更多"The evaporating pressure in R22 vap"的相关试题:
[单项选择]When a diesel engine compression pressure is checked, the indicator is connected to the （）
A. cylinder exhaust ports
B. injection line
C. cylinder indicator cock
D. banjo oiler line
[单项选择]When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）
A. Advanced ignition
B. Clogged air intake
C. Leaky exhaust valve
D. High exhaust pressure
[单项选择]Low cylinder compression pressure and a high exhaust temperature may indicate （）
A. early fuel injection timing
B. leaking valves
C. a continuously open scavenge air port
D. low cooling water temperature
[单项选择]A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A. a leaking fuel injector nozzle
B. a clogged air filter
C. excessively early fuel injection
D. malfunctioning valves
[单项选择]A drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A. a leaking fuel injection nozzle
B. a clogged air filter
C. early fuel injection
D. burned valves
[单项选择]Low compression pressure in a diesel engine may be the result of （）
A. insufficient fuel supply due to fuel pump valves sticking or leaking
B. excessive mechanical clearance between the piston crown and cylinder head
C. excessively worn fuel pump plunger
D. excessive exhaust back pressure
[单项选择]Low compression pressure in a diesel engine is caused by（）
A. low water in the expansion tank
B. improperly seated valves
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]Low compression pressure in a diesel engine can be caused by（）
A. improperly seating intake valves
B. leaking cylinder liner seal rings
C. late fuel injection timing
D. carbon deposits on the piston
[单项选择]The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
A. soluble state
B. solid state
C. liquefied state
D. inert state
[单项选择]In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.
A. evaporator
B. compressor
C. condenser
D. none of the above
[单项选择]Reid vapor pressure is（）.
A. exerted by liquid cargo on the sides of a tank
B. exerted by liquid cargo on a cargo hose body
C. the lowest temperature and pressure that will cause a flammable liquid to give off vapors
D. a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
[单项选择]The vapor pressure of a substance（）.
A. decreases as temperature increases
B. increases with the temperature
C. is not affected by temperature
D. may increase or decrease as the temperature rises
[单项选择]Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means （）.
A. a liquid
B. a pressure
C. a temperature
D. none of the above
[多项选择]可使用R12也可以使用R22的氟压缩机，内充R12时，与R22相比，运行参数的变化是（）。
A. 蒸法压力低
B. 冷凝压力高
C. 产冷量下降
D. 冷却水进出温差大
E. 产冷量上升
[简答题]可使用R12也可使用R22的氟压缩机，内充R12时，其运行参数有何变化？（与充R22时相比）
[简答题]目前空调采用的R22是氟立昂中对臭氧层破坏最小的一种，请问R22到哪年将被全面取缔？
[简答题]活塞式冷水机组在高压侧充注R22液体时，系统内的压力升高，R22液体充不进系统，而且预设的钢瓶重量还未达到，应如何处理？处理时应注意哪些事项？
[判断题]在R12、R22、R502等氟里昂制冷系统中，一般要采用回热循环。
[判断题]R12属于CFC类物质，R22属于HCFC类物质，R134a属于HFC类物质。
