轮机英语试题十四.doc

试题十四 一、单项选择题： ______ power is the power developed within the cylinder and can be measured by an engine indicator. A. The shaft B. The mechanical C. The electric D. The indicated Which of the listed design features is most common to a two-stroke/cycle low-speed main propulsion diesel engines? A. Crosshead construction. B. Cross-scavenging air flow. C. Trunk type pistons. D. Single reduction gearing. ______ are mounted on and bolted to the bed-plate cross girders. A. The crankshaft B. The crankcase C. The guide-ways D. The frames The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the ______. A. control rack B. delivery valve C. governor speed D. plunger crossbar The primary duty of lube oil is to reduce ______between the working parts of an engine. A. power output B. friction and wear C. indicated pressure D. rated horsepower A lube oil filter can be used to remove most contaminants from lube oil. A contaminant which will remain in the lube oil after filtering is ______. A. abravise B. fuel oil C. sediment D. impurities Head tank should be used to remove ______ from cooling water. A. scale B. sludge C. chemicals D. air The cylinder and piston must be warmed up ______to a temperature of about 140 deg.F in standing by engine. A. repeatedly B. quickly C. gradually D. immediately ______ in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine. A. Because B. Owing to C. For D. No matter A variable pitch propeller is made ______a boss with separate blades mounted into it. A. of B. up of C. from D. out A thrust bearing is used with a propulsion diesel engine to ______. A. control axial movement of the crankshaft B. transmit