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单选题 Which of the following statements concerning fire-tube boilers is correct
学科：轮机英语
时间：2024-05-12 16:52:56
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题目1单选题
When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used______A. at high loads to prevent overheatingB. at low loads to prevent corrosion in the boilerC. during periods of high steam demandD. when the turbocharger is in operation
题目2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
题目3单选题
Bottom blow valves are installed on auxiliary water-tube boilers to _____A. remove suspended and precipitated solids from the boiler waterB. completely drain the boiler in an emergency situationC. prevent hardened scale deposits in the water drumD. remove floating impurities from the oily water surface
题目4单选题
Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in ____A. increased fuel consumptionB. increased feed water consumptionC. fuel pump failureD. combustion control system failure
题目5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
题目6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
题目7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
题目8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
题目9单选题
Which of the following statements concerning fire-tube boilers is correctA. Combustion gases flow through the tubesB. Flames impinge on the tubesC. Combustion occurs in the tubesD. Water flows through the tubes
题目10单选题
The purpose of the safety relief valves installed on an auxiliary boiler is to________A. relieve excess fuel oil pressure during the "off" fire cycleB. admit water to the dry pipeC. throttle the forced draft fan output for proper combustionD. reduce excess steam pressure in the boiler
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