搜题
用户您好， 请在下方输入框内搜索其它题目：
搜题
题目内容 （请给出正确答案）
提问人：网友 发布时间：
【单选题】

The tube in a boiler should be blinded if found （）.

A、scaled

B、informed

C、leaky

D、deformed

查看正确答案
更多“The tube in a boiler should be blinded if found （）.”相关的问题
第1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  

点击查看答案
第2题
[单选题] Which of the following statements concerning fire-tube boilers is correct?（）

A、Combustion gases flow through the tubes  B、Flames impinge on the tubes  C、Combustion occurs in the tubes  D、Water flows through the tubes  

点击查看答案
第3题
[单选题] In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.

A、water-tube  B、fire-tube  C、exhaust gas  D、none of the above  

点击查看答案
第4题
[单选题] Excessive alkalinity of the water in an auxiliary boiler can cause （）.

A、caustic embrittlement of the boiler metal  B、acidic corrosion of the boiler metal  C、hard scale deposits on the boiler tubes  D、etching of the heat exchange surfaces  

点击查看答案
第5题
[单选题] In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

A、water-tube  B、fire-tube  C、exhaust gas  D、None of the above is true  

点击查看答案
第6题
[单选题] Auxiliary boilers can be classified as（）

A、water-tube natural circulation boilers  B、fire-tube boilers  C、water-tube forced circulation boilers  D、all of the above  

点击查看答案
第7题
[] The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

A、A.operating the boiler at less than normal water level  B、B.installing fins on the firesides of water-tubes  C、C.increasing the amount of excess air to the burners  D、D.treating the boiler water with chemical oxygen scavengers  

点击查看答案
第8题
[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  

点击查看答案
第9题
[单选题] Bottom blow valves are installed on auxiliary water-tube boilers to （）

A、remove suspended and precipitated solids from the boiler water  B、completely drain the boiler in an emergency situation  C、prevent hardened scale deposits in the water drum  D、remove floating impurities from the oily water surface  

点击查看答案
第10题
[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  

点击查看答案
账号：
答题记录 我的收藏 我的题库
客服
TOP

请使用微信扫码支付

订单号：
遇到问题请联系在线客服