单项选择题
Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）
A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons
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相关考题
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单项选择题
A diesel engine piston crown can crack from （）
A.excessive piston to liner clearance
B.excessive dirt beneath the piston crown that reduces heat transfer
C.faulty nozzle spray
D.all of the above -
单项选择题
Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A.an increased flash point
B.higher lube oil pressures
C.an increased viscosity
D.lower lube oil pressures -
单项选择题
When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
A.The fuel metering will vary
B.The fuel will explode
C.The cylinder head will crack
D.The engine will stop
