intake stroke
compression stroke
power stroke
exhaust stroke
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：
tension load twice each crankshaft revolution
compression load during power and compression strokes
inertia load once every four crankshaft revolutions
bending loads at bottom and top dead center
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：
on the power stroke
on the exhaust stroke
at the end of the power stroke
at the start of the intake stroke
第5题：
intake stroke
exhaust stroke
power stroke
compression stroke
第6题：
natural aspiration
masked intake valves
air cells
scavenging air
第7题：
pumping action of the piston
pressure of the fuel charge
vacuum developed in the manifold
pressure of the fresh air charge
第8题：
The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during ______.
A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke
第9题：
During operation at low speed
During operation at rated speed, but low power output
During acceleration
All of the above
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