Fuels and Combustion problems
- 1. Which of the following is not used as a binder in coal briquetting?
Options- A. Tar
- B. Molasses
- C. Pitch
- D. Line Discuss
Correct Answer: Line
- 2. Gross & net calorific value is the same for
Options- A. blast furnace gas
- B. coke oven gas
- C. L.D. converter gas
- D. none of these Discuss
Correct Answer: L.D. converter gas
- 3. Stack heat losses can be minimised by
Options- A. controlling the excess air.
- B. oxygen enrichment of combustion air.
- C. using low c.v. fuels.
- D. maintaining proper draft in the furnace. Discuss
Correct Answer: controlling the excess air.
- 4. Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Options- A. fuel
- B. air
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 5. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Options- A. <120
- B. >120
- C. <90
- D. 90-110 Discuss
Correct Answer: >120
- 6. In high temperature carbonisation of coal compared to low temperature carbonisation
Options- A. yield of ammonia is less.
- B. aromatic content of tar is low.
- C. H2 content in the coke oven gas is more.
- D. calorific value of the coke oven gas is lower. Discuss
Correct Answer: H2 content in the coke oven gas is more.
- 7. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.
Options- A. 60
- B. 160
- C. 500
- D. 750 Discuss
Correct Answer: 160
- 8. Which of the following gaseous fuels has the lowest calorific value?
Options- A. Gobar gas
- B. Refinery gas
- C. Converter gas
- D. Blast furnace gas Discuss
Correct Answer: Blast furnace gas
- 9. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
Options- A. 100 to 150
- B. 350 to 450
- C. 550 to 650
- D. 700 to 850 Discuss
Correct Answer: 350 to 450
- 10. Gross and net calorific value of a fuel will be the same
Options- A. if its ash content is zero.
- B. ifits carbon content is very low.
- C. if its hydrogen/hydrogen compound content is zero.
- D. under no circumstances. Discuss
Correct Answer: if its hydrogen/hydrogen compound content is zero.
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