Question Bank: Important Long Questions

Chapter 17

INTERNAL COMBUSTION ENGINES

I. Answer the following:

1. What is a heat engine? How do you classify heat engines?

 2. List out any four classification of IC Engine

3. Describe the principal parts and functions of a four stroke I.C. engine with a sketch.

4. Describe the principal parts and functions of a two stroke I.C. engine with a sketch

5. Differentiate engines two-stroke from four-stroke engines.

6. Briefly explain the various parts of internal combustion engines.

7. Define the terms: Stroke, Top Dead Center, Bottom Dead Center, Compression Ratio, Air Fuel Ratio, Stroke Volume, Brake Horse Power and Thermal Efficiency. 8. Explain the working of a four stroke petrol engine with the help of PV diagram. 9. Explain the working of a four stroke diesel engine with the help of PV diagram. 10. What do you understand by scavenging?

11. Draw and explain the sequence of operations of a two stroke cycle petrol engine.

12. Draw and explain the sequence of operations of a two stroke cycle diesel engine.

13. Why are two stroke engines preferred for two wheelers?

14. State the merits and demerits of two-stroke cycle engine.

15. Compare and contrast four stroke cycle engines with two stroke cycle engines. State their relative merits and demerits.

16. Discuss the merits and demerits of diesel engine over petrol engine.

 17. Describe with a sketch the design of a single jet carburetor.

 18. Sketch and explain the working of a diesel fuel pump.

19. Explain the working principle of the fuel injector with a neat diagram.

 20. Describe the working principle of magneto ignition system.

 21. Draw a schematic circuit diagram of a coil (battery) ignition system and label all the components. State the functions of each component.

 22. Discuss briefly the ignition system of SI engine.

 23. Explain the working principle of spark plug with a neat diagram.