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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
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更多 “单选题A refrigerant with oil in solution has a （）.A higher boiling temperature for a given pressure than does a pure refrigerantB lower boiling temperature for a given pressure than does a pure refrigerantC boiling pressure equal to that of a pure refrigerant at a given pressureD boiling point will not be affected by entrained oil” 相关考题
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
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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
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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
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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
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The Norwegian Government has tried to ______.A. encourage the oil companies to discover new oil sources
B. prevent oil companies employing people from northern Norway
C. help the oil companies solve many of their problems
D. keep the oil industry to something near its present size
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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
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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
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单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.A
contaminated with sludgeB
contaminated with carbonC
diluted with fuel oilD
diluted with water
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A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.A
a shortage of refrigerant in the systemB
air in the systemC
an accumulation of liquid refrigerant in the crankcaseD
a shortage of oil in the crankcase
考题
单选题Refrigeration system compressor crankcase sweating is an indication of （）.A
insufficient lube oil circulating through the systemB
excessive circulation of lube oil through the systemC
insufficient refrigerant in the systemD
an overworked compressor
考题
单选题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.A
additivesB
waterC
greaseD
acid solution
考题
单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.A
open the bypass lineB
cut in the lube oil coolerC
pressurize the lube oil systemD
top off the expansion tank
考题
单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
filter to remove the fuel oilB
use the settler to remove the fuel oilC
remove the fuel oil by centrifugingD
drain and then renew the lube oil supply
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Foaming of the oil in a refrigeration compressor crankcase is caused by （）.A
refrigerant boiling out of solution from the lube oilB
liquid refrigerant flooding the compressor and systemC
lube oil viscosity being reduced by refrigerant dilutionD
compressor suction pressure suddenly increasing
考题
单选题Moisture in the refrigerant may （）.A
freeze on the expansion valve seat and reduce the flow of liquid refrigerantB
emulsify the oil in the condenserC
freeze in the king valveD
clog the oil trap
考题
单选题Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by （）.A
sounding the tankB
waiting for the vessel to listC
examining tank boundariesD
checking fuel oil strainers
考题
单选题When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.A
air from contacting the oil vaporsB
permitting re-ignition boiling of the heated oilC
spontaneous combustion below the oil surfaceD
toxic fumes from escaping to the surface
考题
单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
cause the refrigerant pressure to fall
考题
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）A
At the designed operating temperature, the liquid refrigerant charge has changed to a vaporB
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
考题
单选题A centrifugal compressor’s purge recovery unit（）A
reclaims waterB
purges air without losing refrigerantC
purges air with some loss of refrigerantD
purges lube oil from the refrigerant
考题
单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some refrigerant from the system
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If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.A
acidity has increasedB
viscosity has decreasedC
demulsibility has improvedD
foaming is guaranteed to occur
考题
单选题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
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