單項選擇題Sludge formation in a diesel engine lube oil system is caused by（）

A.carbonization of oils from the combustion chambers
B.emulsions of lube oil and water
C.coagulation of unburned fuel below the piston rings
D.all of the above


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1.單項選擇題A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）

A.low lube oil temperature
B.low starting air temperature
C.air in the fuel injection
D.water in the starting air system

2.單項選擇題Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）

A.To test the starting system
B.To remove air bubbles from the jacket water
C.To ensure that the lube oil system delivers pressure
D.To ensure foreign material (water etc) is not present in the cylinders

3.單項選擇題In a diesel engine, a positive displacement type blower is usually （）

A.gear drive by the engine
B.driven by an exhaust gas turbine
C.driven by a camshaft
D.driven by separate motor

4.單項選擇題If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）

A.fuel line connections to cylinder injection valves
B.gasket surfaces of the fuel oil filters
C.discharge fitting of the fuel injector pumps
D.suction side of the fuel oil tran

5.單項選擇題Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by （）

A.increasing the quantity of starting air
B.increasing the lube oil pressure
C.heating the engine fuel supply
D.heating the engine jacket water