Discussion
Home ‣ Chemical Engineering ‣ Fuels and Combustion Comments
- Question
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.
- Correct Answer
- controlling the excess air.
- 1. 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
- 2. Which of the following is not used as a binder in coal briquetting?
Options- A. Tar
- B. Molasses
- C. Pitch
- D. Line Discuss
- 3. During Joule-Thomson expansion of gases
Options- A. enthalpy remains constant.
- B. entropy remains constant.
- C. temperature remains constant.
- D. none of these. Discuss
- 4. Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
Options- A. isothermal
- B. adiabatic
- C. isentropic
- D. none of these Discuss
- 5. Out of the following refrigeration cycles, which one has maximum COP?
Options- A. Air cycle
- B. Carnot cycle
- C. Ordinary vapor compression cycle
- D. Vapor compression with a reversible expansion engine Discuss
- 6. 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
- 7. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Options- A. <120
- B. >120
- C. <90
- D. 90-110 Discuss
- 8. 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
- 9. 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
- 10. 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
Fuels and Combustion problems
Search Results
Correct Answer: L.D. converter gas
Correct Answer: Line
Correct Answer: enthalpy remains constant.
Correct Answer: isothermal
Correct Answer: Carnot cycle
Correct Answer: both (a) & (b)
Correct Answer: >120
Correct Answer: H2 content in the coke oven gas is more.
Correct Answer: 160
Correct Answer: Blast furnace gas
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