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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
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更多 “ Reid vapor pressure is ______．A.exerted by liquid cargo on the sides of a tankB.exerted by liquid cargo on a cargo hose bodyC.the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature ” 相关考题
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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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Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolated from sources of vapor ignition by ______．A.CofferdamsB.Gastight bulkheadsC.Passageways or living quartersD.General cargo spaces
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What is a wet cargo ________．A.A liquid cargo carried in the deep tanksB.A canned or bottled liquid such as beerC.A cargo that contains hygroscopic moistureD.A cargo particularly susceptible to damage by moisture
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You are on a tanker designed to carry molten sulfur．Which statement is TRUE ________．A.There must be two portable toxic vapor detectors on boardB.The cargo tank ventilation system must maintain the H2S vapor concentration at 1.85% or more by volumeC.Cargo temperature may be taken by portable thermometersD.The pressure in the heating coils in the tanks must be less than that of the cargo exerted on them
考题
A microbarograph is a precision instrument that provides a ______．A.charted record of atmospheric temperature over timeB.charted record of atmospheric pressure over timeC.graphic record of combustible gases measured in an atmosphereD.graphic record of vapor pressure from a flammable/combustible liquid
考题
A heated bulkhead has the effect on a hygroscopic commodity of ______.A.causing moisture to accumulate against the bulkheadB.lowering the vapor pressure of the commodityC.lowering the dew point of the airD.raising the vapor pressure of the commodity
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液体散货用泵装卸的。（）A、Liquid cargo is loaded and discharged by pumps.B、Liquid cargo is loaded and discharged by tubes.C、Liquid bulk cargo is loaded and discharged by tubes.D、Liquid bulk cargo is loaded and discharged by pumps.
考题
Cargo may be divided into two basic types:（）.A、bulk cargo and container cargoB、bulk cargo and general cargoC、bulk cargo and liquid cargoD、dry cargo and liquid cargo
考题
In（） ships, the cargo space is divided into tanks.A、containerB、dry cargoC、bulkD、liquid cargo
考题
单选题Reid vapor pressure is（）.A
exerted by liquid cargo on the sides of a tankB
exerted by liquid cargo on a cargo hose bodyC
the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD
a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
考题
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
考题
单选题What is the purpose of pressure-vacuum relief valves? （）A
Regulation of discharge pressure from cargo pumpsB
Maintaining constant velocity in cargo linesC
Regulation of suction head on cargo pumpsD
To maintain a tank or void at atmospheric pressure
考题
单选题The designations A，B，C，D and E grades of cargo refer to the（）.A
degrees of quality of petroleum productsB
flash point range and Reid vapor pressure index of petroleum productsC
grades of crude oilD
pour point，color，and viscosity index of petroleum products
考题
单选题Refrigerant enters the condenser as a （）.A
high pressure liquidB
low pressure vaporC
high pressure vaporD
low pressure liquid
考题
单选题Vapor given off by a flammable liquid will burn when ignited provided（）A
the vapor and air mixture is too richB
it is mixed with certain proportions of airC
the vapor is too little compared to the airD
it is of heavy toxicity
考题
单选题A heated bulkhead has the effect on a hygroscopic commodity of（）.A
causing moisture to accumulate against the bulkheadB
lowering the vapor pressure of the commodityC
lowering the dew point of the airD
raising the vapor pressure of the commodity
考题
问答题The difference between a liquid and a gas is obvious (1)____ the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(describe) the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be “dissolved” in a vapor without losing its identity, and another theory held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.The (7)____(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other (8)____, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.
考题
单选题According to regulations，access to a cargo pumproom in a tanker carrying grades C or D liquid cargo shall be（）.A
from areas equipped with power ventilationB
only from enclosed areas free from sources of vapor ignitionC
from the open deckD
from within the vessel
考题
单选题A microbarograph is a precision instrument that provides a（）.A
charted record of atmospheric temperature over timeB
charted record of atmospheric pressure over timeC
graphic record of combustible gases measured in an atmosphereD
graphic record of vapor pressure from a flammable/combustible liquid
考题
单选题Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.A
cofferdamsB
gastight bulkheadsC
passageways or living quartersD
general cargo spaces
考题
单选题Regulations require that access to a cargo pumproom in a tanker carrying grade D liquid cargo，shall be（）.A
away from galleys，living quarters，or navigation spacesB
only from areas equipped with power ventilation systemsC
from the open deckD
isolated from sources of vapor ignition
考题
单选题A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.A
high pressure liquid lineB
low pressure liquid lineC
high pressure vapor lineD
low pressure vapor line
考题
单选题What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）A
RefrigeratorB
RefrigerantC
Cooling mediumD
Brine
考题
单选题Access to a cargo pumproom on a tanker carrying grades A，B，C or D liquid cargoes shall be（）.A
at least 13.1 feet away from the galleys，living quarters or navigation spacesB
from the open deckC
only from areas equipped with power ventilation systemsD
isolated from any part of the vessel which normally contains sources of vapor ignition
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