轮机英语船舶动力装置章节练习(2018.02.09)

单项选择题
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
单项选择题
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
单项选择题
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
单项选择题
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
单项选择题
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
单项选择题
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
单项选择题
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
单项选择题
The gudgeon pin is carried in （） in the piston skirt.
A.the bearing
B.the crosshead
C.bosses
D.bridges
单项选择题
（） 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
单项选择题
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