更多"A pressure drop through the refrige"的相关试题:
[单项选择]A pressure drop in the liquid line of a refrigeration system may cause（）
A. the solenoid valve to seize
B. the compressor to hunt
C. flash gas to form in the liquid line
D. the expansion valve to freeze open
[单项选择]Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.
A. positive displacement
B. ejector
C. centrifugal
D. air compressor
[单项选择]What type of liquid is used in the liquid P/V breaker（）.
A. Hydraulic oil
B. Water-antifreeze mixture
C. Distilled water
D. Oil from the cargo
[判断题]LIN总线主控制单元连接在CAN数据总线上，在LIN数据总线系统的LIN控制单元与CAN总线之间起翻译作用。
[单项选择]If liquid refrigerant accidentally comes in contact with the eyes, （） immediately.
A. rub the eyes
B. irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. obtain medical help
[单项选择]Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A. 97 times greater
B. 94 times greater
C. 10 times greater
D. 2 times greater
[单项选择]The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called （）.
A. boiling off
B. flash evaporation
C. condensation
D. none of the above
[单项选择]When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.
A. flooding back
B. superheating
C. overflowing
D. recycling
[单项选择]Increasing the number of slack liquid tanks has the effect of raising the（）.
A. uncorrected KG
B. maximum allowed KG
C. virtual height of the center of gravity
D. metacentric height
[单项选择]Reducing the liquid free surfaces in a vessel reduces the（）.
A. roll period
B. metacentric height
C. waterplane area
D. vessel's draft
[单项选择]Increasing the number of slack liquid tanks has effect of raising the（）.
A. uncorrected KG
B. maximun allowed KG
C. virtual height of the center of gravity
D. metacentric height
[单项选择]If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A. capacity will increase
B. capacity will decrease
C. suction pressure will increase
D. suction pressure will decrease
[单项选择]The valve best suited for throttling gas or liquid flow in a pipeline is the（）.
A. gate valve
B. globe valve
C. check valve
D. plug cock
[单项选择]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 charged
B. there is air leaking in from the condenser
C. ice crystals are forming in the refrigerant
D. the system contains less than a full charge of refrigerant
[单项选择]If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
A. too much refrigerant in the system
B. oil entrained in the refrigerant
C. less than a full charge of refrigerant in the system
D. ice crystals forming in the refrigerant
[单项选择]The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.
A. boiling point
B. flash point
C. viscosity point
D. toxic point
[单项选择]A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.
A. high pressure liquid line
B. low pressure liquid line
C. high pressure vapor line
D. low pressure vapor line
[单项选择]The tendency of a flammable liquid to vaporize is indicated by its （）.
A. ignition temperature
B. flash point
C. flammable range
D. convection index
