单项选择题

Which of the following should always be checked prior to starting a diesel engine?（）

A.Air filters
B.Fuel oil strainers
C.Crank case oil level
D.Pyrometer readings

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单项选择题

An after-cooler installed between the turbocharger and the cylinder air inlet （）

A.increases the density of the air
B.decrease the density of the air
C.increases the specific heat of the air
D.decreases the specific heat of the exhaust

单项选择题

Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.

A.The direction of pressure on the journal in four-stroke engine is continuously
B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D.Low-stroke engines usually consume less lube oil than four-stroke engines

单项选择题

If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from（）

A.overheated injection pumps
B.water condensed in the cylinders
C.fuel dilution of the lube oil
D.air in the fuel system