reduce engine horsepower output
aid in silencing the exhaust noise
increase the mean effective pressure
contribute to effective cylinder scavenging
第1题：
after TDC
before TDC
after BDC
before BDC
第2题：
an increase in the exhaust temperature of the affected cylinder
the turbocharger may surge
the explosion pressure in all cylinders will rise violently
smoke from the turbocharger air inlet filter will be seen
第3题：
Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).
A.reduce engine horsepower output
B.aid in silencing the exhaust noise
C.increase the mean effective pressure
D.contribute to effective cylinder scavenging
第4题：
carbon buildup in the exhaust manifold
overcooling of the exhaust manifold
eroded muffler baffle plates
high injection pressure
第5题：
Constant volume
Constant pressure
Pulse pressure
Radial flow
第6题：
Worn intake valve guides
Pitted pre-combustion chambers
Loose valve tappets
High exhaust back pressure
第7题：
lower than normal cylinder pressure and low exhaust temperature
lower than normal cylinder pressure and high exhaust temperature
higher than normal cylinder pressure and low exhaust temperature
higher than normal cylinder pressure and high exhaust temperature
第8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9题：
prevent engine back pressure at heavy loads
increase total engine efficiency at low loads
prevent boiler corrosion at low engine loads
improve engine fuel consumption at any load
第10题：
changing the direction of exhaust gas flow
increasing the exhaust gas velocity
changing the exhaust gas weight
increasing the exhaust gas static pressure