The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.A.gas compositionB.gas temperatureC.pressureD.timing

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.

A.gas composition

B.gas temperature

C.pressure

D.timing


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A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.A.engine overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure

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For a diesel engine, individual cylinder performance is commonly determined by exhaust gas()Achemical analysisBback pressure readingsCpyrometer readingsDinfrared analysis

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The main purpose of warming the parts of the main engine is ()Ato reduce heat stressBto reduce low temperature corrosionCto improve firing and starting performanceDfuel saving

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The main purpose of inspection for a running diesel engine is()Atesting for the mechanical load and the thermal loadBinspecting thermal and mechanical condition of the engineCinspecting each system and exhaust temperatureDtesting for compress pressure and explosion pressure

单选题In a trunk type diesel engine piston, the thickness of the head or crown is determined by the() Ⅰ.statically balanced Ⅱ.heat dissipation requirementAⅠ onlyBⅡ onlyCboth Ⅰ and ⅡDneither Ⅰ nor Ⅱ

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Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because ()Abearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedBbearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedCthe maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineDtwo-stoke/cycle diesel engines require more complicated lubrication piping

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Fins are installed on the fireside of water-tubes used in waste boiler to()Adecrease the velocity of gases flowing past the tubesBincrease the rate of heat transferCreduce accumulations carbon depositsDdirect the flow of gases

单选题If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching ().Athe bad smokeBthe smoky exhaustCthe exhaust temperatureDthe peak pressure

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In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the ().Asuction pressure regulatorBthermostatic bypass valveCsea water temperatureDwater level in the expansion tank

单选题Which statement about diesel engine combustion is true?()ACombustion does not begin until the piston starts down on the power strokeBMaximum combustion pressure is reached before TDCCTurbulence in the cylinder causes a delay in ignitionDMaximum cylinder firing pressure is not developed until the piston passes TDC

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While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that ()Athe bearing had been overheatedBwater was present in the oilCthe lube oil was not being properly filteredDthe maximum allowable bearing pressure had been exceeded

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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

单选题A SECONDARY function of a waste heat boiler is to ().Areduce engine exhaust noiseBreduce engine back pressureCincrease engine cycle efficiencyDincrease turbocharger efficiency

单选题The starting air bottle should be pumped up to maximum pressure by the () before start of the engine.Aair compressorBrefrigeration compressorCvacuum pumpDpurifier