單項選擇題In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）

A.injection lag
B.ignition delay
C.compression
D.turbulence lag


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1.單項選擇題Fuel is ignited in a diesel engine cylinder by （）

A.a spark plug
B.injectors
C.the heat of compression
D.increasing jacket water temperatures

2.單項選擇題Vessels having main engines arranged for air starting are to be provided with at least （）

A.one automatic drain serving both containers
B.two air starting containers of approximately equal size
C.one control air container and one starting air container
D.one additional means of starting the main engine

3.單項選擇題Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）

A.prevent heat corrosion to internal components
B.increase fuel delivery rate and economy
C.prevent pre-ignition
D.avoid carbonization of the nozzle tips

4.單項選擇題If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）

A.loss of suction in the circulating pump
B.leak in the primary cooling system
C.broken raw water pump shaft
D.burned or cracked piston in one cylinder

5.單項選擇題To minimize the formation of carbon deposits on fuel injection nozzles, you should （）

A.avoid using liquid-cooled nozzles whenever possible
B.avoid low cooling water temperatures
C.avoid prolonged overloading of the engine
D.make certain the gasket seal between the nozzle and cylinder head is tight