changing the direction of exhaust gas flow
increasing the exhaust gas velocity
changing the exhaust gas weight
increasing the exhaust gas static pressure
第1题：
a leaking seal ring
heat transfer from exhaust valves
restricted cooling passages
overheated intake valves
第2题：
performance
horsepower output
fuel consumption
scavenge effect
第3题：
A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.
A.increasing the linear velocity of the exhaust gases
B.changing directions of exhaust gas flow
C.decreasing the temperature of the exhaust gases
D.accelerating the exhaust gas through a reduced size orifice
第4题：
reducing exhaust gas velocity
increasing the frequency of gas vibration
the use of long head pipes
the use of zinc electrodes
第5题：
over-speeding of the engine
failure of the engine to shut down
no effect of engine mounting bolts
high exhaust temperatures
第6题：
clogged air filter
compression stroke
burned exhaust valves
all of the above
第7题：
passing the exhaust through long head pipes
diffusing exhaust vibrations through activated carbon baffles
increasing the exhaust gas velocity
reducing the exhaust gas velocity
第8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9题：
carbon buildup in the exhaust manifold
overcooling of the exhaust manifold
eroded muffler baffle plates
high injection pressure
第10题：
provide exhaust back pressure
prevent exhaust smoke emissions
power a reciprocating supercharger
muffle exhaust gas noise