A、effective cylinder scavenging and cooling
B、constant pressure from the turbochargers
C、cooler operation of the exhaust system
D、effective constant pressure for turbocharger operation
更多“During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）”相关的问题
A、the inlet valve is open B、the exhaust valve is open C、both valves are closed D、both valves are open
A、ensure penetration and distribution of the fuel in the combustion chamber B、ensure the needle valve is flushed clean during each injection C、prevent combustion gas blowback into the open needle valve D、prevent reflected pressure waves when the needle valve closes
A、the beveled edges of the intake valves provide for serf-centering during seating B、intake valves utilize stellite-coated valve seat inserts which reduce wear C、the volume of air passing through intake valves is less than the volume of air passing through exhaust valves D、intake valves are less affected to the corrosive action of exhaust gases
A、increase back pressure during the exhaust process B、facilitate periodic replacement of the valves C、reduce the pumping loss associated with scavenging D、reduce tension on valve springs
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
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
A、clean the flame scanner photocell window B、Inspect and clean all solenoid valves C、lift the safety valves by hand D、Inspect for oil or water leaks
A、removing all but the frictional load during starting B、relieving intercoolers of high temperature buildups C、providing high starting torque in the drive motor D、seating valve plates during compressor shutdown
A、Reduce the pumping rate by closing the deck filling valve B、Close all overflow valves C、Place 5 gallon containers under all flange connections in the fuel line D、Reduce the pumping rate and sound tanks frequently as the level rises
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