A、before TDC and close after BDC
B、after TDC and close after BDC
C、before TDC and close before BDC
D、after TDC and close before BDC
更多“In a four-stroke cycle diesel engine the intake valves open （）”相关的问题
A、The direction of pressure on the journal in four-stroke engine is continuously B、positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C、four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D、Low-stroke engines usually consume less lube oil than four-stroke engines
A、most critical in a four-stroke cycle diesel engine B、most critical in a two-stroke/cycle diesel engine C、most critical in a four-stroke/cycle diesel engine if it is turbocharged D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
A、the same indicated horsepower as a four-stroke/cycle engine B、twice the indicated horsepower as a four-stroke/cycle engine C、one half indicated horsepower as a four-stroke/cycle engine D、one power stroke for every two crankshaft revolutions
A、bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed B、bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed C、the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine D、two-stoke/cycle diesel engines require more complicated lubrication piping
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 cylinders
A、In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B、Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C、No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D、The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
A、two strokes of the piston B、four strokes of the piston C、one revolution of the crankshaft D、four revolutions of the crankshaft
A、crankshaft revolution B、mechanical cycle of operation C、period of two combustion cycles D、cycle of two events
A、once every crankshaft revolution B、once every two crankshaft revolutions C、once every piston stroke D、twice every piston stroke
A、(1) only is correct B、(2) only is correct C、both (1) and (2) are correct D、Neither (1) or (2) are correct
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