單項選擇題

The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）

A.the firing pressure in the cylinder
B.a metering helix inside the pump
C.varying the physical length of the plunger stroke
D.varying the clearance between the injector cam and the injector rocker arm

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單項選擇題

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

單項選擇題

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