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
An increase in the heat load to a refrigeration system will cause ().
A
the suction pressure to decrease
B
the suction temperature to increase
C
increased ice formation on the evaporator coil
D
excessive short cycling of the compressor
参考答案
参考解析
解析:
暂无解析
更多 “单选题An increase in the heat load to a refrigeration system will cause ().A the suction pressure to decreaseB the suction temperature to increaseC increased ice formation on the evaporator coilD excessive short cycling of the compressor” 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
考题
Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system
考题
Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
考题
An increase in the heat load to a refrigeration system will cause ______.A.the suction pressure to decreaseB.the suction temperature to increaseC.increased ice formation on the evaporator coilD.excessive short cycling of the compressor
考题
Which CLI command is used to upgrade a Juniper router?()A、load packageB、load override terminalC、request system software addD、request system software upgrade
考题
单选题Low compressor head pressure in a refrigeration system can be caused by().A
insufficient condenser cooling waterB
excessive condenser cooling waterC
air in the refrigeration systemD
excessive refrigerant in the system
考题
单选题The spreading of fire as a result of heat being carried through a vessels ventilation system, is an example of heat transfer by ().A
conductionB
convectionC
radiationD
windage
考题
单选题The latent heat of evaporation is dissipated in the () in a compression refrigeration system.A
evaporatorB
condenserC
expansion valveD
compressor
考题
单选题Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?()A
Baffle plates that have been bent during prior removalB
Leaks in the cooler tube nestC
Operating the engine while maintaining a high sea water outlet temperatureD
A punctured sea water strainer supplying cooling water to the heat exchanger
考题
单选题What is the purpose of sub cooling R-12 in the condenser?()A
to increase the system efficiency by sensible heat transferB
to stop the liquid from flashingC
to reduce the load on the compressorD
to remove latent heat of vaporization and the suction piping transfer
考题
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the().A
compressorB
condenserC
receiverD
evaporator
考题
单选题When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be ().A
dehydratedB
purgedC
pluggedD
evacuated
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The function of () in a refrigeration plant using Freon is to move moisture from all refrigeration system.A
filterB
filter drierC
heat exchangerD
air cooler
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Since heat will not flow freely from a body at a () temperature to another at a () temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.A
lower;higherB
shallower;deeperC
larger;smallerD
higher;lower
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Zinc rods are installed in the refrigeration system ().A
liquid strainerB
liquid receiverC
saltwater condenserD
evaporator
考题
单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ().A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD
maintaining a high pressure on the systems receiver
考题
单选题The rate of heat transfer from a hot region to a cold region is affected most by the ().A
size of the heat sinkB
temperature difference between the regionsC
size of the heat sourceD
total heat of the system
考题
单选题Refrigerant is circulated through a refrigeration system by the ().A
compressorB
condenserC
expansion valveD
evaporator
考题
单选题Moisture in a refrigeration system can cause ().A
freezing the expansion valve closedB
corrosion of system pipingC
improper temperature regulationD
all of the above
考题
单选题When the heat load begins to increase, the needle valve of an expansion valve will()A
move in an opening directionB
move in a closing directionC
either open or closeD
not move at all
考题
单选题A solenoid valve used in a refrigeration system should be installed ().A
with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveB
upright, sensing temperature of the box, and upstream of the thermal expansion valveC
upright, sensing temperature of the box, and downstream of the thermal expansion valveD
upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
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Which of the listed refrigeration system components keeps the refrigerant circulating through the system?()A
Expansion valveB
CondenserC
EvaporatorD
Compressor
考题
单选题Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()A
Thermal expansion valve frozen openB
Suction gas heat exchanger bypassedC
Condenser clogged or fouledD
High pressure cutout switch inoperative
热门标签
最新试卷