轮机英语试题十六.doc

试题十五 一、单项选择题： A charge of fresh air is drawn into the engine cylinder and then ______by the moving piston ______very high pressure. A. pressed /to B. pressurized /with C. pushed /in D. compressed /to ______is fully floating in both connecting rod small end and the piston skirt. A. The piston rod B. The cross head pin C. The gudgeon pin D. The crank-pin Additives ______protective layers on metal surfaces guarding them against corrosion. A. damage B. form C. dissolve D. contaminate The third engineer took the ______, checked the tank table in the office and recorded all relevant data, as well as calculated the bunkering. A. water level B. sump level C. ballast tank level D. ships trim The main function of the lubrication system is to enable ______of a film of oil between the moving parts. A. the information B. the formation C. the scatter D. the friction The degree to which the viscosity of an oil will change with a change in temperature is indicated by the ______. A. weight designation B. viscosity index C. pour point D. thermal change value Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine ______. A. camshaft bearings B. main bearings C. piston crowns D. cylinder walls Increased air ______will raise scavenge efficiency and allow a greater mass of air to be compressed ; more fuel may now be burned giving an increased power. A. specific volume B. density C. viscosity D. calorific value ______ device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed. A. An automatic B. A transmission C. A self-regulating D. An interlocking ______arrangements have low temperature air and high temperature exhaust gas passing through adjacent ports , causing temperature differential problems for the liner material. A