單項選擇題Care and cleanliness are required when installing diesel fuel filters ().

A.to prevent the fuel system from becoming air-hound
B.to prevent the fuel system becoming clogged with dirty particles
C.both of the above
D.to prevent the lubricating oil from leaking out of the filter element


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1.單項選擇題Bridge gauge can be used to measure () of a diesel engine.

A.diameters of journals
B.deflections of crankwebs
C.diameters of crankpins
D.none of the above

2.單項選擇題Blow-off of the relief valves of the main cylinders during operation indicates ().

A.the cylinder cover is cracked
B.the injector holes is clogged
C.the cams are not properly set
D.fuel pump is leaking

3.單項選擇題Blow-off of the relief valves of the engines cylinders may be caused by ().

A.too low lead
B.water in fuel
C.too tight spring
D.leakage

4.單項選擇題Before starting the turning gear, () should be worked by hand to minimize corrosive action on the liners.

A.the indicators
B.the starting valves
C.the cylinder lubricators
D.the turning gear

5.單項選擇題Before starting the engine the air bottle should be ().

A.pumped up
B.loaded
C.discharged
D.opened