Brenner2002. pdf Free download as PDF File. Text File. txt or read online for free. Patch Antenna Pcb Design there. Learn computer organization and architecture multiple choice questions with answers for various academic and competitive exams. Operating System Mcqs With Answers Pdf' title='Operating System Mcqs With Answers Pdf' />TOP I. C. ENGINES Objective Questions and Answers Pdf MCQs 2. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshafta 12b 1c 2d 4e 8. Ans c. 2. In a diesel engine, the fuel is ignited bya sparkb injected fuelc heat resulting from compressing air that is supplied for combustiond ignitione combustion chamber. Ans c. 3. Scavenging air in diesel engine meansa air used for combustion sent under pres sureb forced air for cooling cylinderc burnt air containing products of combustiond air used for forcing burnt gases out of engines cylinder during the exhaust periode air fuel mixture. Ans d. 4. Supercharging is the process ofa supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphereb providing forced cooling airc injecting excess fuel for raising more loadd supplying compressed air to remove combustion products fullye raising exhaust pressure. Ans a. 5. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged a yesb noc to some extentd unpredictablee depends on other factors. Ans b. 6. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is calleda net efficiencyb efficiency ratioc relative efficiencyd overall efficiencye cycle efficiency. I. C. ENGINES Objective Questions and Answers pdf,Interview Questions,multiple choice questions,lab viva,seminar topics,online quiz important free download. The Operating Systems MCQ Bank contains 21 pages in total. The last page contains the correct answers. Ans c. 7. Compression ratio of LC. Ans a. 8. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio isa sameb lessc mored more or less depending on power ratinge unpredictable. Ans c. 9. The calorific value of gaseous fuels is expressed in terms ofa kcalb kcalkgc kcalm. Ans d. 10. If the intake air temperature of I. Operating System Mcqs With Answers Pdf' title='Operating System Mcqs With Answers Pdf' />C. Ans b. 12. All heat engines utilizea low heat value of oilb high heat value of oilc net claorific value of oild calorific value of fuele all of the above. Ans a. 13. An engine indicator is used to determine the followinga speedb temperaturec volume of cylinderd m. I. H. P. e BHP. Ans d. Fuel oil consumption guarantees for I. C. engine are usually based ona low heat value of oilb high heat value of oilc net calorific value of oild calorific value of fuele all of the above. Ans b. 17. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the age increase in efficiency will bea 2b 4c 8d 1. Ans d. 18. In case of gas turbines, the gaseous fuel consumption guarantees are based ona high heat valueb low heat valuec net calorific valued middle heat valuee calorific value. Ans b. 19. In a typical medium speed 4 stroke cycle diesel engine the inlet valvea opens at 2. False/database-management-system-mcqs-multiple-choice-questions-and-answers-quiz-tests-with-answer-keys.jpg' alt='Operating System Mcqs With Answers Pdf' title='Operating System Mcqs With Answers Pdf' />Ans a. The pressure and temperature at the end of compression stroke in a petrol engine are of the order ofa 4 6 kgcm. Cb 6 1. 2 kgcm. Cc 1. Cd 2. 0 3. 0 kgcm. Ce 3. 0 4. 0 kgcm. C. Ans b. 21. The pressure at the end of compression in the case of diesel engine is of the order ofa 6 kgcmb 1. Ans e. 22. The maximum temperature in the I. C. engine cylinder is of the order ofa 5. Cb 1. 00. 0 1. Cc 1. Cd 2. 00. 0 2. Ce 2. CAns d. 23. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut off ratio willa increaseb decreasec be independentd may increase or decrease depending on other factorse none of the above. Ans b. 24. Pick up the wrong statementa 2 stroke engine can run in any directionb In 4 stroke engine, a power stroke is obtained in 4 strokesc thermal efficiency of 4 stroke engine is more due to positive scavengingd petrol engines work on otto cyclee petrol engines occupy more space than diesel engines for same power output. Ans e. 25. Combustion in compression ignition engines isa homogeneousb heterogeneousc both a and bd laminare turbulent. Ans b. 26. The fuel in diesel engine is normally injected at pressure ofa 5 1. Ans d. 27. The specific fuel consumption per BHP hour for diesel engine is approximatelya 0. Ans b. 28. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceeda 8. Cb 1. 20Cc 1. Cd 2. Ce 3. C. Ans c. 30. Crankcase explosion in I. C. engines usuall occurs asa first a mild explosion followed by a bi explosionb first a big explosion followed by a mil explosionc both mild and big explosions occi simultaneouslyd never occurse unpredictable. Ans a. 31. Compression loss in I. C engines occurs dutoa leaking piston ringsb use of thick head gasketc clogged air inlet slotsd increase in clearance volume caused b bearing bushing weare all of the above. Ans e. 32. The specific fuel consumption per BH hour for a petrol engine is approximatelya 0. Ans c. 33. The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion isa moreb lossc samed may be more or less depending on engine capacitye unpredictable. Ans b. 34. The inlet value of a four stroke cycle I. C engine remains open for nearlya 1. Ans c. 35. Which of the following is not an interns combustion enginea 2 stroke petrol engineb 4 stroke petrol enginec diesel engined gas turbinee steam turbine. Ans e. 36. Pick up the false statementa Thermal efficiency of diesel engine i about 3. Theoretically correct mixture of air am petrol is approximately 1. High speed compression engines operate on dual combustion cycled Diesel engines are compression ignition enginese S. I. engines are quality governed engines. Ans e. 37. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder thea exhaust will be smokyb piston rings would stick into piston groovesc exhaust temperature will be highd engine starts overheatinge scavenging occurs. Ans e. 38. The output of a diesel engine can be increased without increasing the engine revolution or size in following waya feeding more fuelb increasing flywheel sizec heating incoming aird scavenginge supercharging. Ans e. 39. It the temperature of intake air in IC engines is lowered, then its efficiency willa increaseb decreasec remain samed increase upto certain limit and then decreasee decrease upto certain limit and then in crease. Ans a. 40. In a typical medium speed 4 stroke cycle diesel enginea compression starts at 3. Ans a. 41. For the same compression ratioa Otto cycle is more efficient than the Dieselb Diesel cycle is more efficientthan Ottoc both Otto and Diesel cycles are, equally efficientd compression ratio has nothing to do with efficiencye which is more efficient would depend on engine capacity. Ans a. 42. The precess of breaking up or a lipuid into fine droplets by spraying is calleda vaporisationb carburetionc ionisationd injectione atomisation. Ans e. 43. As a result of detonation in an I. C. engine, following parameter attains very high valuea peak pressureb rate of rise of pressurec rate of rise of temperatured peak temperaturee rate of rise of horse power. 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