Discussion
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- Question
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
- Correct Answer
- Carbon
- 1. 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
- 2. 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
- 3. Size of blast furnace grade coke is __________ mm.
Options- A. 25-80
- B. 0-15
- C. 15-25
- D. >100 Discuss
- 4. 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. Discuss
- 5. 'Wobbe index' is a characteristic of
Options- A. solid fuels
- B. gaseous fuels
- C. liquid fuels
- D. fat coals Discuss
- 6. 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
- 7. Carbon Content by weight in air dried wood may be about __________ percent.
Options- A. 10
- B. 25
- C. 50
- D. 80 Discuss
- 8. Coke oven gas consists mainly of
Options- A. H2, & CH4
- B. CO, & CO2
- C. H2, & CO
- D. CH4, & CO Discuss
- 9. During combustion of gaseous fuels, deficiency of air
Options- A. lengthens the flame.
- B. tends to shorten the flame.
- C. does not affect the flame length.
- D. increases the flame temperature. Discuss
- 10. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
Options- A. high rank coals have higher amount of volatile matter.
- B. ratio of fixed carbon to volatile matter increases.
- C. oxygen content progressively decreases.
- D. calorific value of the coal increases. Discuss
Fuels and Combustion problems
Search Results
Correct Answer: both (a) and (b).
Correct Answer: both (b) and (c).
Correct Answer: 25-80
Correct Answer: risk of explosion.
Correct Answer: gaseous fuels
Correct Answer: 10
Correct Answer: 50
Correct Answer: H2, & CH4
Correct Answer: lengthens the flame.
Correct Answer: ratio of fixed carbon to volatile matter increases.
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