A fuel-air mixture below the lower explosive limit is too ______．A.Rich to burnB.Lean to burnC.Cool to burnD.Dense to burn
A fuel-air mixture below the lower explosive limit is too ______．
A.Rich to burn
B.Lean to burn
C.Cool to burn
D.Dense to burn
相关考题：
The price of our new products is 8%()than()of similar products of Japanese origin. A、lower⋯thatB、below⋯thoseC、under⋯thatD、lower⋯those
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 pointB.fire pointC.upper explosive limitD.lower explosive hmlt
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?A.The mixture is too lean to burnB.The mixture is too rich to burnC.The vapor is about to explodeD.Conditions are perfect for combustion
The flash point of a petroleum product is an indication of its ______.A.viscosityB.pour pointC.volatilityD.lower explosive limit
An inert gas system on a tanker should be used to ______.A.prevent the generation of flammable or combustible gas in tanksB.blow out cargo lines to prevent the build up of gas concentrationsC.dilute tank atmospheres to keep gas concentrations below the lower explosive limitD.prevent fires in the pumproom by continually displacing flammable vapors
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
If a cargo of kerosene were considered too lean to explode，then it must be ______．A.Above the explosive rangeB.Within the explosive rangeC.Below the explosive rangeD.None of the above
The minimum temperature required to ignite gas or vapor without a spark or flame being present is called ______．A.Flash pointB.Fire pointC.Autoignition temperatureD.Lower explosive limit
Combustible gas indicators measure the presence of combustible gas as a percentage of the____.A.flash pointB.upper explosive limitC.lower explosive limitD.fire point
主甲板以下是二层甲板。（）A、The deck below the lower deck is known as ‘tween deck.B、The deck below the main deck is known as ‘tween deck.C、The deck above the main deck is known as ‘tween deck.D、The deck below the lower deck is known as main deck.
单选题A combustible gas indicator meter is calibrated to read the percentage of（）.Avapor to oxygenBthe flammable limit concentrationCthe autoignition concentrationDthe lower explosive limit concentretion
单选题A fuel-air mixture below the lower explosive limit is too（）.Arich to burnBlean to burnCcool to burnDdense to burn
单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）ADe-energizes the charged mist effectBMaintains a positive pressure on the vent header to cool the flammable vaporsCInert gas filters out the flammable vapors from the cargo tank spacesDInert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
单选题The atmosphere in a tank is too lean if it is（）.Aincapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)Bcapable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)Ccapable of supporting a fire once startedDnot safe for ballasting
单选题Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）AThe mixture is too lean to burnBThe mixture is too rich to burnCThe vapor is about to explodeDConditions are perfect for combustion
单选题If a cargo of kerosene were considered too lean to explode, then it must be（）.Aabove the explosive rangeBwithin the explosive rangeCbelow the explosive rangeDNone of the above
单选题Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.Aflashing pointBcombustion pointCauto-ignition pointDlower explosive limit
单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.Acompression pressures are below normalBlube oil is diluted with fuel oilCcranking speed is too lowDexhaust system is partially restricted
单选题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 （）Aflash pointBfire pointCupper explosive limitDlower explosive limit
单选题The flash point of a petroleum product is an indication of its（）AviscosityBpour pointCvolatilityDlower explosive limit
单选题If the diesel fuel vapors present are within the flammable range （）.Athe vapor air mixture is too rich to burnBan explosion may occur if a source of ignition is presentCthe vapor air mixture is too lean to bum the upper explosiveDlimit has been exceeded
单选题When flammable liquids are handled in a compartment on a vessel，the ventilation for that area should be（）.Aoperated continuously while vapors may be presentBoperated intermittently to remove vaporsCavailable on standby for immediate useDshut down if an explosive mixture is present
单选题The explosive range of a mixture of flammable vapors is specified as a percentage of （）.Aflammable vapor by volume in airBoxygen present to support combustionCthe temperature of the flash pointDthe lower limit of explosibility of the mixture
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent the build up of gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors
单选题An inert gas system on a tanker should be used to（）.Aprevent the generation of flammable or combustible gas in tanksBblow out cargo lines to prevent gas concentrationsCdilute tank atmospheres to keep gas concentrations below the lower explosive limitDprevent fires in the pumproom by continually displacing flammable vapors
单选题The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.Aauto-ignition pointBflash pointClower explosive limit (LEL)Dthreshold limit value (TLV)
单选题主甲板以下是二层甲板。（）AThe deck below the lower deck is known as ‘tween deck.BThe deck below the main deck is known as ‘tween deck.CThe deck above the main deck is known as ‘tween deck.DThe deck below the lower deck is known as main deck.