What is the most probable cause of reduced capacity in a reciprocating air compressor ________．A.Carbon on cylinder headsB.Faulty unloaderC.Leaking air valvesD.Plugged air cooler
What is the most probable cause of reduced capacity in a reciprocating air compressor ________．
A.Carbon on cylinder heads
B.Faulty unloader
C.Leaking air valves
D.Plugged air cooler
相关考题：
Web users are reporting issues downloading various types of media. Which of the following shouldthe administrator do FIRST?() A. Find out what has recently changed on the networkB. Create an action plan and solution identifying potential effects.C. Continue to gather information and see what other problems may exist.D. Determine the most probable cause.
If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.A.misalignment or worn main bearingsB.insufficient cylinder lubricationC.defective or poorly fitted valvesD.All of the above
In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.A.increasing refrigerant pressure in the coilB.increasing chilled water flow through the coolerC.sub-cooling the refrigerant in the condenserD.superheating the refrigerant in the compressor
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.A.refrigerant bubbles in the lube oilB.refrigerant reducing the lube oil viscosityC.oxidation(氧化) of the lube oil from overheatingD.reducing the floc or cloud point of the oil
One of the mirrored disks for the root volume group has failed. Although the logical volumes are mirrored, and the bosboot command was run, the machine will not boot. What is the most probable cause?（）A、Quorum was not turned offB、Paging space was not mirroredC、The dump space was not mirroredD、The surviving disk was too small
The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）A、 Too many nfsd’s runningB、 Client and server with different buffer sizesC、 Bridges， routers or gateways are receiving too many fragmentated packetsD、 Too few nfsd’s running
单选题Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.Ausing a slightly dirty air filterBusing oil having an excessive viscosityCintercooler or after-cooler leaksDcarrying the oil level higher than normal
单选题Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.Athe cooling effect of the condensate reduces the compressors efficiencyBa danger of explosion exists whenever water is present in a compressorCwater causes erratic operation of pneumatic componentsDthe volumetric capacity of the first stage is reduced if water remains
单选题In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）Abroken valve springsBtight drive beltsChigh line voltageDair in the system
单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.Asystem was overcharged with refrigerantBhigh pressure switch was improperly adjustedCexpansion valve strainers were fouledDsuction valves were leaking slightly
填空题What is the probable cause if the fan seems to be running slower than usual?The oven has been put in a ____.
单选题Web users are reporting issues downloading various types of media. Which of the following shouldthe administrator do FIRST?（）AFind out what has recently changed on the networkBCreate an action plan and solution identifying potential effects.CContinue to gather information and see what other problems may exist.DDetermine the most probable cause.
单选题Broken valve strips in an operating low pressure, air compressor will cause （）.Aan immediate crankcase explosionBoil contamination in the compressed airCa decrease in compressor capacityDno immediate loss of the compressed air capacity
单选题If the electric motor driving an air compressor fails to start, the cause may be a （）.Aleaking unloaderBtripped circuit breakerCcontrol line leakDdefective pop valve
单选题Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）AThe density of the air entering the compressorBThe temperature of the air entering the compressorCThe designed rotating speed of the compressorDA leaking head gasket
单选题In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.Aincreasing refrigerant pressure in the coilBincreasing chilled water flow through the coolerCsub-cooling the refrigerant in the condenserDsuperheating the refrigerant in the compressor
单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）AExcessive compression in the cylinderBA broken intake valveCA dirty inlet filter elementDAn improperly adjusted discharge valve
单选题The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）A Too many nfsd’s runningB Client and server with different buffer sizesC Bridges， routers or gateways are receiving too many fragmentated packetsD Too few nfsd’s running
单选题A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.Acompressor is overloadedBmotor is overloadedCfoundation bolts are looseDbelts are too tight
单选题If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.Amisalignment or worn main bearingsBinsufficient cylinder lubricationCdefective or poorly fitted valvesDall of the above
单选题Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.Awax precipitation in the lube oilBcontamination by dust, scale, or moistureCrefrigerant bubbles in the lube oilDrefrigerant reducing the lube oil viscosity
单选题One of the mirrored disks for the root volume group has failed. Although the logical volumes are mirrored, and the bosboot command was run, the machine will not boot. What is the most probable cause?（）AQuorum was not turned offBPaging space was not mirroredCThe dump space was not mirroredDThe surviving disk was too small
单选题Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）Arefrigerant bubbles in the lube oilBrefrigerant reducing the lube oil viscosityCoxidation of the lube oil from overheatingDreducing the floc or cloud point of the oil
单选题Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.Aleaky discharge valves on the LP cylinderBleaky discharge valves on the HP cylinderCinsufficient intercooler coolingDlow ambient air pressure
单选题Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）ACarbon build up in the piston ring beltBFaulty operation of a cylinder un-loaderCCompressor operation in an area of high relative humidityDLifting of intercooler rebel valve
填空题What was the probable cause of the fire?Most likely a burning ____.