Fuels and Combustion problems
- 1. The gas which contributes maximum to the heating value of natural gas is
Options- A. CO
- B. CO2
- C. H2
- D. CH4 Discuss
Correct Answer: CH4
- 2. Low temperature carbonisation
Options- A. is mainly for producing the smokeless domestic coke.
- B. is meant for the production of 'metallurgical coke'.
- C. produces higher quantity of gas than high temperature carbonisation.
- D. produces less quantity of tar than high temperature carbonisation. Discuss
Correct Answer: is mainly for producing the smokeless domestic coke.
- 3. Presence of free moisture in coal during its high temperature carbonisation
Options- A. reduces the coking time.
- B. protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- C. increases the loss of fine coal dust from the ovens when charging.
- D. none of these. Discuss
Correct Answer: protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- 4. Natural draught produced by a chimney depends upon the
Options- A. density of the chimney gases.
- B. height of the chimney.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b).
- 5. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Options- A. 1000
- B. 4000
- C. 6000
- D. 8000 Discuss
Correct Answer: 4000
- 6. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Options- A. the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
- B. it reduces its calorific value tremendously.
- C. it reduces its flame temperature tremendously.
- D. there are chances of explosion during preheating. Discuss
Correct Answer: the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
- 7. Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O)?
Options- A. Blast furnace coke
- B. Low temperature coke
- C. Anthracite coal
- D. Sub-bituminous coal Discuss
Correct Answer: Low temperature coke
- 8. Which of the following is not a product of tar distillation?
Options- A. Phenol & naphthalene
- B. Benzol & pitch
- C. Anthracene & creosote
- D. None of these Discuss
Correct Answer: None of these
- 9. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
Options- A. sulphur
- B. oxygen
- C. hydrogen
- D. carbon Discuss
Correct Answer: oxygen
- 10. A coal containing very high percentage of durain is called __________ coal.
Options- A. bright
- B. splint
- C. non-banded
- D. boghead Discuss
Correct Answer: splint
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