单选题In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.AconstantBpulseChighDnone of the above
单选题
In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.
A
constant
B
pulse
C
high
D
none of the above
参考解析
解析：
暂无解析
相关考题：
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.Pressure-reducing valveB.Unloading valveC.Counterbalance valveD.Pressure-relief valve
When adding oil to a refrigeration system, precautions must be taken to ensure thatA.the compressor suction pressure is not too highB.all air is purged from the pump and charging fittingsC.the high pressure cutout switch is held open to prevent accidental startingD.the condenser is completely shutdown first
Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A.Ignition lag increases.B.Lube oil system pressure increases.C.Brake specific fuel consumption increases.D.Mechanical efficiency increases.
Before performing any maintenance on a hydraulic system storing energy in an accumulator, you shouldA.pressurize the system to test for leaksB.bleed off all pressure within the systemC.operate the machine until it reaches normal temperatureD.disconnect the pump pressure control switch
The refrigeration system low pressure cutout switch is actuated by______.A.an electric system managerB.a sensing bulb at the tail coil of the evaporatorC.pressure changes in the suction lineD.failure of the king solenoid valve
Loran-C uses the multiple pulse system because ______．A.Less signal energy is necessary for receiver operationB.More signal energy is available at the receiverC.It significantly increases the peak powerD.It increases the signal capacity
单选题Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.ArespectableBrespectfulCrespectiveDrespectively
单选题Which of the following hydraulic systems is not one of the three sub-division of the Hydraulic drive system?（）AConstant pressure systemBVariable pressure systemCVariable displacement systemDConstant volume system
单选题One characteristic of a pulse type turbo-charging system is（）Ahigh average exhaust manifoldBgreatly fluctuating inlet manifold pressureCconstant exhaust manifold pressureDmultiple exhaust pipes to the turbocharger
单选题When adding oil to a refrigeration system, precautions must be taken to ensure that （）.Athe compressor suction pressure is not too highBall air is purged from the pump and charging fittingsCthe high pressure cutout switch is held open to prevent accidental startingDthe condenser is completely shutdown first
单选题Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）AConstant volumeBConstant pressureCPulse pressureDRadial flow
单选题Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.Amachine efficiencyBmachinery efficiencyCmechanical efficiencyDmechanics efficiency
单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）Adrain the accumulators and purge with oxygenBbleed off all stored energy from the accumulators completelyCcharge the accumulators to prevent system energy lossDpump the hydraulic fluid into the accumulators to prevent fluid loss
单选题A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.Ahigh pressure liquid lineBlow pressure liquid lineChigh pressure vapor lineDlow pressure vapor line
单选题A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.ApumpBengineCturbineDboiler
单选题Two-stroke engine turbocharging is achieved by two distinct methods, （） termed the constant pressure and the pulse system.ArespectableBrespectfulCrespectiveDrespectively
单选题Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.Aexhaust gas temperature systemBexhaust load systemCconstant or pulse pressure systemDconstant volume system
单选题The purpose of the refrigeration system low pressure cutout switch is to （）Aprotect the compressor from liquid flood backBprotect the compressor from low discharge pressureCstart and stop the compressor upon system demandDstart the compressor after a drop in the evaporator pressure
单选题According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and （）.Athe pulse-phase systemBthe pulse Doppler systemCthe pulse systemDthe pulse interval
单选题A centrifugal pump produces the required pressure energy by means of a rotating （） provided with vanes.ApropellerBimpellerCcircumferenceDscrew
单选题The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.ApersistenceBpulse repetition rateCpulse lengthDresolution
单选题Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.ApulseBexhaustCfluctuatingDhunting
单选题Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）AIgnition lag increasesBLube oil system pressure increasesCBrake specific fuel consumption increasedDMechanical efficiency increaded
单选题Loran-C uses the multiple pulse system because（）.ALess signal energy is necessary for receiver operationBMore signal energy is available at the receiverCIt significantly increases the peak powerDIt increases the signal capacity
单选题Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）AImpellerBElectric motorCVoluteDEye