Fuels and Combustion problems
- 1. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?
Options- A. Benzol
- B. Pitch-cresosote mixture (PCM)
- C. Napthalene
- D. Ethylene Discuss
Correct Answer: Ethylene
- 2. Combustion reaction of fuels is a/an __________ reaction.
Options- A. auto catalytic
- B. exothermic
- C. endothermic
- D. none of these Discuss
Correct Answer: exothermic
- 3. Higher efficiency in the combustion of solid fuel can not be achieved by
Options- A. proper fuel preparation.
- B. keeping the flue gas exhaust temperature very high.
- C. adopting efficient-fuel firing technique & equipment.
- D. supplying correct quantity of combustion air. Discuss
Correct Answer: keeping the flue gas exhaust temperature very high.
- 4. High temperature in gasification of coal favours
Options- A. high production of CO2.
- B. low production of CO2.
- C. high production of CO.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 5. Which of the following is used for making the explosive 'TNT'?
Options- A. Benzol
- B. Toluene
- C. Pyridine
- D. Cerosote Discuss
Correct Answer: Toluene
- 6. Gray King Assay and Swelling Index of a coal is a measure of its
Options- A. swelling characteristics.
- B. abradability.
- C. agglutinating properties.
- D. resistance to impact breakage. Discuss
Correct Answer: swelling characteristics.
- 7. Junker's calorimeter is used to determine the calorific value of
Options- A. pulverised coal
- B. gaseous fuels
- C. fuel oil
- D. none of these Discuss
Correct Answer: gaseous fuels
- 8. 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
Correct Answer: All (a), (b) and (c).
- 9. 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
Correct Answer: in between 37 & 71%
- 10. 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
Correct Answer: both (a) and (b).
More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.