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【单项选择题】

The heated feedwater entering any flash chamber of a flash-type evaporator will（）

A、A.vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber

B、B.vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber

C、C.vaporize, with the remaining water at the temperature greater than it entered the flash chamber

D、D.boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber

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更多“The heated feedwater entering any flash chamber of a flash-type evaporator will（）”相关的问题
第1题
[单选题] One of the main purposes of refractories in a boiler furnace is to（）

A、help preheat the air for the furnaces  B、help preheat the feedwater  C、protect economizer from excessive heat  D、prevent excessive furnace heat losses  

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第2题
[单选题] Diesel engine jacket water is used in the distillation process as the （）.

A、coolant for the distillate  B、coolant for the brine cooler  C、means of heating the feedwater  D、primary means of producing a vacuum within the distiller  

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第3题
[单选题] Which of the following statements is correct concerning heat transfer?（）

A、Heat is given off from a high temperature region known as a heat sink  B、Heat transfer rate is affected most by the size of the heat sink involved  C、Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink  D、Heat transfer by radiation will occur only by mass motion of a fluid substance  

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第4题
[单选题] The sum of the sensible heat and the latent heat of any substance is known as （）.

A、total heat  B、residual heat  C、specific heat  D、superheat  

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第5题
[单选题] The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）

A、latent heat of expansion  B、sensible heat of condensation  C、heat of compression  D、all of the above  

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第6题
[单选题] The rate of heat transfer from a hot region to a cold region is affected most by the （）.

A、size of the heat sink  B、temperature difference between the regions  C、size of the heat source  D、total heat of the system  

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第7题
[单选题] The heat gained per pound of refrigerant in the evaporator is known as the（）.

A、latent heat of vaporization  B、sensible heat  C、refrigerating effect  D、specific heat of vaporization  

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第8题
[] Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）

A、A.Increased suction head pressure  B、B.Decreased feedwater temperature  C、C.Pump recirculating line being open too much  D、D.Excessive feedwater temperature  

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第9题
[单选题] The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.

A、remain constant along the tubes length  B、be greatest in a single pass counter flow heat exchanger  C、remain constant throughout the heat exchanger  D、vary from section to section through out the heat exchanger  

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