单选题Four strokes consist of suction, compression, （） and exhaust stroke.AcombustionBcondensationCchargingDevaporation
单选题
Four strokes consist of suction, compression, （） and exhaust stroke.
A
combustion
B
condensation
C
charging
D
evaporation
参考解析
解析：
暂无解析
相关考题：
A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct
单选题（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）AInefficient scavenging；twiceBInefficient scavenging；1~8 timesCFewer strokes in a circle；twiceDFewer strokes in a circle；1~8 times
单选题The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.AsuctionBcompressionCexpansionDexhaust
单选题Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.Aa exhaust valveBa piston skirtCa piston crownDan air suction valve
单选题The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.Athe beginning of the compression strokeBthe beginning of the suction strokeCthe end of the working strokeDthe end of the exhaust stroke
单选题In four strokes engine, the cycle of events is completed in four strokes of （）.Athe cylinderBthe crankshaftCthe pistonDthe cross-head
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）ALow compression pressure and high exhaust temperatureBLow firing pressure and high exhaust temperatureCLow compression pressure and low exhaust temperatureDLow firing pressure and low exhaust temperature
单选题In a four stroke engine, which process lasts the longest period?（）Aexhaust and suction processBsuction and compression processCcombustion and exhaust processDworking and exhaust process
单选题Late fuel oil injection in a diesel engine can result in （）Afuel knockBincreased powerClow compression pressureDhigh exhaust temperature
单选题In a diesel engine, blow-by（）Aincrease exhaust back pressureBcauses excessive crankcase pressureCcan only be detected by a compression checkDdecreases fuel consumption
单选题Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.A(1) and (2)B(1) onlyC(2) onlyD(1),(2) and (3)
单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.Atwo crankshaft revolutions in a two-stroke/cycle engineBtwo power strokes in a two-stroke/cycle engineCone power stroke in a two-stroke/cycle engineDtwo piston strokes in a two-stroke/cycle engine
单选题Pyrometers commonly found on diesel engine exhaust systems, consist of（）Apyrostats and a voltmeterBa gas-filled bellows, a tube and a pressure gaugeCthermocouples and a voltmeterDammeters and thermocouples
单选题Which of the listed set of conditions indicates early fuel injection timing?（）ALoss of engine power and high exhaust temperaturesBHigher than normal firing pressure and low exhaust temperaturesCHigh fuel consumption and high exhaust temperaturesDLower than normal compression pressure and high exhaust temperature
单选题The working cycle of a four-stroke diesel engine consists of four events:（） (1) compression (2) expansion (3) exhaust (4) suctionThe correct sequence isA(4)-(2)-(3)-(1)B(4)-(3)-(1)-(2)C(4)-(3)-(2)-(1)D(4)-(1)-(2)-(3)
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）Ahas little or no internal frictionBhas a lower effective compression ratioCoperates with scavenge air under a positive pressureDoperates without energy absorbing intake and exhaust strokes
单选题（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.AAt the beginning of the compression strokeBAt the beginning of the suction strokeCAt the end of the working strokeDAt the end of the exhaust stroke
单选题The four-stroke cycle is so called because it takes （） to complete the processes needed to convert the energy in the fuel into work.Atwo strokes of the pistonBfour strokes of the pistonCone revolution of the crankshaftDfour revolutions of the crankshaft
单选题It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.Athe suction strokeBthe compression strokeCthe expansion strokeDthe exhaust stroke
单选题When a diesel engine compression pressure is checked, the indicator is connected to the （）Acylinder exhaust portsBinjection lineCcylinder indicator cockDbanjo oiler line
单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）Aa two-stroke engine works without exhaust operationBa two-stroke engine works without compression strokeCa two-stroke engine works without expansion strokeDa two-stroke engine works without suction operation
单选题In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.Aby an fuel valveBthrough an inlet valveCwith an exhaust valveDfrom an outlet valve
单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）AAdvanced ignitionBClogged air intakeCLeaky exhaust valveDHigh exhaust pressure
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
单选题A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.Acrankshaft revolutionBmechanical cycle of operationCperiod of two combustion cyclesDcycle of two events