单项选择题

What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?（）

A.increased carbon buildup
B.burning of intake valves
C.excessive firing pressures
D.increased fuel consumption

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单项选择题

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.

A.improving cylinder scavenging
B.preheating the combustion chamber
C.reducing air charge density
D.preventing valve wear

单项选择题

Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.

A.decreased fuel consumption per brake horsepower
B.more complete cylinder scavenging
C.extended valve life
D.carbon formation on combustion chamber surfaces

单项选择题

A dirty fuel oil filter element can be detected by （）

A.Visual inspection of the element
B.the pressure drop cross the filter
C.high fuel oil tank temperature
D.increase flow rate from the filter