單項(xiàng)選擇題In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an（）

A.opposed-piston engine
B.double-acting engine
C.two-stroke/cycle engine
D.four-stroke/cycle engine


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1.單項(xiàng)選擇題A disadvantage of a two-stroke/cycle diesel engine is（）

A.more power strokes per revolution
B.the use of scavenge air
C.more complicated valve gear
D.higher working temperature of the piston and cylinder

2.單項(xiàng)選擇題Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）

A.less even torque
B.higher cylinder head temperatures
C.fewer power strokes per revolution
D.greater weight/size requirements

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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