轮机英语【轮机长】题库 单选题 1分 Check valve is not used to control______ . A. direction of oil flow B. back pressure of return oil C. bypass of filter D. high pressure overflow (relief) 点击查看答案 进入题库练习 参考答案: D 参考解析: 单向阀不用于控制高压溢流。 你可能感兴趣的试题 1 单选题 1分 Fireside burning of boiler tubes can be a result of _______. A. slag deposit B. improper atomization C. soot accumulations D. waterside deposits 点击查看答案 2 单选题 1分 Fireside burning of boiler tubes is usually the direct result of _______. A. high furnace temperatures B. gas laning(收缩,原型lane) in tube banks C. oxygen corrosion of metallic surfaces D. overheating due to poor heat transfer 点击查看答案 3 单选题 1分 Waterside scale in a fire-tube boiler may cause______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 点击查看答案 4 单选题 1分 A badly warped boiler water tube can be reworked and bent back into shape by _______. I. heating it with a torch and reforming it with a soft mallet II. Cold pressing it back into shape with a hydraulic jack A. I only B. II only C. Both I and II D. Neither I nor II 点击查看答案 5 单选题 1分 Which of the following problems can occur when an excessive number of water screen tubes are plugged? A. Superheater outlet pressure will rise. B. Superheater outlet temperature will rise. C. Steam pressure leaving the drum will increase D. Steam temperature in the drum will decrease. 点击查看答案