更多"Gasoline vapor tends to collect（）."的相关试题:
[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]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 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]Which statement is TRUE concerning gasoline vapors on board a vessel（）.
A. They are heavier than air and will settle in the lowest part of the vessel
B. They are lighter than air and will settle in the highest part of the vessel
C. They should be vented into the engine to improve combustion
D. They should be vented into the wheelhouse
[单项选择]Gasoline fumes tend to（）.
A. settle near the bottom of the bilge
B. settle near the top of the bilge
C. settle evenly throughout all levels of the bilge by mixing with air
D. disperse to atmosphere
[单项选择]An engine compartment gasoline fire requires which type of extinguisher?（）
A. Carbon dioxide
B. Dry chemical
C. Foam
D. All of the above
[单项选择]Diesel engines are considered safer than gasoline engines because（）.
A. they are more heavily built
B. the fuel used is less volatile
C. they can be easily reversed
D. they operate at a lower speed
[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 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]Gasoline tanks should be filled（）.
A. to the top to expel all vapors from the tanks
B. to the top so the operator is certain how much fuel he has aboard
C. with only sufficient fuel for the planned trip so excess gasoline is not carried
D. to near the top with some space allowed for gasoline expansion
[单项选择]Upon completion of fueling a gasoline driven vessel it is necessary to（）.
A. keep ports，doors，windows，and hatches closed
B. start engines immediately
C. ventilate before starting engine
D. None of the above
