单项选择题Black smoke exhausting from a diesel engine indicates()

A.proper fuel injection
B.water in the fuel
C.incomplete combustion
D.burning of lube oil


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1.单项选择题Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate()

A.an insufficient speed droop setting
B.an overloaded engine
C.clogged drain holes in the oil control rings
D.complete combustion

2.单项选择题A dark exhaust from a running diesel engine can be caused by ()

A.late ignition
B.water in the fuel
C.high compression temperature
D.starting valve stuck open

4.单项选择题Combustion knock will most likely occur as a result of using a fuel with()

A.low ignition quality
B.a high volatility
C.low ignition delay
D.a high cetane number

5.单项选择题High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an()

A.inoperative turbocharger
B.inadequate fuel supply
C.overload on one cylinder
D.unequal load distribution

6.单项选择题One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the ()

A.governor sensitivity
B.exhaust temperature
C.fuel injection pressure
D.speed of the can shaft

7.单项选择题A diesel engine may fail to start due to ()

A.low air charge temperature
B.high cranking speed
C.excessive fuel dilution of lube oil
D.high compression pressure

9.单项选择题A diesel engine fails to start because of water in the fuelIn order to start the engine, you should ()?

A.turn engine with jacking gear
B.drain filters and strainers and bleed off water at each injection pump
C.use ether to start the engine with blow-down valves open
D.blow through the cylinders and fuel lines with a drying agent

10.单项选择题As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?()

A.Compression ratio
B.Fuel/Air ratio
C.Compression pressure
D.Lube oil pressure