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
A SECONDARY function of a waste heat boiler is to （）.
A
reduce engine exhaust noise
B
reduce engine back pressure
C
increase engine cycle efficiency
D
increase turbocharger efficiency
参考答案
参考解析
解析：
暂无解析
更多 “单选题A SECONDARY function of a waste heat boiler is to （）.A reduce engine exhaust noiseB reduce engine back pressureC increase engine cycle efficiencyD increase turbocharger efficiency” 相关考题
考题
Theois designed with a primary combustion chamber for burning sludge oil and ／or solid waste, and two secondary combustion chambers for9ases.burning uncombusted exhaust
A.boilerB.separatorC.incineratorD.treatment lological sewage
考题
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.A.gas compositionB.gas temperatureC.pressureD.timing
考题
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
考题
单选题The function of a lubricating oil is （） to lubricate the running surface （） to carry away a great deal of heat.A
not；butB
neither；norC
either；orD
not only；but also
考题
单选题Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）A
To prevent internal damage form local overheatingB
To ensure the fuel nozzles are flushed cleanC
To clear the smoke stackD
To let the waste heat boiler reduce its rate of steam generation
考题
单选题Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）A
Control of evaporationB
A separate means to prevent feed-water contaminationC
Power circulating pumpD
Super-heater
考题
单选题What is NOT a function of the steam drum of a marine water-tube boiler（）.A
Receives saturated steam from the generating tubesB
Serves as a reservoir of boiler feed waterC
Holds internal fittings for separation of moisture from steamD
Collects steam exhausted from the turbines
考题
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.A
bypass exhaust gas at high loads to prevent excessive back pressureB
bypass a portion of the exhaust gas at peak loads for better efficiencyC
recycle exhaust gas to the turbochargerD
minimize moisture condensation in the boiler gas passages at low loads
考题
单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）A
prevent engine back pressure at heavy loadsB
increase total engine efficiency at low loadsC
prevent boiler corrosion at low engine loadsD
improve engine fuel consumption at any load
考题
单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
operating the boiler at less than normal water levelB
installing fins on the firesides of water-tubesC
increasing the amount of excess air to the burnersD
treating the boiler water with chemical oxygen scavengers
考题
单选题Waterside scale in a fire-tube boiler may cause （）.A
increased heat transferB
fireside erosionC
high steam demandD
overheated tubes
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Diesel engine waste heat boiler construction is usually of the fire-tube or（）A
cyclone furnace boiler typeB
dry back boiler typeC
water-tube typeD
critical circulation boiler type
考题
单选题Generating tubes in waste heat boilers are finned to （）.A
reduce gas flow turbulenceB
prevent exhaust gas corrosionC
increase the rate of combustionD
increase the rate of heat transfer
考题
单选题The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.A
gas compositionB
gas temperatureC
pressureD
timing
考题
单选题Exhaust pipes for separate diesel engines can be combined only when （）A
space limitations prevent separately run pipesB
the engines are small auxiliary unitsC
they are arranged to prevent gas backflow to each engineD
a waste heat boiler is installed
考题
单选题Fins are installed on the fireside of water-tubes used in waste boiler to（）A
decrease the velocity of gases flowing past the tubesB
increase the rate of heat transferC
reduce accumulations carbon depositsD
direct the flow of gases
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Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）A
Natural convection onlyB
Forced convection onlyC
Both natural convection and forced convectionD
None
考题
单选题Which of the following equipment can not be used for the waste heat recovery of the M/E to further improve its thermal efficiency?（）A
M/E turbochargerB
exhaust gas boilerC
incineratorD
fresh water generator
考题
单选题The PRIMARY function of a waste heat boiler is to （）.A
reduce engine exhaust noiseB
reduce engine back pressureC
recover heat which otherwise would be lostD
increase turbocharger efficiency
考题
单选题The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.A
crankshaftB
pistonC
connecting rodD
bearing
考题
单选题Excessive alkalinity of the water in an auxiliary boiler can cause （）.A
caustic embrittlement of the boiler metalB
acidic corrosion of the boiler metalC
hard scale deposits on the boiler tubesD
etching of the heat exchange surfaces
考题
单选题What is the main idea of this passage?A
The difference between the primary school and the secondary school.B
The method that pupils get help from the teachers.C
The personal development of the pupils in the secondary school.D
The function of the secondary school.
考题
单选题One of the main purposes of refractories in a boiler furnace is to（）A
help preheat the air for the furnacesB
help preheat the feedwaterC
protect economizer from excessive heatD
prevent excessive furnace heat losses
考题
单选题A waste heat boiler is installed on some diesel propelled vessels to （）.A
provide steam for emergency propulsionB
provide steam for the turbo-generatorC
heat the waste water tanksD
steam for warming engines
热门标签
最新试卷
