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4/1/2016 MEO Class 4 Exam
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INTERNAL COMBUSTION ENGINE 2006 OBJECTIVE PAPER
Q To reduce sulphur corrosion of main engine componentsa. Run at normal loadb. Atomizing pressure of fuelc. Rotor in exhaust valved. Fuel feed rate in purifier and purifier in seriesAnswerA
Q which of the following statement is true if the oil temperature is allowed to becomeexcessively high in the heater?a) excessive temperature will increase oil viscosity that results to poor combustionb) excessive temperature will cause the oil to crystallize resulting in pulsating firesc) the fuel will carbonize and its heating will be reduced.d) the fuel will ignite even it has not reached point of ignition.AnswerC
QWhich of the following statements correctly describes the phenomenon of surging in a2stroke crosshead type engine?A.Due to sudden increase in engine load the exhaust gases may flow back throughscavenge ports causing surgeB.Due to sudden decrease in engine load the turbocharger pressure ratio drops . Thiscauses high pressure downstream of T/C in scavenge trunk causing flow reversal ofscavenge airC.Due to sudden increase in engine load , the T/C turbine rpm may increase suddenlyincreasing the compressor pressure ratio to surgeD.Due to sudden decrease in engine load , the turbocharger may stall as the higherpressure downstream in exhaust system may cause reversal of flow of exhaust gasesAnswerB
Q Exhaust grouping in main engine is for1 Better starting2 No need for auxiliary blowers3 Pure prime4 Cost Saving
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4/1/2016 MEO Class 4 Exam
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AnswerBoth 1 and 2 but most appropriate is 2
Q Exhaust Grouping is required in case of ______________ turbocharging in order to_____________________A.Constant pressure , prevents shockwave generationB.Pulse pressure , prevent interference with scavenging of other cylindersC.Constant pressure, prevent interference with scavenging of other cylindersD.Pulse pressure , prevents shockwave generationAnswerB
Q The temperature, at which a fuel will start to burn under given conditions, is called its,ignition temperature. This temperature varies greatly with(a) Composition of the airfuel mixture.(b) Amount of excess air.(c) Size, shape and temperature of the compression space.(d) All the aboveAnswerD
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