轮机英语44805.docVIP

中华人民共和国海事局 2007年第6期海船船员适任证书全国统考试题(总第44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74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 单项选择题 1．The diesel engine is similar to the gasoline engine in that ____. A. both of them are ignited by compressed air B. both of them are the forms of external combustion engines C. both of them have spark plugs D. the power is developed by the piston in the cylinder 2．The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its____ . A. thermal efficiency B. mechanical efficiency C. brake thermal efficiency D. volumetric efficiency 3．The ignition quality, of diesel fuel oil is indicated by the____. A. specific gravity B cetane number C. viscosity D. calorific value 4．How are the pressure and temperature affected in a diesel engine cylinder during compression? A. Pressure and temperature decrease B. Pressure and temperature increase C. Pressure decreases and temperature increases D. Pressure increases and temperature decreases 5．An aluminum piston has lower inertia and higher coefficient of____ compared to that of cast iron. A. viscosity B. twisting moments C. inertia D. thermal expansion 6．Each cylinder is closed at the top by a____, made of a special heat-resistant steel. A. cylinder liner B. coupling flange C. cylinder cover D. piston crown 7．The amount of fuel delivered by a helical plunger type fuel injection pump is controlled by____. A. rotation of the pump plunger B. rotation of the pump barrel C. varying the pump supply pressure D. varying the pump return pressure 8．In a diesel engine lube oil system, which of the following parts shou