單項選擇題The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）

A.dirt
B.fuel oil
C.governor cooling water
D.fuel oil tars


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2.單項選擇題A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）

A.excessive time required for warming-up
B.excessive freshwater corrosion
C.scale formation on the saltwater side
D.saltwater mixing with the freshwater

3.單項選擇題Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）

A.changes the position of the fuel inlet ports
B.changes the length of the pump stroke
C.varies the quantity of fuel delivered
D.varies the compression of the delivery valve spring

4.單項選擇題During extremely cold weather, while starting an engine, it turns too slowly and fails to startThis problem is most likely the result of （）

A.high fuel oil viscosity
B.low fuel oil temperature
C.high lube oil viscosity
D.energized glow plugs

5.單項選擇題Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）

A.Exhaust temperature
B.Lube oil level
C.Lube oil pressure
D.Water level in the expansion tank