單項(xiàng)選擇題

Directional intake ports in diesel engines are used to （）.

A.reduce air charge turbulence
B.induce air swirl
C.deflect hot combustion gas away from the valves
D.oppose the effects of piston induced squish

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單項(xiàng)選擇題

Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.

A.fuel oil vapor at the sludge tank vent
B.unburned fuel vapors in the scavenge air receiver
C.lube oil vapors in the crank case
D.lube oil vapors in the engine room

單項(xiàng)選擇題

Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.

A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons

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