轮机英语历年真题46期.doc

中华人民共和国海事局 2008第2期海船船员适任统考试题(总第46期) 科目：轮机英语 试卷代号：805 适用对象：无限/近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至88题，每题1分，第89题至96题，每题1.5分。 一．单项选择题 1. In order to control thermal stresses, some type of modern engines use pistons with _______. A. heavy wall and intensive cooling B. heavy wall and no cooling C. thin wall and no cooling D. thin wall and intensive cooling 2. The average pressure exerted on a piston during each power stroke is termed ________. A. indicated horsepower B. mean effective pressure C. exhaust back pressure D. compression pressure 3. The ignition quality of a diesel fuel is indicated by the ________. A. cetane number B. volatility point C. viscosity index D. octane number 4. A piston in a four-stroke/cycle diesel engine makes four strokes during each _________. A. crankshaft revolution B. mechanical cycle of operation C. period of two combustion cycles D. cycle of two events 5. Crankshafts of medium speed engines are _________ from a single piece of steel. A. unusually solid welded B. never be solid forged C. almost invariably solid forged D. almost invariably be welded\ 6. The starting air entering the cylinder begins when the piston _________. A. has nearly come to the TDC B. has just past the TDC C. has nearly come to the BDC D. has just past the BDC 7. A main bearing consists of two shells which are secured by means of studs and _________. A. tie rods B. through bolts C. lead wires D. bearing caps 8. Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of _________. A. less even torque B. higher cylinder head temperature B. fewer power strokes per revolution D. greater weight/size requirements 9. _________ controls the fuel oil temperature in order to provide oil the correct