海船船员考试

单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）A High oxygen concentrationB Low pHC Proper alkalinityD All of the above

题目
单选题
For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A

High oxygen concentration

B

Low pH

C

Proper alkalinity

D

All of the above

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相似问题和答案

第1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2题：

辅助给水系统/应急给水系统 auxiliary feed water system/emergency feed water system


正确答案: 在蒸汽发生器主给水系统失效时，立即向蒸汽发生器供水的系统。也可作为反应堆启动、停堆时在主给水未投入的情况下向蒸汽发生器供水。

第3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4题：

单选题
In the event of a flame failure in an auxiliary water-tube boiler, you must（）
A

relight the boiler immediately to prevent loss of steam pressure

B

relight the fire off the brickwork as the bricks are cherry red

C

purge the furnace of any combustible gases before attempting to relight the fire

D

speed up the feed pump to prevent dry firing when the burner flame is reestablished


正确答案： C
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：

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 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9题：

单选题
The purpose of the safety relief valves installed on an auxiliary boiler is to （）.
A

relieve excess fuel oil pressure during the “off” fire cycle

B

admit water to the dry pipe

C

throttle the forced draft fan output for proper combustion

D

reduce excess steam pressure in the boiler


正确答案： C
解析： 暂无解析

第10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

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