單項選擇題Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）

A.Water discharging from the water outlet of the lube oil purifier
B.Fuel oil discharging from the water outlet of the lube oil purifier
C.Lube oil discharging from the water outlet of the lube oil purifier
D.A change in the lube oil viscosity


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1.單項選擇題If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

A.excessively late injection timing for each cylinder
B.incorrectly adjusted intake valve timing
C.incorrectly adjusted fuel injector
D.incorrectly adjusted intake valve clearance

2.單項選擇題Which of the diesel engine cylinder liners listed has internal cooling water passages?（）

A.Internally finned liner
B.Externally finned liner
C.Wet liner
D.Integral water-jacket liner

3.單項選擇題Diesel engine lube oil can become contaminated as a result（）

A.the water produced during combustion
B.the sulfur in the fuel
C.unburned fuel oil
D.all of the above

4.單項選擇題If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）

A.early injection timing
B.worn orifices in the injection nozzles
C.worn or scored cylinder liners
D.using a fuel with too low of a cetane number

5.單項選擇題Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons