海船船员考试

单选题Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.A 10B 7C 4D 1

题目
单选题
Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.
A

10

B

7

C

4

D

1

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相似问题和答案

第1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2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
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：

Before the seas get rough, it is a good safety practice to ______.

A.secure loose gear

B.move quickly about the ship

C.increase lighting

D.shutdown auxiliary equipment


正确答案：A

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：

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
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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