Top Dead Center之中文名称为下死点.
Top Dead Center之中文名称为下死点.
相关考题：
If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A.backfire through the air intakesB.develop less power under loadC.have high firing pressuresD.lift its cylinder relief valves
Molded depth is measured from the ______.A.inside of the shellB.outside of the shellC.top of the center vertical keelD.top of the garboard stake
我们想要将表格中的文字放在靠上居中的位置，应该怎么办？（）A、align="middle" align="top"B、align="center" align="top"C、valign="middle" align="top"D、valign="top" align="center"
Which of the following provides the BEST security and accountability for a Data Center?（）A、Entry loggingB、Combination locksC、Card keysD、Dead bolts
单选题A connecting rod in a four-stroke/cycle diesel engine is subject to（）Atension load twice each crankshaft revolutionBcompression load during power and compression strokesCinertia load once every four crankshaft revolutionsDbending loads at bottom and top dead center
单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）Aincrease engine powerBincrease engine loadCdecrease engine powerDimprove fuel economy
单选题A piston is said to be at top dead center when it is （）Aopening the exhaust portsBplaced on top of the engine along its centerlineCfarthest from the cylinder headDnearest to the cylinder head
单选题An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）Aadvance as the load increasesBretard as the load increaseCremain unchanged regardlessDalways occur at top dead center
单选题The abbreviation BDC means （）.ABoston Diesel CompanyBbase circle diameterCswitch board caseDbottom dead center
单选题A piston is at bottom dead center when it is（）Aopening the exhaust portsBclosing the fuel portsCfarthest from the cylinder headDnearest to the cylinder head
单选题If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）Abackfire through the air intakesBdevelop less power under loadChave high firing pressuresDlift its cylinder relief valves
单选题The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）Aexpansion of the combustion gasesBexhaust and intake valves just closingCmaximum compression is just being attainedDfuel injection occurring at that point and combustion begins
单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.Aaccelerates；deceleratesBaccelerates；acceleratesCdecelerates；deceleratesDdecelerates；accelerates
单选题A diesel engine will lose power if fuel injection occurs too early because the （）Afuel will not be properly atomized in the cylinderBignition will be delayed due to low ignition temperatureCmaximum fuel expansion will occur on the compression strokeDfuel will ignite before top dead center
单选题In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.Aproduce a scavenging effect in the combustion spaceBequalize cylinder and exhaust manifold pressuresCalleviate the difference in valve size between the intake and exhaustDflush out condensate that collects after each compression stroke