單項選擇題A faulty injection in one cylinder of an operating diesel engine can be located by （）

A.cutting out individual injectors and noting engine performance
B.checking lube oil temperature
C.checking cam position
D.using a timing light


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題The major cause of fuel pump and injection system problems is （）

A.improper adjustments
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration