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- Question
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Options- A. caking index.
- B. yield of carbonised products.
- C. friability & oxygen content.
- D. calorific value.
- Correct Answer
- friability & oxygen content.
- 1. Higher percentage of ash in coal meant for the production of metallurgical grade coke
Options- A. decreases the hardness of coke.
- B. decreases the abrasion resistance of coke.
- C. causes brittleness in steel.
- D. none of these. Discuss
- 2. A coal having high amount of volatile matter
Options- A. would require smaller combustion chamber.
- B. produces very little of tar and gas on carbonisation.
- C. ignites easily and burns with long smoky flame.
- D. all (a), (b) and (c). Discuss
- 3. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
Options- A. no possibility of obtaining complete combustion at high temperature.
- B. always loss of heat from the flame.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 4. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.
Options- A. < 37%
- B. >71%
- C. in between 37 & 71%
- D. none of these Discuss
- 5. Which of the following accentuates clinker-ing trouble on furnace grate burning coal?
Options- A. Low reactivity of carbonised residue containing high proportions of iron & sulphur.
- B. Low forced draught and fuel bed temperature.
- C. Thick fire bed and preheated primary air.
- D. All (a), (b) and (c). Discuss
- 6. A coal with high ash content is undesirable, as
Options- A. it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber.
- B. the ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash.
- C. the ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer.
- D. all (a), (b) and (c). Discuss
- 7. Laboratory gas is obtained by the cracking of
Options- A. gasoline
- B. diesel
- C. fuel oil
- D. kerosene Discuss
- 8. When incomplete combustion loss is high, the flue gas analysis shows large amount of
Options- A. CO2
- B. CO
- C. O2
- D. C Discuss
- 9. The internal energy of the combustion products is __________ compared to that of reactants.
Options- A. more
- B. less
- C. equal
- D. more or less ; (depends on the state of fuel.) Discuss
- 10. Combustion of pulverised coal as compared to that of lump coal
Options- A. develops a non-luminous flame.
- B. develops a low temperature flame.
- C. can be done with less excess air.
- D. provides a lower rate of heat release. Discuss
Fuels and Combustion problems
Search Results
Correct Answer: none of these.
Correct Answer: all (a), (b) and (c).
Correct Answer: both (a) and (b).
Correct Answer: in between 37 & 71%
Correct Answer: All (a), (b) and (c).
Correct Answer: all (a), (b) and (c).
Correct Answer: kerosene
Correct Answer: CO
Correct Answer: less
Correct Answer: can be done with less excess air.
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