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
A dirty intercooler on an air compressor will cause ().
A

damage to the un-loader operating diaphragm

B

an increase in current flow to the motor

C

high pressure in the receiver and filter

D

an excessive consumption of crankcase oil


参考解析

解析: 暂无解析

相关考题:

We can infer from the passage that ______.[A]Hollywood hardly improves southern California's economy[B]the shipping industry there is as dirty as other industries[C]people living near these ports suffer the most[D]the polluted air may cause both asthma and smaller lungs

Air pollutionPeople and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics(统计资料) show that 93 percent of all auto trips are within cities.Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the county.On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes(烟)from iron, steel, chemical, and petrol production add particles(微粒)to the air.The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode(腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.26. The key point of the passage is that().A. the cause of air pollution is peopleB. the causes and the effects of air pollution are both found in citiesC. the effects of air pollution range from headaches to death27. What is the purpose of this passage?A. to persuade people to stop polluting the air().B. to tell the causes of air pollutionC. to tell why cities are bad places to live28. Why is air pollution more grave in the city than in the country?().A. Because there are larger populations in cities.B. Because the air in the city is dirty.C. Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.29. The fumes from coal and oil may cause metal().A. to corrodeB. to twistC. to turn black30. In larger cities, the fumes from coal and oil may contribute to().A. heart diseaseB. loss of clear visionC. lung diseases

what is the use of “unloader “on main air compressor ?

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

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

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Air blowing from the intake air filter of an operating air compressor indicates ().Abroken inlet valvesBbroken discharge valvesCpulsations in the air distribution systemDoverloading of the air distribution system

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The unloading system on an air compressor will ().Aincrease compressor discharge pressure on demandBincrease compressor operating speed as necessaryCallow the motor to turn the compressor opposed only by frictionDreduce the compressor frictional load when starting

单选题()are supplied by main switchboard directly.ASuez Canal searchlight, air compressor and air conditioning compressorBAir compressor, boiler blower and refrigeration plantCBoiler blower, Suez Canal searchlight and refrigeration plantDSuez canal searchlight, air compressor and boiler blower

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 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Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?()AFaulty turbocharger turbine diffuser ringBFaulty turbocharger compressor ringCInsufficient cooling water flowDClogged air intake filters

单选题An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().Aoil foaming in the compressorBhigher than normal suction and discharge pressures with a higher box temperatureChigher than normal discharge pressure with a normal box temperatureDthe compressor to run continuously

单选题The air compressor pumps air to the ().Aexpansion tankBcombustion chamberCair receiverDevaporator

单选题The air compressor pumps air to the ().Aair cylinderBcombustion chamberCsteam drumDexpansion tank

单选题The air compressor pumps air to the().Aengine cylinderBair bottleCevaporatorDcondenser

单选题The air filter is fixed in the () of an air compressor.Ainlet pipeBoutlet pipeCinter coolerDafter cooler

单选题A dirty intercooler on the ship service air compressor will result in ().Adecreased compression ratioBhigher than normal power consumptionCun-loader malfunctionDwater in the lubricating oil

单选题The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be ().AsuperheatedBsuper-cooledCat or below the dew pointDAll of the above

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Air compressor cylinder un-loaders enable the compressor to ().Avary their speed according to temperature and loadBstart and come up to speed before air compression beginsCchange speed according to overload demandsDreduce compressed air charge density

单选题An air compressor can be unloaded at start-up by ().Aholding the discharge valve openBrelieving the intercooler pressure to the atmosphereCusing an enlarged, permanently opened clearance expansion spaceDa pre-charged accumulator

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If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the ().Acontrol air systemBforced draft air systemCsupply air systemDships service air system

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