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【单项选择题】

A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.

A、A.the system is fully charged

B、B.there is air leaking in from the condenser

C、C.ice crystals are forming in the refrigerant

D、D.the system contains less than a full charge of refrigerant

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更多“A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.”相关的问题

第1题

[单选题] Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

A、filled B、evacuated C、compressed D、charged

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第2题

[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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第3题

[] If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.

A、A.too much refrigerant in the system B、B.oil entrained in the refrigerant C、C.less than a full charge of refrigerant in the system D、D.ice crystals forming in the refrigerant

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第4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、A.high pressure liquid line B、B.low pressure liquid line C、C.high pressure vapor line D、D.low pressure vapor line

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第5题

[单选题] The （） pump discharges a nearly constant amount of liquid regardless of pressure.

A、mixed-flow B、axial-flow C、centrifugal D、displacement

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第6题

[单选题] The （） discharge a nearly constant amount of liquid regardless of pressure.

A、mixed-flow pump B、axial-flow pump C、centrifugal pump D、displacement pump

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第7题

[单选题] Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.

A、positive displacement B、non-positive displacement C、mixed-flow D、axial-flow

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第8题

[单选题] The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.

A、pressure B、velocity C、flow rate D、temperature

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第9题

[单选题] Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）

A、activate the driers B、change color C、secure the compressor D、add a predetermined amount of liquid drier

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