单项选择题
In a four-stroke cycle diesel engine the intake valves open （）
A.before TDC and close after BDC
B.after TDC and close after BDC
C.before TDC and close before BDC
D.after TDC and close before BDC
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相关考题
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单项选择题
Diesel engine air start system check valves are opened by （）
A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs -
单项选择题
For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）
A.chemical analysis
B.back pressure readings
C.pyrometer readings
D.infrared analysis -
单项选择题
Low compression pressure in a diesel engine may be the result of （）
A.insufficient fuel supply due to fuel pump valves sticking or leaking
B.excessive mechanical clearance between the piston crown and cylinder head
C.excessively worn fuel pump plunger
D.excessive exhaust back pressure
