单选题A refrigerant with oil in solution has a （）.Ahigher boiling temperature for a given pressure than does a pure refrigerantBlower boiling temperature for a given pressure than does a pure refrigerantCboiling pressure equal to that of a pure refrigerant at a given pressureDboiling point will not be affected by entrained oil
单选题
A refrigerant with oil in solution has a （）.
A
higher boiling temperature for a given pressure than does a pure refrigerant
B
lower boiling temperature for a given pressure than does a pure refrigerant
C
boiling pressure equal to that of a pure refrigerant at a given pressure
D
boiling point will not be affected by entrained oil
参考解析
解析：
暂无解析
相关考题：
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
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.A.refrigerant bubbles in the lube oilB.refrigerant reducing the lube oil viscosityC.oxidation(氧化) of the lube oil from overheatingD.reducing the floc or cloud point of the oil
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.A.carbon deposits on the compressor suction valvesB.the evaporator temperature to increaseC.rapid corrosion of the thermal expansion valveD.no operating problems
The requirement to carry an Oil Record Book does not apply to a ship that ______.A.is not equipped to discharge overboard any oil or oily mixtureB.is on an international voyage to a country that is a party to MARPOLC.has an International Oil Pollution Prevention CertificateD.has an oily water separator of sufficient capacity for the oil wastes generated
The Norwegian Government has tried to ______.A. encourage the oil companies to discover new oil sourcesB. prevent oil companies employing people from northern NorwayC. help the oil companies solve many of their problemsD. keep the oil industry to something near its present size
A section of the building has been having intermittent connectivity problems lately. An action plan and solution has been created. Which of the following steps would an administrator perform NEXT?（）A、Document the solution and process.B、Establish the most probable cause.C、Implement and test the solution.D、Identify additional symptoms and problems
A solution provider has proposed a pSeries solution to a new customer. The solution is complex with a number of technologies that are new to the customer. They have a tight timeline for implementation. The solution provider has not been able to get a clear understanding as to how the customer will backup the system. What would be the most appropriate action to address the risks with this solution？（）A、Sell SysbackB、Conduct a SARC、Sell SupportlineD、Provide a project timeline
单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.Acontaminated with sludgeBcontaminated with carbonCdiluted with fuel oilDdiluted with water
单选题The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.Asudden evaporation of wax crystals in the lubricantBsudden evaporation of entrapped air in the lubricantCrelease of refrigerant from the oil/refrigerant mixtureDrelease of dissolved lubricant from the refrigerant
单选题A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.Aa shortage of refrigerant in the systemBair in the systemCan accumulation of liquid refrigerant in the crankcaseDa shortage of oil in the crankcase
单选题Refrigeration system compressor crankcase sweating is an indication of （）.Ainsufficient lube oil circulating through the systemBexcessive circulation of lube oil through the systemCinsufficient refrigerant in the systemDan overworked compressor
单选题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.AadditivesBwaterCgreaseDacid solution
单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.Aopen the bypass lineBcut in the lube oil coolerCpressurize the lube oil systemDtop off the expansion tank
单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.Afilter to remove the fuel oilBuse the settler to remove the fuel oilCremove the fuel oil by centrifugingDdrain and then renew the lube oil supply
单选题Moisture is removed from a refrigeration system by（）.Ableeding refrigerant from the condenserBopening a drain petcock on the oil separatorCcondensing the water in the heat exchangerDusing a dehydrator cartridge
单选题Foaming of the oil in a refrigeration compressor crankcase is caused by （）.Arefrigerant boiling out of solution from the lube oilBliquid refrigerant flooding the compressor and systemClube oil viscosity being reduced by refrigerant dilutionDcompressor suction pressure suddenly increasing
单选题Moisture in the refrigerant may （）.Afreeze on the expansion valve seat and reduce the flow of liquid refrigerantBemulsify the oil in the condenserCfreeze in the king valveDclog the oil trap
单选题A refrigerant with oil in solution has a （）.Ahigher boiling temperature for a given pressure than does a pure refrigerantBlower boiling temperature for a given pressure than does a pure refrigerantCboiling pressure equal to that of a pure refrigerant at a given pressureDboiling point will not be affected by entrained oil
单选题Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by （）.Asounding the tankBwaiting for the vessel to listCexamining tank boundariesDchecking fuel oil strainers
单选题When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.Aair from contacting the oil vaporsBpermitting re-ignition boiling of the heated oilCspontaneous combustion below the oil surfaceDtoxic fumes from escaping to the surface
单选题The thermostatic valve has a throttling action, that is to say the valve can（）Astop the refrigerant from flowingBforce the refrigerant to flowCcause the refrigerant pressure to riseDcause the refrigerant pressure to fall
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions
单选题A centrifugal compressor’s purge recovery unit（）Areclaims waterBpurges air without losing refrigerantCpurges air with some loss of refrigerantDpurges lube oil from the refrigerant
单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.Aincrease the amount of cooling water to the condenserBdecrease the amount of cooling water to the condenserCadd more refrigerant to the systemDremove some refrigerant from the system
单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）Apurge lube oil from the liquid refrigerantBrecover water purged from the systemCseparate foul gases from the receiverDpurge non-condensable gases without losing refrigerant
单选题If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.Aacidity has increasedBviscosity has decreasedCdemulsibility has improvedDfoaming is guaranteed to occur
单选题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.Acarbon deposits on the compressor suction valvesBthe evaporator temperature to increaseCrapid corrosion of the thermal expansion valveDno operating problems