A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）

If the turbocharger of a four-stroke cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）

A.Intake manifold pressure will be high
B.Intake manifold pressure will be unaffected
C.Exhaust temperatures will be high
D.Exhaust temperatures will be low

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The best tool to use for removing the carbon ridge at the top of an enginecylinder, prior to removing the piston, is to use（）

A.an electric grinder
B.a metal scraper
C.a reamer
D.a three-wing hone

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