单选题Diesel engine waste heat boiler construction is usually of the fire-tube or（）Acyclone furnace boiler typeBdry back boiler typeCwater-tube typeDcritical circulation boiler type
单选题
Diesel engine waste heat boiler construction is usually of the fire-tube or（）
A
cyclone furnace boiler type
B
dry back boiler type
C
water-tube type
D
critical circulation boiler type
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相关考题：
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.A.gas compositionB.gas temperatureC.pressureD.timing
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
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?（）ATo prevent internal damage form local overheatingBTo ensure the fuel nozzles are flushed cleanCTo clear the smoke stackDTo let the waste heat boiler reduce its rate of steam generation
单选题As a heat engine,（） energy is the source of power by which the diesel engine can be operated.AelectricBheatCmechanicalDexhaust
单选题Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）AControl of evaporationBA separate means to prevent feed-water contaminationCPower circulating pumpDSuper-heater
单选题Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.ApossibleBnecessaryCpracticableDimpracticable
单选题Problems with the diesel engine fuel injection pump are usually caused by（）Aimproper adjustmentBcontaminated fuelCkinked fuel linesDexcessive engine vibration
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.Abypass exhaust gas at high loads to prevent excessive back pressureBbypass a portion of the exhaust gas at peak loads for better efficiencyCrecycle exhaust gas to the turbochargerDminimize moisture condensation in the boiler gas passages at low loads
单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）Aprevent engine back pressure at heavy loadsBincrease total engine efficiency at low loadsCprevent boiler corrosion at low engine loadsDimprove engine fuel consumption at any load
单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）ALeaking seal ringBInsufficient heat transfer from the exhaust valvesCBlock cooling water passages to the headDExcessive scavenging air provided to the engine
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单选题In the construction of a diesel engine, what is the purpose of end plates?（）ATo provide accessibility to the cylinder linersBTo add stability to the engine blockCTo add rigidity to the block and a surface for attaching other partsDTo make a surface for the base
单选题The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.Agas compositionBgas temperatureCpressureDtiming
单选题Exhaust pipes for separate diesel engines can be combined only when （）Aspace limitations prevent separately run pipesBthe engines are small auxiliary unitsCthey are arranged to prevent gas backflow to each engineDa waste heat boiler is installed
单选题The is employed to warm up a large diesel engine before its starting（）Ahot airBhot boiler waterCcylinder waterDhot seawater
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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
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单选题The PRIMARY function of a waste heat boiler is to （）.Areduce engine exhaust noiseBreduce engine back pressureCrecover heat which otherwise would be lostDincrease turbocharger efficiency
单选题The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.AcrankshaftBpistonCconnecting rodDbearing
单选题The purpose of compressing the air within the cylinder of a diesel engine is to （）Aproduce the heat for ignitionBdecrease injection lagCincrease ignition delayDaid in exhausting burnt gases
单选题The function of diesel engine piston compression rings is to （）.Aprevent piston side thrustBprevent engine friction lossesCtransmit heat from the piston to the cylinder linerDremove oil from the cylinder combustion space
单选题Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.Areduce electrolytic action on heat exchanger metalsBkeep heat transfer surfaces shiny and cleanCprevent rapid accumulation of marine growthDprovide a protective coating on heat exchanger surfaces
单选题A waste heat boiler is installed on some diesel propelled vessels to （）.Aprovide steam for emergency propulsionBprovide steam for the turbo-generatorCheat the waste water tanksDsteam for warming engines
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