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輪機英語船舶動力裝置章節(jié)練習(xí)(2018.02.09)

單項選擇題
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
單項選擇題
A single piece（） fitted with bronze rings guides the piston in the cylinder liner.
A.piston skirt
B.piston crown
C.guide way
D.cross-head
單項選擇題
The quantity of oil injected into the cylinder can be regulated （）.
A.by turning the pump plunger
B.by vary the fuel valve spring force
C.by no means by controlling the governor
D.by enlarging or diminishing the injection hole
單項選擇題
The bed-plate is secured in the longitudinal direction by means of bolts known as （）.
A.end-chock bolts
B.side-chock bolts
C.through bolts
D.tie rods
單項選擇題
Smaller engines can be made more rigid than large ones and may not have （）.
A.through bolts
B.turbo-chargers
C.bed plates
D.columns
單項選擇題
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A.operated manually once an hour
B.operated until the engine has started
C.placed into operation only at maximum load
D.adjustable to meet lubrication requirements
單項選擇題
Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.
A.throw
B.crankshaft
C.crankpin
D.crosshead
單項選擇題
The gudgeon pin is carried in （） in the piston skirt.
A.the bearing
B.the crosshead
C.bosses
D.bridges
單項選擇題
（） may be the first possible cause which makes the engine to lose power or slow down when it is running.
A.Hot bearing
B.Starting valves
C.Unequal distribution of load
D.Excessive crankshaft clearance
單項選擇題
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）(1) MEP is lower and the scavenging air is cooling the exhaust gases(2) valve overlap in a four-stroke
A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.Neither (1) or (2) are correct

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