Scavenging in a turbocharged, four-str

1、Scavenging in a four-stroke/cycle dies

Scavenging in a four-stroke/cycle diesel engine occurs during the （）.Alast part of the exhaust stroke, and the first part of the intake strokeBlast part of the intake stroke onlyCearly part of the injection stroke onlyDearly part of the power stroke

2、The process of scavenging a two-stroke

The process of scavenging a two-stroke/cycle diesel engine serves to（）Aimprove fuel flow volumeBcool the exhaust valvesCreduce the intake air charge densityDincrease the temperature of exhaust gase

3、In which of the scavenging methods lis

In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）AReturn-flowBUniflowCCross-flowDDirect flow

4、Clearance volume scavenging in a turbo

Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pisto

5、The operating speed of a turbocharger

The operating speed of a turbocharger is directly dependent upon（）Aengine speedBengine loadCintake manifold pressureDatmospheric pressure

6、The scavenging air ports are located a

The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.Aso a heightBsuch a heightCso highDsuch high