单项选择题
A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）
A.low TBN value
B.high alkaline reserve
C.low flash point
D.high pour point
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相关考题
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单项选择题
In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）
A.up and draw in a fresh air charge
B.down to burn off fuel
C.down to compress the fuel air charge
D.up and force out the exhaust gases -
单项选择题
A fuel injection valve opening at pressure lower than normal will result in（）.
A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector -
单项选择题
In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
A.Ⅰonly
B.Ⅱonly
C.bothⅠand Ⅱ
D.neitherⅠnor Ⅱ
