单选题The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）ATBOBCEOCCFODMCR
单选题
The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）
A
TBO
B
CEO
C
CFO
D
MCR
参考解析
解析：
暂无解析
相关考题：
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?A.Control the amount of lube oil burned in the combustion chamberB.Transmit heat from the piston to the cylinder linerC.Prevent damage to ring groove inserts by acting as a heat damD.Dissipate combustion chamber gas pressure by channeling it through the ring gap
单选题The lowest ring of a piston is （）.Aa coil springBa sealing ringCan oil distributor ringDmain seal ring
单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）Atop of the ring grooveBback of the ring grooveCbottom of the ring grooveDpiston ring end clearance
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In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）Ais coming upward；cylinder ring beltBis going downward；piston ring beltCis coming upward；piston ring beltDis going downward；cylinder ring belt
单选题A diesel engine piston ring face is in direct contact with the （）.Atop of the ring grooveBcylinder liner oil filmCbottom of the ring grooveDback of the ring groove
单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.sideAⅠonlyBⅡ onlyCboth Ⅰ and ⅡDneither Ⅰ nor Ⅱ
单选题In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and grooveA(1) only is correctB(2) only is correctCboth (1) and (2) are correctDneither (1) or (2) axe correct
单选题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）Ahas a crown-faceBexceeds wear limits through normal wearChas excessive blow-byDis in good condition
单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）AControl the amount of lube oil burned in the combustion chamberBTransmit heat from the piston to the cylinder linerCPrevent damage to ring groove inserts by acting as a heat damDDissipate combustion chamber gas pressure by channeling it through the ring gap
单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）AbackBsideCgapDbottom
单选题The clearance volume for a single stage compressor is defined as the space created between the （）.Atop of the piston and bottom side of head, with the piston at BDCBpiston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCCbottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementDtop of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
单选题In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）AUsed of bimetallic piston ringsBRing gap pre-tensioningCThermal increase in ring-end clearanceDGas pressure acting against the back of the ring
单选题In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.Apiston crownBpiston ring grooveCpiston skirtDpiston ring area
单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）AgapBsideCbackDradial
单选题Persistent knocking in one cylinder of a diesel engine could be caused by（）.Aa low load on that cylinderBsluggish piston ring actionCexcessive piston crown coolingDexcessive clearance of piston pin
单选题For any piston ring to operate smoothly without scuffing ,the ring must be （）.Aof a material harder than the cylinder linerBproperly lubricatedCprevented from compressingDprevented from rotating during engine operation
单选题Which of the following statements concerning cylinder liner wear is true?（）ALiner wear is distributed equally between the upper and lower portions of the cylinderBExcessive liner wear causes wear between piston ring and grooveCExcessive, but uniform liner wear will not cause wear between piston ring and grooveDLiner wear is normally greatest in the middle of the cylinder
单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）Aexcessive ring actionBexcessive ring temperatureCimproper ring rotationDexcessive ring face wear
单选题Top piston rings are plasma coatedIt gives added safety for the of new lines（）Arunning-inBrunning-outCrunning onDrunning down
单选题The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.Aupwards；inwardsBupwards；outwardsCdownwards；inwardsDdownwards；outwards
单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveAⅠonly is correctBⅡ only is correctCboth Ⅰ and Ⅱ are correctDneither Ⅰ or Ⅱ are correct
单选题Ring groove inserts are occasionally used on aluminum alloy piston to（）Areduce the ring groove wear rateBseal against crankcase vaporsClessen the wear on aluminum part of the cylinderDallow for the greater expansion rate of aluminum
单选题Excessive piston ring wear in a diesel engine will cause（）Ahigh lube oil viscosityBincreased lube oil consumptionClow lube oil temperaturesDhigh firing pressures
单选题If the back clearance of a piston ring is excessive,（）Acompression pressure in the cylinder will be higherBcarbon will accumulate behind the ringCcombustion gases will penetrate beneath the ring landDpiston side thrust will be increased
单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）Afaulty combustionBexcessive ring temperatureCover lubricationDall of the above
单选题The piston ring grooves for a standard engine are （）Achromium-plate against wearBanti-corrosion treatedCwhite metal lined against wearDflame hardened against wear