单项选择题
Low cylinder compression pressure and a high exhaust temperature may indicate （）
A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature
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相关考题
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单项选择题
Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）
A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above -
单项选择题
When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A.intake stroke
B.compression stroke
C.power stroke
D.exhaust stroke -
单项选择题
Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）
A.When heated, it will move proportional to the amount the metal has lengthened or expanded
B.The pointer associated with the pyrometer scale can be made to also measure engine RPM
C.It can be utilized in exhaust manifolds and heat exchangers interchangeably
D.It can indicate temperature at a distant point from the source heat
