單項選擇題A diesel engine piston crown can crack from ()

A.excessive piston to liner clearance
B.excessive dirt beneath the piston crown that reduces heat transfer
C.faulty nozzle spray
D.all of the above


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題A properly honed diesel engine cylinder liner will()

A.prevent piston ring wear
B.shorten the ring break-in period
C.prevent cylinder liner glazing
D.appear slick and glazed