海船船员考试

单选题The boiler feed water check valves are located on the ()A feed pump suction lineB hot wellC shell of the feed heaterD feed lines to the boiler

题目
单选题
The boiler feed water check valves are located on the ()
A

feed pump suction line

B

hot well

C

shell of the feed heater

D

feed lines to the boiler

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:

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:

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:

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
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

第5题:

单选题
What is NOT a function of the steam drum of a marine water-tube boiler().
A

Receives saturated steam from the generating tubes

B

Serves as a reservoir of boiler feed water

C

Holds internal fittings for separation of moisture from steam

D

Collects steam exhausted from the turbines


正确答案: C
解析: 暂无解析

第6题:

单选题
Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? ()
A

Control of evaporation

B

A separate means to prevent feed-water contamination

C

Power circulating pump

D

Super-heater


正确答案: A
解析: 暂无解析

第7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8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
In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?()
A

The safety valve escape piping should be disconnected from the valve body and a blank inserted

B

The boiler vent valves should be opened

C

All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks

D

All of the above


正确答案: D
解析: 暂无解析

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