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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 point
B
flash point
C
viscosity point
D
toxic point
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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( ).
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The（auto）ignition temperature is that temperature at which ______．A.No spark or flame is required to ignite gas or vaporB.A fuel begins to give off explosive vaporsC.A fuel if ignited will continue to burnD.A 1% mixture of the fuel with air will explode
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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
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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
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Condenser leakageB
A shortage of liquid refrigerantC
Excessive frost on the evaporatorD
Not enough condenser cooling water
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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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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If the temperature drops low enough, oil will not flow, （） just tell us the temperature.A
Hash pointB
ViscosityC
Pour pointD
Cetane number
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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Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?（）A
Degree of saturationB
Saturation temperatureC
Superheated temperatureD
Degree of superheat
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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 vaporsB
at which a liquid will burn steadilyC
at which a liquid will explodeD
that a liquid must reach before it will flow readily
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单选题In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.A
evaporatorB
compressorC
expansion valveD
condenser
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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 （）A
flash pointB
fire pointC
upper explosive limitD
lower explosive limit
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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
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单选题The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.A
explosive rangeB
flash pointC
ignition temperatureD
combustion temperature
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单选题The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）A
auto-ignition pointB
flash pointC
burning temperatureD
fire point
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
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单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）A
At the designed operating temperature, the liquid refrigerant charge has changed to a vaporB
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
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The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.A
rapidlyB
by gravityC
through a standard orifice at a specified temperatureD
at a rate of 60cc per second
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