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【单选题】

Bottom blow valves are installed on auxiliary water-tube boilers to （）

A、completely drain the boiler in an emergency

B、prevent sludge from forming in the drum

C、remove floating impurities from the boiler water surface

D、remove settled solids from the water drum

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更多“Bottom blow valves are installed on auxiliary water-tube boilers to （）”相关的问题
第1题
[单选题] The valve that prevents water from backing out of the boiler into the feed line is the（）.

A、bottom-blow valve  B、skin valve  C、feed-check valve  D、feed-stop valve  

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第2题
[] The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping losses The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping losses

A、A.Ⅰ only  B、B.Ⅱ only  C、C.both Ⅰ and Ⅱ  D、D.neither Ⅰ nor Ⅱ  

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第3题
[单选题] The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.

A、main stem stop valve  B、auxiliary steam stop valve  C、feed check or control valve  D、blow down valve  

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第4题
[单选题] A shallow dish positioned at the normal water level is connected to the（）This enables the blowing down or removal of scum and impurities from the water surface.

A、main stern stop valve  B、auxiliary steam stop valve  C、scum valve  D、blow down valve  

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第5题
[单选题] （） will be used to blow away the combustion products from the tube surfaces.

A、The blow down valve  B、The scum valve  C、The air release cock  D、The soot-blower  

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第6题
[单选题] Impurities from the boiler water surface can be removed through the （）.

A、safety valve  B、blow down valve  C、scum valve  D、feed check valve  

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第7题
[单选题] （） will be used to blow away soot and the combustion products from the tube surfaces.

A、The blow down valve  B、The scum valve  C、The air release cock  D、Scot-blower  

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第8题
[] Impurities from the boiler water surface can be removed through the （）.

A、A.safety valve  B、B.blow down valve  C、C.scum valve  D、D.feed check valve  

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第9题
[单选题] The（） is fitted in pair one is the main valve, the other the auxiliary or standby.

A、main stem stop valve  B、auxiliary steam stop valve  C、feed check or control valve  D、blow down valve  

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第10题
[单选题] （） are mounted in pairs to protect the boiler against overpressure.

A、Safety valves  B、Water tubes  C、Steam stop valves  D、Blow down valves  

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