名词解释题压力负荷过度（excessive pressure load）
名词解释题
压力负荷过度（excessive pressure load）
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相关考题：
Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?A.A shortage of liquid refrigerant.B.Excessive frost on the evaporator.C.Excessive condenser cooling water.D.Insufficient condenser cooling water flow.
If a diesel engine turned over freely but failed to start, the cause could be ________.A.water in the fuelB.cold lube oilC.excessive starting air pressureD.excessive fuel pressure
If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.A.excessive pump speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment
An increase in the heat load to a refrigeration system will cause ______.A.the suction pressure to decreaseB.the suction temperature to increaseC.increased ice formation on the evaporator coilD.excessive short cycling of the compressor
单选题In （） pump a closed discharge valve will not cause excessive pressure to build up.AgearBvaneCscrewDcentrifugal
单选题A dirty intercooler on an air compressor will cause （）.Adamage to the un-loader operating diaphragmBan increase in current flow to the motorChigh pressure in the receiver and filterDan excessive consumption of crankcase oil
单选题An increase in diesel engine crankcase pressure generally indicates excessive（）Acompression pressureBlube oil header pressureCscavenge air pressureDpiston ring blow-by
单选题To avoid excessive surge pressure when bunkering, you should （）Abunker at a normal rateBcheck for kinks in hoseCclose valves slowlyDshut valves before topping off
单选题Excessive diesel engine back pressure may be an indication of （）Acarbon buildup in the exhaust manifoldBovercooling of the exhaust manifoldCeroded muffler baffle platesDhigh injection pressure
单选题The main purpose of inspection for a running diesel engine is（）Atesting for the mechanical load and the thermal loadBinspecting thermal and mechanical condition of the engineCinspecting each system and exhaust temperatureDtesting for compress pressure and explosion pressure
单选题Which of the following condition is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?（）AIndicated exhaust pressure readings will increaseBPyrometer responses will be retardedCIndicated cylinder temperature readings will increaseDIndicated firing pressure readings will increase
单选题When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）Aair quantity aspiratedBfuel injection pressureCcombustion pressure on the power strokeDcompression on the compression stroke
单选题Which of the following will take place if the clearance of the main bearings are excessive?（）Abearing knocksBdropping of pressure of LOCnoisesDall the above
单选题Which of the following may take place if the clearance of the main bearings are excessive?（）Abearing knocksBdropping of pressure of LOCnoisesDall the above
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve
单选题Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.Aloss of flow in the fuel systemBloss of pressure in the air systemCloss of flow in the lubricating systemDloss of pressure in the lubricating system
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单选题Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）AExhaust energy would draw excess airBThe inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increaseCExhaust gas pumping losses are increased due to turbine windageDExhaust gas back pressure falls slightly due to increased nozzle action
单选题An un-loader is installed on an air compressor to （）.Abypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceBprevent excessive inter-stage pressure buildupCcontrol compressor discharge pressureDremove all but the frictional load during starting
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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A swing check valve is used in a pipeline to （）.Amaintain a preset pressure on the lineBclosely regulate the amount of flowCrelieve excessive pressure on the lineDallow flow in one direction only
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The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.AcontractionBretractionCexpansionDshrinkage