单项选择题

The cetane number rates fuels for diesel engines according to its （）

A.antiknock characteristics
B.ignition qualities
C.rates of vaporization
D.viscosity

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单项选择题

Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a an（）

A.increase in starting air pressure
B.increase in lube oil viscosity
C.compression expansion device
D.jacket water heater

单项选择题

The burning of fuel oil in a diesel engine having a high sodium content, will cause （）

A.corrosion and grooving of exhaust valves
B.corrosion and gumming of the fuel injection pump
C.salt deposits in the exhaust manifold
D.slag deposits in the fuel injection equipment