UNTVERSITI TUN HUSSEIN ONN NG.LAYSLATutorial I

INTERNAL COMBUSTTON ENGINE @DE,10603)sEM 1I 2013/2014

1. List five differcnces between SI engines and CI engines.

2. A four-stroke cycle engine mayor may not have a pressure boost (supercharger,

turbocharger) in the intake system. why must a two-stroke cycle engine always have an

intake pressure boost?

3 . State two basics engine designs and sketch the ir configurations

4. with the sketches define the following: Bore, stroke, displacement volume, clearance

volnme, compression ratio, cubic capacily and combustion chamber.

5. What is meant by mean piston speed? Explain its importance

6. Listtwoadvantagesofatwo-strokecycleengineoverafour-strokecycleengine.List

two advantages ofa four-stroke cycle engine over a two-stroke cycle engine.

7. Define the following efficiencies ; indicaled thermal efiiciency, brake thermal effrciency,

mechanical efficiency, relative efiiciency and volumetric etlciency

8. Explain briefly; mean effective pressure, specific output, specific fuel consumptior, fuel-

air ratio and heating value of the fuel.

9. (a) Why do most very small engines operate on atwo-stroke cycle? (b) Why do most

very large engines operate on atwo-stroke cycre? (c) why do most automobile engines

operate on a fom-stroke cycle? (d) why would it be desirable to operate automobile

engines on atwo-stroke cycle?

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