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单选题
The flash point of a liquid refers to the temperature （）
A
at which a liquid will give off inflammable vapors
B
at which a liquid will burn steadily
C
at which a liquid will explode
D
that a liquid must reach before it will flow readily
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A petroleum liquid has a flash point of 85°F. This is a grade ______.A.B flammable liquidB.C flammable liquidC.D combustible liquidD.E combustible liquid
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Sweat damage will occur in a cargo hold containing machinery parts when ______.A.the outside air is colder than the cargo．B.the air temperature of the hold is higher than the outside air temperature．C.the dew point of the hold is higher than the temperature of the cargo．D.the dew point of the outside air is lower than the temperature of the cargo
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When referring to dry bulk cargoes，the term "flow state" ______.A.designates the state of a commodity when the ship is heeled past the angle of reposeB.relates to the suitability of loading a cargo by flowing down inclined chutesC.refers to the saturation of a dry bulk product with water to the point where it acts as a liquidD.relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30°
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Sweat damage in a hatch full of canned goods in cartons will occur when the ______．A.Air temperature is higher than the temperature of the cargoB.Air temperature is lower than the temperature of the cargoC.Dew point is higher than the temperature of the cargoD.Dew point is lower than the temperature of the cargo
考题
Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
考题
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（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.A
Setting pointB
Dew pointC
Flash pointD
Lean point
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单选题When considering the lowest fuel system operating temperature, （） are important.A
specific gravity or relative densityB
open flash point and closed flash point valuesC
higher calorific and lower calorific valuesD
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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.
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单选题The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.A
at which/to whichB
from which/at whichC
to which/from whichD
in which/on which
考题
单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberC
vaporize, with the remaining water at the temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
单选题The temperature of the refrigerant in the evaporator coil depends mostly upon the （）.A
refrigerant pressure in the evaporatorB
cooling water temperature to the condenserC
heat load in the refrigerator compartmentD
solenoid valve in the liquid line
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
单选题The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）A
for atomizingB
for centrifugingC
in a storage tankD
in the re-circulating line
考题
单选题The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.A
increase the refrigerating effect, by decreasing the amount of flash gasB
allow the refrigerant to enter the throttling device in a saturated conditionC
increase the refrigerating effect by increasing the amount of flash gasD
minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
考题
单选题Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.A
freezing pointB
floc pointC
condensing temperatureD
compression temperature
考题
单选题A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.A
B flammable liquidB
C flammable liquidC
D combustible liquidD
E combustible liquid
考题
单选题Which of the following statements describes the relationship between flash point and ignition temperature?（）A
Both are higher than normal burning temperaturesB
The flash point is always higherC
The ignition temperature is always higherD
They are not necessarily related
考题
单选题A space should be ventilated when（）.A
The cargo's temperature is colder than the dew point of the air in the spaceB
The cargo's temperature is warmer than the dew point of the air in the spaceC
The dew point of the air in the space is lower than the dew point of the outside airD
All of the above
考题
单选题The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.A
boiling pointB
flash pointC
viscosity pointD
toxic point
考题
单选题A petroleum liquid has a flash point of 85°F. This is a grade （）.A
B flammable liquidB
C flammable liquidC
D combustible liquidD
E combustible liquid
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