delivering more air into the cylinder than it would normally receive during an ordinary charging process
forcing the products of combustion out of the cylinder with the fresh air charge
collecting the air charge at the cleaner
combustion and expansion of hot gas
第1题：
During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.
A.effective cylinder scavenging and cooling
B.constant pressure from the turbochargers
C.cooler operation of the exhaust system
D.effective constant pressure for turbocharger operation
第2题：
principle
principal
cause
case
第3题：
A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke
A.①
B.②
C.① and ②
D.Neither ① nor ② is correct
第4题：
The chromium will not wear out the piston rings
The chromium strengthens the liners in the way of the scavenging air ports
Chromium eliminates the need for oil scraper rings
Pores in the plating aid in maintaining the lube oil film
第5题：
coolant for the distillate
coolant for the brine cooler
means of heating the feedwater
primary means of producing a vacuum within the distiller
第6题：
If you are unable to stop a diesel engine by any other means，you should ______．
A.Discharge a CO2 extinguisher in the air inlet
B.Pull off the distributor cap
C.Secure the jacket water
D.Secure the starting air supply valve
第7题：
blows out the exhaust gases
supplies oxygen for combustion
cools the valves and cylinder walls
all of the above
第8题：
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?
A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Blocked cooling water passages to the head
D.Excessive scavenging air provided to the engine
第9题：
Leaking seal ring
Insufficient heat transfer from the exhaust valves
Block cooling water passages to the head
Excessive scavenging air provided to the engine
第10题：
(1) only is correct
(2) only is correct
both (1) and (2) are correct
Neither (1) or (2) are correct