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

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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

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The major cause of fuel pump and injection system problems is （）

A.improper adjustments
B.contaminated fuel
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单项选择题

A diesel engine should not be operated at low loads for long periods of time because（）

A.heavy carbon deposits will buildup on the valves and in the exhaust
B.fuel dilution is increased at low load
C.exhaust valves may be damaged
D.all of the above