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单选题
The weight of liquefied petroleum gas vapors as compared to air is（）.
A
variable
B
the same
C
lighter
D
heavier
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The primary hazard of liquefied petroleum gas and liquefied natural gas is ______．A.PressureB.ToxicityC.TemperatureD.Flammability
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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
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A fire of escaping liquefied flammable gas is best extinguished by ______.A.cooling the gas below the ignition pointB.cutting off the supply of oxygenC.stopping the flow of gasD.interrupting the chain reaction
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A flame screen ______.A.permits the passage of vapor but not of flameB.prevents the passage of flammable vaporC.prevents inert gas from leaving a tankD.permits vapors to exit but not enter a tank
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Which of the following concerning natural gas is NOT true？( ) A.It was not favored in the past.
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C.People are beginning to realize its value.
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Which type of ships as below isn’t subject to Enhanced Survey Program (ESP)?（）A、Non-sea-going shipsB、Liquefied gas carriersC、Bulk carriers, including ore carriersD、Edible oil tankers
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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
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单选题One of the principal dangers inherent in liquefied petroleum gas is（）.A
as it warms up it becomes heavier than airB
the way it reacts with sea waterC
the strong odor it producesD
its low temperature causes frostbite or freezing
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单选题A flame screen（）.A
permits the passage of vapor but not of flameB
prevents the passage of flammable vaporsC
prevents inert gas from leaving a tankD
permits vapors to exit but not enter a tank
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单选题A fire of escaping liquefied flammable gas is best extinguished by（）.A
cooling the gas below the ignition pointB
cutting off the supply of oxygenC
stopping the flow of gasD
interrupting the chain reaction
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单选题Hydrocarbon vapors are usually detected by the use of the （）.A
flame safety lampB
combustible gas indicatorC
gasometerD
oxygen indicator
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单选题The purpose of the deck seal in an inert gas system is to prevent（）.A
flammable vapors from entering machinery spaceB
flue gas escaping to atmosphereC
inert gas escaping to atmosphereD
air entering inert gas system
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单选题The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.A
pressureB
toxicityC
temperatureD
flammability
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单选题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
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单选题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 gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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单选题When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.A
attempt to isolate the fire from the LPGB
cool the bottles or remove them from the fire areaC
see that the valves on all LPG bottles are closedD
place insulating material over the bottles
考题
名词解释题液化天然气liquefied natural gas（LNG）
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