单项选择题

Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

A.an increased flash point
B.higher lube oil pressures
C.an increased viscosity
D.lower lube oil pressures

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单项选择题

When a fuel injection nozzle overheats, which of the problems listed can be expected?（）

A.The fuel metering will vary
B.The fuel will explode
C.The cylinder head will crack
D.The engine will stop

单项选择题

Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）

A.Leaking fuel injectors
B.Lower than normal compression
C.Delayed fuel injection
D.All of the above are correct

单项选择题

When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）

A.Quantity of fuel injected tends to be decreased
B.Quantity of fuel injected will always be increased
C.Start of injection tends to be advanced
D.Duration of injection will always greater