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IC Engine Practice Test: Combustion and Combustion Chambers
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Combustion and Combustion Chambers topics include: Combustion, abnormal combustion, combustion in SI and CI engine, knocking in SI engine and delay period. A combustion chamber is a space within an engine where fuel is mixed with oxygen and ignited. The energy released from the combustion is captured and harnessed.  The combustion chamber is also known as a burner or combustor. The resulting high-temperature exhaust gas is used to turn the power turbine, which produces mechanical work to move the compressor.  The combustion chamber can be divided into five major components: The injector... Show more
IC Engine Practice Test: Combustion and Combustion Chambers
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25 Questions

1. The delay period ___________ with load.
2. In a homogeneous gas mixture the fuel and oxygen molecules are more or less, uniformly distributed.
3. Swirl is the rotational flow of charge within the cylinder about the axis.
4. The time for which delay period occurs decreases with ___________ in engine speed.
5. The ____________ rate is the result of a purely chemical combination process in which the flame eats it way into the unburned charge.
6. Increase in compression ratio ___________ delay period.
7. ____________ knock occurs when the delay period is excessively long so that there is a large amount of fuel in the cylinder for the simultaneous explosion phase.
8. A pre-combustion chamber gives a shorter delay compared to an open type of combustion chamber.
9. What are the effects of knocking?
10. Increase of pressure increases the self ignition temperature and the induction period.
11. At constant speed, delay period is proportional to the delay angle.
12. What are the phases of CI engine combustion?
13. The rate of pressure rise per degree of crank angle is then so great that an audible knocking sound occurs.
14. If the delay is too short the amount of fuel available for the simultaneous explosion is too great and the resulting pressure rise is too rapid.
15. In CI engines, abnormal combustion is not a great problem as in SI Engines.
16. Abnormal combustion knock produced by surface ignition in SI engines is not harmful as normal combustion knock.
17. Knock is a function of the fuel chosen and may be avoided by choosing a fuel with characteristics that do not give too long a delay period.
18. A pre-combustion chamber gives a shorter delay compared to an open type of combustion chamber.
19. In the CI engine, the intake is air alone and the fuel is injected at high pressure in the form of fine droplets at the start of compression.
20. Delay period serves a useful purpose in that it allows the fuel jet to penetrate well into the combustion space.
21. The conditions necessary for combustion are the presence of combustible mixture and some means of initiating the process.
22. Detonation cannot be prevented by reducing peak cylinder pressure.
23. Homogeneous mixture is formed inside the engine cylinder and the combustion is initiated inside the cylinder at a particular instant towards the end of the compression stroke.
24. Swirl ratio is defined as the ratio of air rotational speed to crankshaft rotational speed.
25. The process of combustion in engines generally takes place either in a homogeneous or a heterogeneous fuel vapour air mixture depending on the type of engine.

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