單項選擇題Which of the following problems may occur when using fuel oil with a high sulphur content?（）

A.Injection lag
B.Lube oil dilution
C.Pre-ignition
D.Corrosion


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1.單項選擇題Burning fuel with a high sulfur content in a diesel engine will （）

A.increase thermal efficiency
B.cause clogging of the fuel system
C.increase the ability of the engine to start in cold weather
D.produce corrosion in the cylinder and exhaust system at low loads

2.單項選擇題Leaking oil seals on a diesel engine turbocharger can cause（）

A.the engine to run after the fuel has been secured
B.the engine to over-speed
C.a fire
D.all of the above

3.單項選擇題If the back clearance of a piston ring is excessive,（）

A.compression pressure in the cylinder will be higher
B.carbon will accumulate behind the ring
C.combustion gases will penetrate beneath the ring land
D.piston side thrust will be increased

5.單項選擇題If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）

A.The cylinder indicator cocks should be opened
B.The sump lube oil scavenge pump should be secured immediately
C.The explosion relief valves should be manually opened
D.The crankcase should remain unopened until the engine has cooled