporation of entrapped air in the lubricantC
release of refrigerant from the oil/refrigerant mixtureD
release of dissolved lubricant from the refrigerant
考题
单选题The fresh air intake of the inert gas system().A
prevents the flue gas from falling below 3% content of oxygenB
allows the inert gas piping to be used for gas freeing the tanksC
opens when there is excessive vacuum on the deck water sealD
enables outside air to mix with and cool hot flue gasses
考题
单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the ()A
latent heat of expansionB
sensible heat of condensationC
heat of compressionD
all of the above
考题
单选题In a compression refrigeration plant the refrigerant flows from the expansion valve and through the () where it absorbs heat from the space being cooled and becomes a gas or vapor.A
compressorB
condenserC
throttle valveD
evaporator
考题
单选题Gas masks().A
should be worn while fighting a fireB
can be used in atmospheres deficient in oxygenC
filter contaminants from air that is to be breathedD
may be substituted for a self-contained breathing apparatus
考题
单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?()A
Latent heat of vaporizationB
Heat of compressionC
SuperheatD
All of the above
考题
单选题In an air conditioning system, moisture is removed from the air by()A
filersB
separatorsC
ducted trapsD
dehumidifiers
考题
单选题Moisture is removed from a refrigeration system by().A
bleeding refrigerant from the condenserB
opening a drain petcock on the oil separatorC
condensing the water in the heat exchangerD
using a dehydrator cartridge
考题
单选题The purpose of inert gas systems aboard tankers is to().A
allow sufficient oxygen in the tank to sustain lifeB
prevent outside air from entering the tankC
provide more discharge pressureD
comply with pollution regulations
考题
单选题Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas from the cylinder in a process known as “()”.A
chargingB
super chargingC
scavengingD
exhausting
考题
单选题()are supplied by main switchboard directly.A
Suez Canal searchlight, air compressor and air conditioning compressorB
Air compressor, boiler blower and refrigeration plantC
Boiler blower, Suez Canal searchlight and refrigeration plantD
Suez canal searchlight, air compressor and boiler blower
考题
单选题A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means ().A
the system is fully chargedB
there is air leaking in from the condenserC
ice crystals are forming in the refrigerantD
the system contains less than a full charge of refrigerant
考题
单选题Directional intake ports in diesel engines are used to ().A
reduce air charge turbulenceB
induce air swirlC
deflect hot combustion gas away from the valvesD
oppose the effects of piston induced squish
考题
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to ().A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
考题
单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()A
purge lube oil from the liquid refrigerantB
recover water purged from the systemC
separate foul gases from the receiverD
purge non-condensable gases without losing refrigerant
考题
单选题At the instant when a string of casing being run from a ship is landed in the well head,().A
the total weight in air of the casing string is removed from the shipB
the hook load (weight of the casing string) is removed from the shipC
the weight of the casing inside the riser is removed from the shipD
the weight of the casing string added to the weight of the fill-up mud is removed from the ship
考题
单选题When a magnetic compass is not in use for a prolonged period of time it should().A
be shielded from direct sunlightB
be locked into a constant headingC
have any air bubbles replaced with nitrogenD
have the compensating magnets removed
考题
单选题A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement,you may use().A
a gas mask certified by the Mine Safety and Health AdministrationB
the same self-contained breathing apparatus required with the fireman's outfitC
an oxygen breathing apparatus,provided that the device has been inspected within three yearsD
a portable ventilation system that will provide a complete change of air every three minutes
热门标签
最新试卷