海船船员考试

单选题A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A firing for extended periods in the low fire modeB overheating, due to waterside depositsC varying the water level above the crown sheetD carrying excessive alkalinity in the b

题目
单选题
A distorted furnace in a fire-tube auxiliary boiler may be the result of （）
A

firing for extended periods in the low fire mode

B

overheating, due to waterside deposits

C

varying the water level above the crown sheet

D

carrying excessive alkalinity in the boiler water

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.

A.corrosion at low engine loads

B.erosion at high engine loads

C.overload at high engine loads

D.scaling at all exhaust temperatures


正确答案：A

第2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3题：

In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside.

A.water-tube

B.fire-tube

C.exhaust gas

D.composite


答案：B

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 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6题：

A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.

A.excessive purging before lighting off

B.insufficient trail for ignition period

C.a faulty transformer in the ignition circuit

D.insufficient purging before lighting off


正确答案：D

第7题：

单选题
Too much air in the furnace of an oil-fired boiler would be indicated by （）.
A

yellowish flame

B

golden yellow flame

C

white flame

D

brilliant white flame


正确答案： A
解析： 暂无解析

第8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9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10题：

单选题
Waterside scale in a fire-tube boiler may cause （）.
A

increased heat transfer

B

fireside erosion

C

high steam demand

D

overheated tubes


正确答案： A
解析： 暂无解析

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