单项选择题
A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）
A.carbon
B.vanadium
C.calcium
D.hydrogen
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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（）
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Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）
A.Faulty turbocharger turbine diffuser ring
B.Faulty turbocharger compressor ring
C.Insufficient cooling water flow
D.Clogged air intake filters
