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- Question
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
Options- A. requirement of large volume combustion chamber.
- B. risk of explosion.
- C. chances of clinker formation.
- D. incomplete combustion of coal.
- Correct Answer
- risk of explosion.
- 1. 'Wobbe index' is a characteristic of
Options- A. solid fuels
- B. gaseous fuels
- C. liquid fuels
- D. fat coals Discuss
- 2. Pick out the wrong statement.
Options- A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
- B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
- C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
- D. Maximum yield of naphthalene is obtained on distillation of crude oil. Discuss
- 3. Combustion of pulverised coal as compared to that of lump coal
Options- A. develops a non-luminous flame.
- B. develops a low temperature flame.
- C. can be done with less excess air.
- D. provides a lower rate of heat release. Discuss
- 4. The internal energy of the combustion products is __________ compared to that of reactants.
Options- A. more
- B. less
- C. equal
- D. more or less ; (depends on the state of fuel.) Discuss
- 5. When incomplete combustion loss is high, the flue gas analysis shows large amount of
Options- A. CO2
- B. CO
- C. O2
- D. C Discuss
- 6. Size of blast furnace grade coke is __________ mm.
Options- A. 25-80
- B. 0-15
- C. 15-25
- D. >100 Discuss
- 7. Bituminous coal
Options- A. ignites less easily than anthracite.
- B. is generally coking.
- C. burns with smoky yellow flame.
- D. both (b) and (c). Discuss
- 8. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
Options- A. to check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls.
- B. because, it alone produces unreactive coke.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 9. Which of the following constituents of coal is the most important in the production of coke?
Options- A. Moisture
- B. Ash
- C. Volatiles
- D. Carbon Discuss
- 10. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
Options- A. 0.5
- B. 10
- C. 50
- D. 500 Discuss
Fuels and Combustion problems
Search Results
Correct Answer: gaseous fuels
Correct Answer: The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
Correct Answer: can be done with less excess air.
Correct Answer: less
Correct Answer: CO
Correct Answer: 25-80
Correct Answer: both (b) and (c).
Correct Answer: both (a) and (b).
Correct Answer: Carbon
Correct Answer: 10
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