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IC Engine Practice Test: Ignition System
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Ignition topics include: Requirements and battery of ignition systems, magneto ignition systems, ignition timing and energy parameters and spark mechanism. The ignition system is a key component of a vehicle that helps start the engine. It creates a spark that ignites the fuel in the engine, which starts the combustion process.  Here are some basics of the ignition system: Ignition coil: Changes the low battery voltage into the power needed to reach the spark plug, reach the fuel, and start the engine Distributor ignition: Takes high voltage and divides it up, sending out impulses to your... Show more
IC Engine Practice Test: Ignition System
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25 Questions

1. The main function of a ___________ is to conduct the high potential from the ignition system into the combustion chamber.
2. In two wheelers magneto ignition system is favoured due to ____________ weight and less maintenance.
3. In battery ignition system, the energy required for producing spark is obtained from a _____________ battery.
4. In transistorized coil ignition system, the life of spark plug is extended.
5. Ignition timing is the correct instant for the introduction of spark near the end of compression stroke in the combustion chamber.
6. If the engine is operating with richer mixtures the optimum spark timing must be _____________
7. The magneto is best at high speeds and therefore is widely used for sports and racing cars, aircraft engines. etc.
8. The pressure, temperature and density of the mixture between the spark plug electrodes have a considerable influence on the __________ required to produce a spark.
9. A spark can be caused by applying a sufficiently low voltage between two electrodes separated by a gap.
10. Battery is connected to the primary winding of the ignition coil through an ignition switch and blast resistor.
11. If the spark energy exceeds 40 mJ and the duration is longer than 0.5 ms, reliable ignition is obtained.
12. As air is poor conductor of electricity an air gap in an electric circuit acts as a high _____________
13. The primary voltage increases as the engine speed increases due to the limitations in the current switching capability of the breaker system.
14. An eight cylinder engine running at 3000 rpm requires __________ spark per minute.
15. An ignition system should function efficiently over the entire range of engine speed.
16. What is the standard firing order in a four cylinder petrol engine?
17. With magneto there is no starting difficulty.
18. An ignition system should be cheap and convenient to handle.
19. The diaphragm is so coupled with the contact breaker that when induction pressure is reduced, the angle of advance _____________
20. The main advantage of the high tension magneto ignition system lies in the fact that the wirings carry a very high voltage and thus there is a strong possibility of causing engine misfire due to leakage.
21. The spark plug must withstand pressures up to at least __________ bar.
22. What are the essential components of a battery ignition system?
23. The total enthalpy required to cause the flame to be self sustaining and promote ignition, is given by the product of the surface area of the spherical flame and the enthalpy per unit area.
24. The lead acid battery is used in ______________ duty commercial vehicles.
25. A blast resistor is provided in parallel with the primary winding to regulate the primary current.

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