网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
参考解析
解析：
暂无解析
更多 “单选题Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.A air coolerB economizerC injectorD air blower” 相关考题
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
考题
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.
考题
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
考题
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
考题
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
考题
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
考题
单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）A
natural aspirationB
masked intake valvesC
air cellsD
scavenging air
考题
单选题The （） can tell us how much heat we can get from the burning of an oil.A
viscosityB
flash pointC
cetane numberD
calorific value
考题
单选题A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）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
考题
单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）A
provide exhaust back pressureB
prevent exhaust smoke emissionsC
power a reciprocating superchargerD
muffle exhaust gas noise
考题
单选题The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）A
pumping action of the pistonB
pressure of the fuel chargeC
vacuum developed in the manifoldD
pressure of the fresh air charge
考题
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?（）A
Carbon dioxideB
Carbon monoxideC
Carbon trioxideD
Hydrogen sulfide
考题
单选题A fire must be ventilated（）.A
when using an indirect attack on the fire such as flooding with waterB
to prevent the gases of combustion from surrounding the firefightersC
to minimize heat buildup in adjacent compartmentsD
if compressed gas cylinders are stowed in the compartment on fire
考题
单选题The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）A
increase exhaust gas velocity through the boilerB
reduce accumulations of carbon deposits on the heat transfer surfacesC
eliminate exhaust gas pulsations and noiseD
increase the rate of heat transfer to the waterside
考题
单选题Trunk type diesel engine pistons are effectively cooled when heat is（）A
radiated through the engine blockB
transferred to water cooled cylinder wallsC
conducted through the piston crownD
transferred to escaping exhaust gases
考题
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 （）.A
heat convection through the adjacent bulkheadsB
combustion gases carried through the ventilation systemC
direct convection of the heat emitted by the adjacent fireD
heat radiated from the dock or bulkhead by the adjacent fire
考题
单选题"Scavenging" on a diesel engine means （）.A
injecting fuel oil into a cylinderB
removing exhaust gases from the cylinderC
forcing air into the cylinders under pressure after the exhaust valve has dosedD
a combination of all the above
考题
单选题It is necessary to secure the forced ventilation to a compartment where there is a fire to（）.A
allow the exhaust fans to remove smokeB
extinguish the fire by carbon monoxide smotheringC
prevent additional oxygen from reaching the fireD
protect fire fighting personnel from smoke
考题
单选题In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.A
an diesel oil heaterB
a waste heat boilerC
a fresh water generatorD
all the above
考题
单选题Fins are installed on the generating tube surfaces in waste heat boilers to （）.A
prevent soot fires in the exhaust systemB
prevent exhaust gas erosion of the tubesC
increase the velocity of exhaust gas flowD
increase the rate of heat transfer
考题
单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）A
exhaust manifoldB
valve bridgeC
pressure of the fresh air chargeD
valve adjusting gear
考题
单选题Trunk-type diesel engine pistons are most effectively cooled by heat（）A
conducted through the engine blockB
conducted to water cooled cylinder wallsC
conducted through the piston crownD
loss to escaping exhaust gases
考题
单选题Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）A
When heated, it will move proportional to the amount the metal has lengthened or expandedB
The pointer associated with the pyrometer scale can be made to also measure engine RPMC
It can be utilized in exhaust manifolds and heat exchangers interchangeablyD
It can indicate temperature at a distant point from the source heat
考题
单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）A
improper fuel rack positingB
lengthy exhaust valve durationC
extend operation at light loadD
excessively early injection timing
考题
单选题We learn from the passage that ______.A
all living things on the earth depend on the sun for their foodB
a forest looks dark in winter because it absorbs solar energyC
only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
考题
单选题Radiation can spread a fire by （）.A
transmitting the heat of a fire through the ship s metalB
burning liquids flowing into another spaceC
heated gases flowing through ventilation systemsD
the transfer of heat across an unobstructed space
考题
单选题Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.A
air coolerB
economizerC
injectorD
air blower
热门标签
最新试卷