單項(xiàng)選擇題In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.

A.up；opened
B.down；open
C.up；closed
D.down；closed


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1.單項(xiàng)選擇題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 piston
B.four strokes of the piston
C.one revolution of the crankshaft
D.four revolutions of the crankshaft

2.單項(xiàng)選擇題The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a （）.

A.crosshead
B.crown
C.piston rod
D.connecting rod

3.單項(xiàng)選擇題Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.

A.higher；reduced
B.higher；increased
C.lower；reduced
D.lower；increased

4.單項(xiàng)選擇題（） allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.

A.Diesel engine propulsion
B.Diesel electric propulsion
C.Steam engine propulsion
D.Gas turbine propulsion

5.單項(xiàng)選擇題（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.

A.The medium speed 4-stroke trunk piston engine
B.The low speed 2-stroke crosshead engine
C.The medium speed 2-stroke crosshead engine
D.The low speed 4-stroke trunk piston engine