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4/1/2016 MEO Class 4 Exam http://class4exam.com/ic_2006.html 1/2 INTERNAL COMBUSTION ENGINE 2006 OBJECTIVE PAPER Q To reduce sulphur corrosion of main engine components a. Run at normal load b. Atomizing pressure of fuel c. Rotor in exhaust valve d. Fuel feed rate in purifier and purifier in series AnswerA Q which of the following statement is true if the oil temperature is allowed to become excessively high in the heater? a) excessive temperature will increase oil viscosity that results to poor combustion b) excessive temperature will cause the oil to crystallize resulting in pulsating fires c) 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 a 2stroke crosshead type engine? A.Due to sudden increase in engine load the exhaust gases may flow back through scavenge ports causing surge B.Due to sudden decrease in engine load the turbocharger pressure ratio drops . This causes high pressure downstream of T/C in scavenge trunk causing flow reversal of scavenge air C.Due to sudden increase in engine load , the T/C turbine rpm may increase suddenly increasing the compressor pressure ratio to surge D.Due to sudden decrease in engine load , the turbocharger may stall as the higher pressure downstream in exhaust system may cause reversal of flow of exhaust gases AnswerB Q Exhaust grouping in main engine is for 1 Better starting 2 No need for auxiliary blowers 3 Pure prime 4 Cost Saving Prepare for MMD Class 4 Objective HOME OBJECTIVE PAPERS ORALS APTITUDE PRESENTATIONS FORUMS U.S VISA LOG IN

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4/1/2016 MEO Class 4 Exam

http://class4exam.com/ic_2006.html 1/2

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

Prepare forMMD Class 4Objective

HOME OBJECTIVE PAPERS ORALS APTITUDE

PRESENTATIONS FORUMS U.S VISA LOG IN

4/1/2016 MEO Class 4 Exam

http://class4exam.com/ic_2006.html 2/2

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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