constantly decreasing as engine load increase
constantly increasing as the amount of supercharging increases
approximately equal to exhaust manifold pressure at all times
approximately equal to atmospheric pressure at all times
第1题：
A safe fuel system must ______.
A.prevent engine overheating
B.have proper air/gasoline fuel mixture ratio
C.be liquid- and vapor-tight
D.supply sufficient air to the intake manifold
第2题：
exhaust gas pressure
exhaust gas temperature
speed
load
第3题：
The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually______.
A.greater than the average exhaust manifold pressure
B.less than the average exhaust manifold pressure
C.greater at the turbine wheel than at the impeller
D.greater at reduced engine speed
第4题：
discharge exhaust gases and smoke
furnish energy to the turbocharger
reduce engine room noise
all of the above
第5题：
power the after-coolers
power the turbocharger
reduce the cylinder scavenge effect
cool the turbocharger
第6题：
increase the density of the intake air
decrease turbocharger power usage
reduce exhaust gas temperature
compensate for turbocharger PRM fluctuations
第7题：
excessively late injection timing for each cylinder
incorrectly adjusted intake valve timing
incorrectly adjusted fuel injector
incorrectly adjusted intake valve clearance
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：
decreasing the amount of valve overlap
preheating the air intake
after-cooling the intake air
preheating light fuel
第10题：
greater than the average exhaust manifold pressure
less than the average exhaust manifold pressure
greater at the turbine wheel than at the impeller
greater at reduced engine speed