轮机英语船舶动力装置章节练习(2018.01.30)

单项选择题
In a diesel engine, excessive cylinder liner wear will cause （）(1) increased blow-by(2) wear between the piston ring and groove
A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) axe correct
单项选择题
The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.
A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities
单项选择题
In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.
A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl
单项选择题
When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.
A.strength
B.dense
C.percentage
D.velocity
单项选择题
The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.
A.nip
B.nap
C.gap
D.lip
单项选择题
Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.
A.gravity
B.motion
C.ratio
D.density
单项选择题
（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.
A.The fuel oil
B.The lube oil
C.The sea water
D.The fresh water
单项选择题
The crank throws are displaced from （） to obtained the same number of degrees between the different crank throws.
A.one another
B.the other
C.each other
D.each others
单项选择题
（） fuel oils （） lubricating oils require treatment before passing to the engine.
A.Both；and
B.Neither；nor
C.Either；or
D.Both；or
单项选择题
In four strokes engine, the cycle of events is completed in four strokes of （）.
A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head