IC Engines Practice Set-2 Published November 10, 2021 · Updated November 10, 2021 123456789101112Show paginator Hide paginator 50%Page 1 of 21. Number of working strokes per min. for a two stroke cycle engine is _________ the speed of the engine in r.p.m.TwiceEqual toOne-halfFour-times2. In petrol engines, advancing of the spark timing will _________ the knocking tendency.IncreaseNone of theseDecreaseNot effect3. The inlet valve of a four stroke cycle internal combustion engine remains open for270°230°130°180°4. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is calledEfficiency ratioRelative efficiencyOverall efficiencyNet efficiency5. Which of the following is not an intern’s combustion engine?4-stroke petrol engineSteam turbineDiesel engine2-stroke petrol engine6. A supercharged engine as compared to an ordinary engineIs lighterConsumes less lubricating oilAll of theseRequires smaller foundation7. The maximum propulsive efficiency of a turbojet engine is at a speed of1000 km/h2000 km/h3000 km/h2400 km/h8. In a naturally aspirated diesel engine, the air is supplied byA centrifugal blowerA vacuum chamberAn injection tubeA supercharger9. Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio providedCannot work as it is impossibleIt is properly designedBest quality fuel is usedFlywheel size is proper10. Flash point of fuel oil isTemperature at which it solidifies or congealsIndicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled offMinimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flameTemperature at which it catches fire without external aidPage 2 of 211. The spark ignition engines are governed byC) Quantitative governingD) Combination of (B) and (C)A) Hit and miss governingB) Qualitative governing12. The minimum cranking speed in case of petrol engine is aboutOne fourth of operating speed60 - 80 rpm250 - 300 rpmHalf the operating speed Loading... Share this Now with Friends:WhatsAppTelegramMore Related
