单项选择题

Maintaining the proper fuel oil temperature will result in （）

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by

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单项选择题

Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

A.supercharging
B.scavenging
C.turbulence
D.swept volume charging

单项选择题

Which of the following statements is correct concerning diesel engine cooling water systems?（）

A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
C.At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers
D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

单项选择题

In a full flow type lube oil system, the bypass relief valve will lift due to （）

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil