A、improve fuel economy
B、increase the air charge velocity
C、reduce the risk of explosion
D、all of the above
更多“The crankcases of many diesel engines are kept under a slight vacuum to （）”相关的问题
A、A.the splashing of lubrication oil by the crankshaft B、B.the dilution of crankcase oil with particles of combustion C、C.broken fuel lines spraying oil on the crankcase D、D.the ignition of unburned fuel and air in the crankcase
A、a shortage of refrigerant in the system B、air in the system C、an accumulation of liquid refrigerant in the crankcase D、a shortage of oil in the crankcase
A、free entry of air to the crankcase B、water entering the crankcase while engine wash-downs are being performed C、excessive oil leakage during periods of increased blow-by D、sub-cooling internal components
A、removes combustible gases in the crankcase B、prevents the formation of combustible gases in the crankcase C、cools lubricating oil D、improves cold weather starting
A、Open the crankcase immediately to check for damage B、Apply fire fighting water through the crankcase breather C、Allow the engine to cool before opening the crankcase D、Assume that there is no damage to the crankshaft
A、supply clean air to the measuring compartment of the units for more accuracy B、generaate the pressure required for the extraction of the oil mist from the C、generate the pressure required for the extraction of the oil mist from the crankcase D、supply clean air to the measuring track of the units for more accuracy
A、scavenging action of the piston B、piston type vacuum pump taking suction off a differential manometer C、gland exhausting manometer D、crankcase exhaust fan
A、The cylinder indicator cocks should be opened B、The sump lube oil scavenge pump should be secured immediately C、The explosion relief valves should be manually opened D、The crankcase should remain unopened until the engine has cooled
A、A.excessive mist density in the crankcases B、B.excessively high crankcase vacuum C、C.excessively high bearing temperature D、D.excessive carbon buildup in the lube oil
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