單項(xiàng)選擇題
A.fine atomization B.high temperature C.good mixing of fuel and air D.all of the above
A.Rapid increase in temperature with constant pressure B.Rapid increase in pressure with constant temperature C.Rapid increase in pressure and temperature D.Rapid increase in volume and decrease in pressure
A.turbocharger stalls B.exhaust pressure increases C.air charge density decreases D.scavenge effect increases
A.facilitate the installation of piston rings B.allow for the expansion of the piston during operation C.prevent crankcase vapors from entering the combustion chamber D.reduce wearing of the upper cylinder liner
A.direct action of cam shaft B.compressed air pressure C.hydraulic “push rods” D.direct action of the main piston moving down
In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove
A.(1) only is correct B.(2) only is correct C.both (1) and (2) are correct D.neither (1) or (2) axe correct
A.area times the stroke B.area times the stroke, times the number of cylinders C.volume times the stroke D.volume times the stroke, times the number of cylinders
A.water-tube supercritical circulation B.water-tube forced circulation C.fire-tube controlled circulation D.fire-tube express circulation
A.regulating the speed of the turbocharger B.rotating the fuel injector pump plunger C.regulating the speed of the fuel oil transfer pump D.changing engine timing
A.clockwise, due to the bowl rotating clockwise B.clockwise, due to the bowl rotating counterclockwise C.counterclockwise, due to the bowl rotating clockwise D.counterclockwise, due to the bowl rotating counterclockwise
A.reciprocating at the piston pin, rotary at the crank pin B.reciprocating at the crank pin, rotary at the piston pin C.straight reciprocation D.straight rotation
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