更多"Relative humidity is the percentage"的相关试题:
[单项选择]The temperature at which water vapor in the atmosphere begins to condense is called the ().
A. dew point temperature
B. condensation temperature
C. psychometric temperature
D. absolute humidity temperature
[单项选择]The latent heat of water vapor in air is dependent upon the ()
A. dry bulb temperature
B. wet bulb temperature
C. dew point
D. dry point
[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 evaporating pressure in R22 vapor compression refrigeration plant should be () atmospheric.
A. below
B. above
C. equal to
D. much larger than
[单项选择]Gasoline vapor tends to collect().
A. above the floor plates of the bilges
B. above the carburetor level
C. at the lowest point of the bilge areas
D. at no particular level
[单项选择]Fueling activities()waste liquids and vapor releases to air.
A. commence
B. generate
C. give
D. have
[单项选择]The minimum concentration of a vapor in air which can form an explosive mixture is called the().
A. auto-ignition point
B. flash point
C. lower explosive limit (LEL)
D. threshold limit value (TLV)
[单项选择]The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the().
A. flash point
B. fire point
C. upper explosive limit
D. lower explosive limit
[单项选择]The effect of high vapor superheat in a refrigeration system, is a/an ().
A. increased capacity of the compressor
B. more efficient operation of the thermal expansion valve
C. decreased capacity of the compressor
D. loss of receiver capacity
[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]The humidity of the atmosphere can be determined by the use of the()
A. anemometer
B. potentiometer
C. manometer
D. psychrometer
[单项选择]Before entering a tank, always check the vapor content()a combustible gas indicator.
A. with
B. by
C. of
D. for
[单项选择]Vapor given off by a flammable liquid will burn when ignited provided()
A. the vapor and air mixture is too rich
B. it is mixed with certain proportions of air
C. the vapor is too little compared to the air
D. it is of heavy toxicity
[单项选择]Damage to cargo caused by fumes or vapor from liquids,gases, or solids is known as().
A. contamination
B. oxidation
C. tainting
D. vaporization
[单项选择]Before entering a tank,always check the vapor content()a combustible gas indicator.
A. with
B. by
C. of
D. for
[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
[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