单选题Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pistons
单选题
Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A
during the valve overlap period
B
with only the exhaust valve open
C
at a pressure below atmospheric
D
without cooling the cylinders or pistons
参考解析
解析：
暂无解析
相关考题：
在下面的运算符重载函数的原型中，错误的是A．Volume operator－(double,double)；B．double Volume::operator－(double)；C．Volume Volume::operator－(Volume)；D．Volume operator－(Volume,Volume)；
下列运算符重载函数的原型错误的是( )。A．Volume operator-(double，double)；B．double Volume：：operator-(double)；C．Volume Volume：：operator-(Volume)；D．Volume operator-(Volume，Volume)；
During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.A.effective cylinder scavenging and coolingB.constant pressure from the turbochargersC.cooler operation of the exhaust systemD.effective constant pressure for turbocharger operation
Which presents the heirarchical relationship between LVM entities？（） A、Volume Group Physical Volume Logical Volume FilesystemB、Physical Volume Volume Group Logical Volume FilesystemC、Volume Group Physical Volume Filesystem Logical VolumeD、Physical Volume Volume Group Filesystem Logical Volume
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Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.Aa single, long-stroke, slow-speed, turbocharged, two-stroke diesel engineBa single, long-stroke, medium-speed, turbocharged, four-stroke diesel engineCtwo medium-speed, turbocharged, four-stroke diesel enginesDa variable-speed AC generator
单选题Which presents the heirarchical relationship between LVM entities？（）AVolume Group Physical Volume Logical Volume FilesystemBPhysical Volume Volume Group Logical Volume FilesystemCVolume Group Physical Volume Filesystem Logical VolumeDPhysical Volume Volume Group Filesystem Logical Volume
单选题Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）AsuperchargingBscavengingCturbulenceDswept volume charging
单选题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(1) only is correctB(2) only is correctCboth (1) and (2) are correctDNeither (1) or (2) are correct
单选题The size of the exhaust valve opening is （）Amost critical in a four-stroke cycle diesel engineBmost critical in a two-stroke/cycle diesel engineCmost critical in a four-stroke/cycle diesel engine if it is turbochargedDof equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
单选题High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）Ainoperative turbochargerBinadequate fuel supplyCoverload on one cylinderDunequal load distribution
单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）Aimproper venting of the cooling systemBcarrying the expansion tank water level too highCa totally clogged impeller in the cooling water pumpDan incorrectly set cooling system temperature control
单选题During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）Aeffective cylinder scavenging and coolingBconstant pressure from the turbochargersCcooler operation of the exhaust systemDeffective constant pressure for turbocharger operation
单选题Scavenging in a four-stroke/cycle diesel engine occurs during the （）.Alast part of the exhaust stroke, and the first part of the intake strokeBlast part of the intake stroke onlyCearly part of the injection stroke onlyDearly part of the power stroke
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Clearance gauges at bridges indicate （）.Athe height of the tideBdepth of water under the bridgeCcharted vertical clearance at mean low waterDdistance from the water to low steel of the bridge
单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.Areduce engine horsepower outputBaid in silencing the exhaust noiseCincrease the mean effective pressureDcontribute to effective cylinder scavenging
单选题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）AAt zero load the intake manifold pressure is greater than the exhaust manifold pressureBAt full load the intake manifold pressure and exhaust manifold pressure are equalCAt full load the intake manifold pressure is less than the exhaust manifold pressureDAt full load the intake manifold pressure is greater than the exhaust manifold pressure
单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.Acompression ratioBvalve sizeCfuel pressureDcylinder clearance volume
单选题For a diesel engine, when the piston is at the （）, the clearance volume is the largest.ATDCBDTCCBDCDDBC
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.Atemperature of the exhaust gasesBenergy supplied to the turbochargerCair pressure to the intake manifoldDpurge of exhausted gases from the cylinders
单选题Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.Aimproving cylinder scavengingBpreheating the combustion chamberCreducing air charge densityDpreventing valve wear
单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pistons
单选题A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）Areduce loadBcheck your exhaustCadjust cooling water temperatureDincrease lube oil flow
单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA(1) onlyB(2) onlyCboth (1) and (2)Dneither (1) nor (2)
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