Intake stroke
Compression stroke
Exhaust stroke
Pumping stroke
第1题:
If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.
A.the crankcase explosion
B.lifting of the cylinder safety valve
C.a scavenge fire
D.opening of the manhole
第2题:
up and draw in a fresh air charge
down to burn off fuel
down to compress the fuel air charge
up and force out the exhaust gases
第3题:
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.
A.The direction of pressure on the journal in four-stroke engine is continuously
B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D.Low-stroke engines usually consume less lube oil than four-stroke engines
第4题:
inwards
outwards
downwards
upwards
第5题:
intake stroke
compression stroke
power stroke
exhaust stroke
第6题:
once every crankshaft revolution
once every two crankshaft revolutions
once every piston stroke
twice every piston stroke
第7题:
coming up from the BDC
coming up from the TDC
coming down from the BDC
coming down from the TDC
第8题:
If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximately
A.the same indicated horsepower as a four-stroke/cycle engine
B.twice the indicated horsepower as a four-stroke/cycle engine
C.one half the indicated horsepower as a four-stroke/cycle engine
D.one power stroke for every two crankshaft revolutions
第9题:
High sulphur content fuel
High lube oil temperatures
High vanadium content fuel
Excessive piston slap
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