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
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
参考答案
参考解析
解析：
暂无解析
更多 “单选题The vapor pressure of a substance（）.A decreases as temperature increasesB increases with the temperatureC is not affected by temperatureD may increase or decrease as the temperature rises” 相关考题
考题
Substance Dependence refers to a maladaptive pattern of substance use leading to clinically significant impairment or distress characterized by things like ()
A、toleranceB、spending lots of time in activities to obtain the substanceC、withdrawD、Taking the substance in larger amount than before
考题
The passage implies that cellulose is a very porous substance because it contains______.A．a substance that creates pressureB．millions of tiny holesC．a substance that dissolves itD．liquid medicine
考题
The expression THE AIR IS SATURATED means ______.A.the relative humidity is 100%B.the vapor pressure is at its minimum for the prevailing temperatureC.precipitation has commencedD.cloud cover is 100%
考题
How does an inert gas system on a tanker function to prevent explosions in cargo tanks?A.De-energizes the "charged mist" effectB.Maintains a positive pressure on the vent header to cool the flammable vaporsC.Inert gas filters out the flammable vapors from the cargo tank spacesD.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
考题
The dew point is reached when the ______.A.temperature of the air equals the temperature of the seawaterB.atmospheric pressure is 14.7 lbs. per square inchC.relative humidity reaches 50%D.air becomes saturated with water vapor
考题
The vapor pressure of a gas is the pressure necessary to keep it in a（n）______．A.Soluble stateB.Solid stateC.Liquefied stateD.Inert state
考题
Reid vapor pressure is ______．A.exerted by liquid cargo on the sides of a tankB.exerted by liquid cargo on a cargo hose bodyC.the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
考题
What best describes for how long a gas-free test is good ________．A.For as long as is indicated on the gas-free certificateB.For the instant that it is madeC.Until valves in line with the tank or compartment are reopenedD.Until changes in temperature or pressure affect the vapor content in the space
考题
You are on a tanker designed to carry molten sulfur．Which statement is TRUE ________．A.There must be two portable toxic vapor detectors on boardB.The cargo tank ventilation system must maintain the H2S vapor concentration at 1.85% or more by volumeC.Cargo temperature may be taken by portable thermometersD.The pressure in the heating coils in the tanks must be less than that of the cargo exerted on them
考题
A microbarograph is a precision instrument that provides a ______．A.charted record of atmospheric temperature over timeB.charted record of atmospheric pressure over timeC.graphic record of combustible gases measured in an atmosphereD.graphic record of vapor pressure from a flammable/combustible liquid
考题
A heated bulkhead has the effect on a hygroscopic commodity of ______.A.causing moisture to accumulate against the bulkheadB.lowering the vapor pressure of the commodityC.lowering the dew point of the airD.raising the vapor pressure of the commodity
考题
单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）A
De-energizes the charged mist effectB
Maintains a positive pressure on the vent header to cool the flammable vaporsC
Inert gas filters out the flammable vapors from the cargo tank spacesD
Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
考题
单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）A
Water is heated into vapor on heating surfacesB
Water is vaporized by pressure differenceC
There are no heating-transfer surfacesD
There are more heating-transfer surfaces
考题
单选题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
evaporatorB
compressorC
condenserD
none of the above
考题
单选题The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.A
soluble stateB
solid stateC
liquefied stateD
inert state
考题
单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）A
lower condensingB
higher coolingC
lower coolingD
higher condensing
考题
单选题Vapor given off by a flammable liquid will burn when ignited provided（）A
the vapor and air mixture is too richB
it is mixed with certain proportions of airC
the vapor is too little compared to the airD
it is of heavy toxicity
考题
单选题A heated bulkhead has the effect on a hygroscopic commodity of（）.A
causing moisture to accumulate against the bulkheadB
lowering the vapor pressure of the commodityC
lowering the dew point of the airD
raising the vapor pressure of the commodity
考题
单选题When the relief valve opens it discharges high pressure refrigerant vapor to the （）.A
liquid strainerB
refrigerant inlet of the condenserC
inlet side of the evaporatorD
suction side of the compressor
考题
单选题The dew point is reached when the（）.A
temperature of the air equals the temperature of the seawaterB
atmospheric pressure is 14.7 lbs. per square inchC
relative humidity reaches 50%D
air becomes saturated with water vapor
考题
单选题A microbarograph is a precision instrument that provides a（）.A
charted record of atmospheric temperature over timeB
charted record of atmospheric pressure over timeC
graphic record of combustible gases measured in an atmosphereD
graphic record of vapor pressure from a flammable/combustible liquid
考题
单选题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 lineB
low pressure liquid lineC
high pressure vapor lineD
low pressure vapor line
考题
单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.A
sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
superheated vapor
考题
单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）A
Gravity siphon effectB
Higher vacuum in the second-stageC
Difference in brine density between first and second stagesD
lower pressure in first-stage
考题
单选题What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）A
RefrigeratorB
RefrigerantC
Cooling mediumD
Brine
考题
单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）A
Ball floatB
ThermostaticC
BimetallicD
Impulse
热门标签
最新试卷
