单选题Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.Aair coolerBeconomizerCinjectorDair blower
单选题
Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A
air cooler
B
economizer
C
injector
D
air blower
参考解析
解析：
暂无解析
相关考题：
From the last paragraph we can learn that __A. some pipes have to be re-arranged in winterB. the system can do more than warming up the buildingC. the exchangers will pick up heat from the street surfaceD. less heat may be collected in winter than in summer
Which of the following statements about the warm-blooded mammals is true according to the text?A. They can change their environments.B. They can adjust body heat to keep their ideal temperature.C. They can make food from chemicals.D. They get most of their heat from the environment.
In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside. A.water-tubeB.fire-tubeC.exhaust gasD.composite
A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine byA.natural aspirationB.masked intake valvesC.air ceilsD.scavenging air
In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite
单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）Anatural aspirationBmasked intake valvesCair cellsDscavenging air
单选题The （） can tell us how much heat we can get from the burning of an oil.AviscosityBflash pointCcetane numberDcalorific value
单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）Areduce heat radiation to the engine roomBaid in preventing turbocharger overheatingCcondense and drain moisture from exhaust gasesDdampen exhaust gas pulsations in the manifold
单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise
单选题The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）Apumping action of the pistonBpressure of the fuel chargeCvacuum developed in the manifoldDpressure of the fresh air charge
单选题Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）ACarbon dioxideBCarbon monoxideCCarbon trioxideDHydrogen sulfide
单选题A fire must be ventilated（）.Awhen using an indirect attack on the fire such as flooding with waterBto prevent the gases of combustion from surrounding the firefightersCto minimize heat buildup in adjacent compartmentsDif compressed gas cylinders are stowed in the compartment on fire
单选题The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）Aincrease exhaust gas velocity through the boilerBreduce accumulations of carbon deposits on the heat transfer surfacesCeliminate exhaust gas pulsations and noiseDincrease the rate of heat transfer to the waterside
单选题Trunk type diesel engine pistons are effectively cooled when heat is（）Aradiated through the engine blockBtransferred to water cooled cylinder wallsCconducted through the piston crownDtransferred to escaping exhaust gases
单选题Combustible material stored in a compartment adjacent to a compartment where there is a fire may be ignitedThis ignition can occur by （）.Aheat convection through the adjacent bulkheadsBcombustion gases carried through the ventilation systemCdirect convection of the heat emitted by the adjacent fireDheat radiated from the dock or bulkhead by the adjacent fire
单选题"Scavenging" on a diesel engine means （）.Ainjecting fuel oil into a cylinderBremoving exhaust gases from the cylinderCforcing air into the cylinders under pressure after the exhaust valve has dosedDa combination of all the above
单选题It is necessary to secure the forced ventilation to a compartment where there is a fire to（）.Aallow the exhaust fans to remove smokeBextinguish the fire by carbon monoxide smotheringCprevent additional oxygen from reaching the fireDprotect fire fighting personnel from smoke
单选题In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.Aan diesel oil heaterBa waste heat boilerCa fresh water generatorDall the above
单选题Fins are installed on the generating tube surfaces in waste heat boilers to （）.Aprevent soot fires in the exhaust systemBprevent exhaust gas erosion of the tubesCincrease the velocity of exhaust gas flowDincrease the rate of heat transfer
单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）Aexhaust manifoldBvalve bridgeCpressure of the fresh air chargeDvalve adjusting gear
单选题Trunk-type diesel engine pistons are most effectively cooled by heat（）Aconducted through the engine blockBconducted to water cooled cylinder wallsCconducted through the piston crownDloss to escaping exhaust gases
单选题Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）AWhen heated, it will move proportional to the amount the metal has lengthened or expandedBThe pointer associated with the pyrometer scale can be made to also measure engine RPMCIt can be utilized in exhaust manifolds and heat exchangers interchangeablyDIt can indicate temperature at a distant point from the source heat
单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）Aimproper fuel rack positingBlengthy exhaust valve durationCextend operation at light loadDexcessively early injection timing
单选题We learn from the passage that ______.Aall living things on the earth depend on the sun for their foodBa forest looks dark in winter because it absorbs solar energyConly 0.023 of the energy from the sun is made use of on the earthDgreenhouse gases allow heat energy to escape from the earth’ s surface
单选题Radiation can spread a fire by （）.Atransmitting the heat of a fire through the ship s metalBburning liquids flowing into another spaceCheated gases flowing through ventilation systemsDthe transfer of heat across an unobstructed space
单选题Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.Aair coolerBeconomizerCinjectorDair blower