Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.

A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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 pisto

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 pisto

A . At zero load the intake manifold pressure is greater than the exhaust manifold pressure B . At full load the intake manifold pressure and exhaust manifold pressure are equal C . At full load the intake manifold pressure is less than the exhaust manifold pressure D . At full load the intake manifold pressure is greater than the exhaust manifold pressure

A . inoperative turbocharger B . inadequate fuel supply C . overload on one cylinder D . unequal load distributio

A . improper venting of the cooling system B . carrying the expansion tank water level too high C . a totally clogged impeller in the cooling water pump D . an incorrectly set cooling system temperature control

A . governor droop B . speeder spring tension C . fuel rack lag D . load on the engine

A . constantly decreasing as engine load increase B . constantly increasing as the amount of supercharging increases C . approximately equal to exhaust manifold pressure at all times D . approximately equal to atmospheric pressure at all time

A . turbocharger stalls B . exhaust pressure increases C . air charge density decreases D . scavenge effect increase

A . reduce load B . check your exhaust C . adjust cooling water temperature D . increase lube oil flow

A . Excessive piston blow-by to the manifold B . Insufficient cooling water flow C . Accumulated water in the air boxes D . Clogged air intake filter

A . Faulty turbocharger turbine diffuser ring B . Faulty turbocharger compressor ring C . Insufficient cooling water flow D . Clogged air intake filter

A . higher torque but lower brake horsepower B . lower torque but higher brake horsepower C . higher torque and lower brake horsepower D . lower torque and higher brake horsepower

A.turbocharger stalls B.exhaust pressure increases C.air charge density decreases D.scavenge effect increases

A.produce a scavenging effect in the combustion space B.equalize cylinder and exhaust manifold pressures C.alleviate the difference in valve size between the intake and exhaust D.flush out condensate that collects after each compression stroke

A.lag behind the increased fuel supplied to the engine B.enter the engine along with the increase in the fuel C.enter the engine before the increased fuel supply D.leave the turbocharger as a negative pulse