海船船员考试
单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.A two crankshaft revolutions in a two-stroke/cycle engineB two power strokes in a two-stroke/cycle engineC one power stroke in a two-stroke/cycle
题目
two crankshaft revolutions in a two-stroke/cycle engine
two power strokes in a two-stroke/cycle engine
one power stroke in a two-stroke/cycle engine
two piston strokes in a two-stroke/cycle engine
相似问题和答案
第1题：
less even torque
higher cylinder head temperatures
fewer power strokes per revolution
greater weight/size requirements
第2题：
Worn intake valve guides
Pitted pre-combustion chambers
Loose valve tappets
High exhaust back pressure
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：
Diesel engines have more advantages in comparison with gasoline engines
Diesel engines have more advantages in comparison to gasoline engines
Gasoline engines have more advantages in comparison with diesel engines
Gasoline engines have more advantages in comparison to diesel engines
第5题：
sliding the camshaft along its axis
rotating the cam 180
rotating the cam followers 180
moving the idler sprockets in the drive chain
第6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7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8题：
All diesel engines are classified as ______．
A.Four cycle
B.Compression ignition
C.Vacuum ignition
D.External combustion
第9题：
of crosshead type
of trunk piston type
of low speed type
all the above
第10题：
The direction of pressure on the journal in four-stroke engine is continuously
positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
Low-stroke engines usually consume less lube oil than four-stroke engines