海船船员考试

单选题The water level in a steaming auxiliary boiler will always （）A rise when the steam pressure is increasedB remain constant as long as the feed pump operatesC fall when the steam pressure is decreasedD vary as the steam demand changes

题目
单选题
The water level in a steaming auxiliary boiler will always （）
A

rise when the steam pressure is increased

B

remain constant as long as the feed pump operates

C

fall when the steam pressure is decreased

D

vary as the steam demand changes

参考答案和解析
正确答案： D
解析： 暂无解析
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相似问题和答案

第1题：

The water in an auxiliary boiler should be tested for chloride content to determine ( ).

A.total dissolved solids

B.salt contamination

C.water harcness

D.chlorine contamination


正确答案：B
解析：chloride:氯
译文：应对辅助锅炉的炉水进行含氯量化验，以判断其是否被海水污染。

第2题：

The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.

A.precipitate(使沉淀) silica （硅石）from solution

B.reduce corrosion in the heating coil

C.prevent clogging and erosion in the coil

D.maintain zero water hardness


正确答案：B

第3题：

The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .

A.when the boiler has been secured long enough for most solids to settle

B.when the boiler has been cooled to ambient temperature

C.only after raising the water level to within 0.5 inch of the high water cutout only

D.after bypassing the low pressure


正确答案：A

第4题：

单选题
The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A

operating the boiler at less than normal water level

B

installing fins on the firesides of water-tubes

C

increasing the amount of excess air to the burners

D

treating the boiler water with chemical oxygen scavengers


正确答案： B
解析： 暂无解析

第5题：

单选题
The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）
A

in the event of a flame failure

B

in the event of a stack fire

C

when the water level reach the crown sheet

D

when the feed pump discharge pressure drops to a preset minimum


正确答案： D
解析： 暂无解析

第6题：

If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.

A.high steam pressure in the boiler

B.abnormally high feed-water temperature

C.abnormally high boiler water temperature

D.steam demand exceeding feed pump capacity


正确答案：B

第7题：

单选题
The most common cause of scale formation in an auxiliary boiler is （）
A

concentrations of calcium sulfate in the boiler water

B

fuel oil in the feed water

C

improper treatment of the feed water with calcium sulfate

D

excessive feed water alkalinity


正确答案： C
解析： 暂无解析

第8题：

The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler()

A.salinity is abnormally

B.high steam demand is too

C.feed-water flow is low

D.water level is abnormally low


答案：D

第9题：

单选题
The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）
A

will be modulated in proportion

B

will be modulated in proportion and integral

C

will be modulated in proportion and differential

D

will not be modulated at all


正确答案： C
解析： 暂无解析

第10题：

单选题
In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
A

steam stop valve

B

dry pipe

C

feedwater system

D

generating tubes


正确答案： B
解析： 暂无解析

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