更多"The latent heat of water vapor in a"的相关试题:
[单项选择]Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.
A. a specific barometric pressure
B. a specific temperature
C. a specific wind speed
D. any time
[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 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 sensible heat of air is dependent upon the （）.
A. dry bulb temperature
B. wet bulb temperature
C. saturation temperature
D. water vapor superheat
[单项选择]The heat used to change a liquid to a vapor is called （）.
A. latent heat of fusion
B. latent heat of vaporization
C. specific heat of vaporization
D. latent heat of the gas
[单项选择]（）reters to be amount of water vapour in the air.
A. Humidity
B. Temperature
C. Precipitation
D. Wind
[单项选择]The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）
A. the burning
B. the fuel
C. the air charge
D. the engine piston
[单项选择]In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A. increasing refrigerant pressure in the coil
B. increasing chilled water flow through the cooler
C. sub-cooling the refrigerant in the condenser
D. superheating the refrigerant in the compressor
[单项选择]Latent heat changes the （） of water.
A. physical state
B. temperature
C. atmospheric pressure
D. sensible pressure
[单项选择]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A. operating the boiler at less than normal water level
B. installing fins on the firesides of water-tubes
C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavengers
[单项选择]Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.
A. not good
B. good
C. better
D. the best
[单项选择]Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.
A. like
B. as
C. of
D. about
[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 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
