單項選擇題A disadvantage of a four-stroke/cycle diesel engine is （）

A.higher working temperature of piston and cylinder
B.the use of scavenge ports
C.fewer power strokes per revolution of the crankshaft
D.part of the fuel is burned as the piston is moving away from top dead center


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1.單項選擇題The cubic inch(or liter) displacement of a cylinder is determined by the diameter of the piston and the （）

A.length of the crankshaft
B.volume of the clearance space
C.weight of piston
D.length of the stroke

2.單項選擇題(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）

A.brake horsepower
B.displacement
C.cylinder volume
D.cylinder clearance

3.單項選擇題Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）

A.TBN of the lubricating oil
B.Temperature of the lube oil
C.Completeness in the mixing of the fuel and air
D.Temperature of the cooling (sea) water

4.單項選擇題When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）

A.starting air pressure
B.scavenge air pressure
C.over-speed trip
D.banjo oiler line

5.單項選擇題When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）

A.starting air pressure
B.scavenge air pressure
C.over-speed trip
D.banjo oiler line