轮机英语真题47期,甲类三管轮.docVIP

2009年第1期海船船员适任统考试题 （总第47期） 一、单项选择题 1. The ____engine is used for alternators and some times for main propulsion with a gearbox provide a propeller of between 90 to 120 rpm. four-stroke B. Two-stroke C. Slow speed D.reversible The abbreviation MIP stand for_____. middle indicating pressure B. mean indicated pressure C. Mean indicated pitch D. Middle indicated power The cetane number of a diesel fuel oil indicates its_____. Viscosity B. Acid content C. Heating value D.ignition quality In a two-stroke engine the camshaft rotates at____the engine rotational speed. Half B.twice C. The same speed as D. Four times A diesel engine is similar to a gasoline engine except that the former has no_____. Cross-head B. Cylinder C. Connecting rod D.spark plug It is easier to replace a dry cylinder liner than a wet one because______. Of the thin wall thickness honing makes it easier to maintain the desired oil film C. Water seals are not required D. It fits more loosely due to a decrease in heat transfer through the composite wall A main bearing consists of two shells which are secured by means of studs and _____. Tie rods B. Through bolts C. Lead wires D. Bearing caps However fast or slow the combustion rate, it is still a _____between carbon, hydrogen, sulph and oxygen that releases heat. Physical deformation B. State exchange C. Chemical reaction D. Coalescence During the fuel injection period, fuel pressure must exceed cylinder gas pressure to _____. Ensure penetration and distribution of the fuel in the combustion chamber Ensure the needle valve is flushed clean during each injection Prevent combustion gas blowback into the open needle valve Prevent reflected pressure waves when the needle valve closes In a diesel engine lube oil system, which of the following parts should be lubricated first? Camshaft bearing B. Main bearing C. Piston crowns D. Cylinder walls In a diesel eng