海船船员考试
单选题The four-stroke cycle is so called because it takes （） to complete the processes needed to convert the energy in the fuel into work.A two strokes of the pistonB four strokes of the pistonC one revolution of the crankshaftD four revolutions of the crank
题目
two strokes of the piston
four strokes of the piston
one revolution of the crankshaft
four revolutions of the crankshaft
相似问题和答案
第1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2题：
less even torque
higher cylinder head temperatures
fewer power strokes per revolution
greater weight/size requirements
第3题：
A、takes to
B、takes away
C、takes down
D、takes in
第4题：
supercharging
scavenging
turbulence
swept volume charging
第5题：
one propulsion
two propulsions
two revolutions
one revolution
第6题：
If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the
A.cylinder compression pressure may not be high enough
B.cylinder compression temperature may be too high
C.fuel oil injection pressure may not be high enough
D.scavenge and purge process is incomplete
第7题：
there are fifteen pounds of CO2 in the container
the container，when full，weighs fifteen pounds
the pressure at the discharge nozzle is l5 psi
the empty container weighs fifteen pounds
第8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9题：
one half crankshaft speed in a two-stroke cycle diesel engine
crankshaft speed in a two-stroke cycle diesel engine
two times crankshaft speed in a two-stroke cycle diesel engine
one-fourth times crankshaft speed in a four-stroke cycle diesel engine
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