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- Question
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
- Correct Answer
- gaseous fuels
- 1. 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
- 2. Which of the following is used for making the explosive 'TNT'?
Options- A. Benzol
- B. Toluene
- C. Pyridine
- D. Cerosote Discuss
- 3. 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
- 4. 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
- 5. Combustion reaction of fuels is a/an __________ reaction.
Options- A. auto catalytic
- B. exothermic
- C. endothermic
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Fuels and Combustion problems
Search Results
Correct Answer: swelling characteristics.
Correct Answer: Toluene
Correct Answer: both (b) and (c).
Correct Answer: keeping the flue gas exhaust temperature very high.
Correct Answer: exothermic
Correct Answer: All (a), (b) and (c).
Correct Answer: in between 37 & 71%
Correct Answer: both (a) and (b).
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these.
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