海船船员考试

单选题The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.A acidB alkaliC saltD None of the above

题目
单选题
The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.
A

acid

B

alkali

C

salt

D

None of the above

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相似问题和答案

第1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2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
Black smoke coming from a boiler can be caused by （）.
A

low water level

B

high water level

C

excessively high fuel pressure

D

low oil temperature


正确答案： B
解析： 暂无解析

第5题：

单选题
The pH value of water in a diesel engine closed cooling water system should be maintained between （）.
A

60 to75

B

80 to 95

C

100 to 115

D

120 to 135


正确答案： D
解析： 暂无解析

第6题：

what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .


正确答案：I have ever used the following brand chemicals :unitor , drew and so on . We should keep the boiler water’s ph scale between 10.5 and 11.5 . If the water become of acidity ( ph scale is below 10 ) ,it is may be caused by following reasons : The water has not been given enough blow down ,or has not been filled enough alkalinity chemicals

第7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8题：

The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.

A.lower than

B.higher than

C.below

D.equal to


正确答案：B

第9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10题：

单选题
Which of the following statements concerning the water tube and fire tube boilers is not true?（）
A

natural circulation of the water in the water tube boiler is better than that in the fire tube boiler

B

for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler

C

the water tube boiler will cost shorter time for steam raising

D

the water tube boiler require lower skill in operating and maintaining


正确答案： D
解析： 暂无解析

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