1.2.2 船舶柴油机的工作原理和基本结构.docVIP

1.2.2 船舶柴油机的工作原理和基本结构 中 华 人 民 共 和 国 海 船 船 员 适 任 考 试 轮机英语自学题库 孔管加热，分配最后排放冷却油到曲轴箱，这个过程被称为震荡冷却。C 4. Successful combustion inside the cylinders of a diesel engine depend upon______. A. fine atomization B. high temperature C. good mixing of fuel and air D. any one of the other alternatives 注 柴油机气缸内完全燃烧取决于良好雾化，高温，以及燃油空气的良好混合。D 5. The function of diesel engine valve springs is to ______. A. hold the valves open B. keep the valves off their seats until the exhaust stroke is completed C. close the valves D. open inlet valves when the air injection cycle begins 注 柴油机阀件弹簧的作用是关闭阀。C 6. Cast iron pistons used in large propulsion diesel engines are constructed with_____. A. no taper B. the skirt being tapered and smaller than the crown C. the skirt being tapered and larger than the crown D. the crown being tapered and smaller than the skirt 注 使用在大型推进装置的铸铁活塞的建造是使用活塞头呈锥面，并且小于活塞裙。D English of marine engineering (Operational Level) 7. In a full floating piston pin, the pin is prevented from sliding against the cylinder walls by _______ A. snap rings B. seal welding C. a press fitting D. a tongue-and-groove 注 在全浮动的活塞销上，扣环可以防止活塞销滑动而碰壁。A 8. The use of push rods is necessary in a diesel engine when______ A. the camshaft located some distance below the rocker arms B. the rocker arms are pivoted near their centers C. two or more valves must be opened and closed at same time D. hydraulic valve lash adjusters are used 注 当凸轮轴位于摇臂之下距离时，推杆的使用是必要的。A 9. In a large slow-speed propulsion diesel engine, the force applied to the crosshead is ______ A. against the crosshead during power stroke and away from the crosshead during the compression stroke B. against the crosshead during the compression stroke and away from the crosshead during the compression stroke C. against the crosshead during the power