camshaft
piston movement
exhaust valves
vertical drive
第1题：
natural aspiration
masked intake valves
air cells
scavenging air
第2题：
before TDC and close after BDC
after TDC and close after BDC
before TDC and close before BDC
after TDC and close before BDC
第3题：
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by
A.natural aspiration
B.masked intake valves
C.air ceils
D.scavenging air
第4题：
insufficient lubrication
improper piston cooling
blow-by
overload operation
第5题：
wide compression rings are used
oil rings are located above the piston
chromium plating is used on all piston rings
oil rings are located near the bottom of the piston skirt
第6题：
exhaust gas pressure
exhaust gas temperature
speed
load
第7题：
Ⅰonly
Ⅱonly
bothⅠand Ⅱ
neitherⅠnor Ⅱ
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：
excessively late injection timing for each cylinder
incorrectly adjusted intake valve timing
incorrectly adjusted fuel injector
incorrectly adjusted intake valve clearance
第10题：
most critical in a four-stroke cycle diesel engine
most critical in a two-stroke/cycle diesel engine
most critical in a four-stroke/cycle diesel engine if it is turbocharged
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine