单项选择题

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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单项选择题

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

单项选择题

(Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）

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

单项选择题

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