A.closing later
B.opening sooner
C.staying open for a shorter period of time
D.staying open for a longer period of time
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A.prevents spark generation
B.removes combustible gases
C.determines the level of combustible gases
D.provides inert gas generation in crankcase
A.free entry of air to the crankcase
B.water entering the crankcase while engine wash-downs are being performed
C.excessive oil leakage during periods of increased blow-by
D.sub-cooling internal components
A.open late and close early
B.open late and close late
C.fail to open when the engine is cold
D.fail to open at normal operating temperature
A.camshaft beatings
B.main bearings
C.piston crowns
D.cylinder walls
A.the highest point in the system
B.the lowest point in the system
C.near the floor
D.plate level or near the tank top level
最新試題
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
The minimum speed an engine must attain before ignition can occur depends upon （）.
The highest pressure in a diesel engine cylinder normally occurs （）.
Maximum horsepower of a diesel engine is attained （）.
The ability of the governor to prevent fluctuations in engine speed is termed （）.
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If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.