Engineering Chemistry S Datta

FUELS AND COMBUSTION 413
13. (a) What are fuels? How do you classify them? Describe methods employed for ultimate analysis
of coal.
(b) Explain the terms (i) Knocking (ii) Octane number (iii) Cetane number.
14. (a) What is sweetening of petrol? Name the various fractions obtained during the fractional
distillation of crude petroleum oil.
(b) What is the flue gas? How is it analysed?
15. What is meant by cracking of petroleum? Describe various methods used for cracking of petroleum.
16. Write a short note on biogas.
17. Describe fixed bed catalytic cracking.
18. How are gross and net calorific values of a solid fuel determined using a Bomb calorimeter?
19. Give a detailed account of petroleum refining.
20. Give at least four advantages of catalytic cracking over thermal cracking.
21. What is L.P.G.? Give its uses.
22. What do you understand by cetane number of a fuel? Distinguish between high speed diesel and
low speed diesel.
23. Mention advantages and disadvantages of a gaseous fuel.
24. What is the difference between claking coals and coking coals?
25. What is power alcohol? Mention its merits and demerits?
26. Give the constituents and uses of Gobar gas.
27. Discuss giving equations, sketch, manufacture and composition of:
(a) Producer gas (b) Water gas (c) Oil gas.
28. Write a short note on:
Orsat’s method of flue gas analysis and its significance.
29. Write short notes on:
(i) Catalytic converter (ii) Octane and cetane numbers.
30. Write a short note on: Carburetted water gas.
31. What is ultimate analysis of coal?
32. What is the difference between H.T.C. and L.T.C.?
33. Mention the byproducts of coking of coal.
OBJECTIVE TYPE QUESTIONS
1. Which of the fuel gases has highest calorific value?
(a) Water gas (b) Coal gas (c) Producer gas.
2. The calorific value of a coal sample is higher if its
(a) Moisture content is high
(b) Volatile matter is high
(c) Fixed carbon is high.
3. Calorific value of coal is decreased due to presence of
(a) Carbon (b) Sulfur (c) Hydrogen (d) Oxygen.
4. Which of the following contains highest percentage of volatile matter?
(a) Peat (b) Lignite (c) Bituminous coal (d) Anthracite.