轮机英语船舶动力装置章节练习(2017.12.09)

单项选择题
The engine is started with （） supplied from air receivers.
A.pressure oil
B.pressure water
C.compressed air
D.cooling water
单项选择题
To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.
A.salinity
B.alkalinity
C.acid
D.sanitary
单项选择题
During repair,lubrication lines and orifices must be （）.
A.taken away
B.engaged
C.connected
D.sealed off
单项选择题
The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.
A.steel guides
B.steel shells
C.steel bearing caps
D.pig iron
单项选择题
Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.
A.above
B.at
C.over
D.within
单项选择题
Cooling enables the engine metals （） their mechanical properties.
A.to retain
B.to remain
C.to maintenance
D.to have
单项选择题
When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.
A.clockwise, due to the bowl rotating clockwise
B.clockwise, due to the bowl rotating counterclockwise
C.counterclockwise, due to the bowl rotating clockwise
D.counterclockwise, due to the bowl rotating counterclockwise
单项选择题
（） of the A-frames there is a strong cast iron frame called the scavenging air box.
A.At the top
B.At the bottom
C.In the top
D.In the bottom
单项选择题
The exhaust gases for a new engine should be （） when the engine operates under full load.
A.smoky
B.a little bit dense
C.visible
D.almost invisible
单项选择题
When centrifuging heavy fuel oil, an important factor to consider is the （）(1) flow rate(2) viscosity of the fuel oil
A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) are correct