Reactivity with O₂
Abradability
Phosphorus content
Volatile matter content
✅ The correct answer is option A.
Fuel and Combustion MCQs
422. High sulphur content in a fuel __________ of the flue gases.
Decreases the dew point
Increases the dew point
Reduces the combustion efficiency by limiting the permissible temperature reduction
Both B & C
✅ The correct answer is option D.
423. The pyragallol solution used in orsat apparatus can absorb
Only O₂
Both O₂ and CO₂
Both O₂ and CO
All of the above
✅ The correct answer is option B.
424. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
1000
4000
8000
15000
✅ The correct answer is option C.
425. Natural draught produced by a chimney depends upon the
Density of the chimney gases
Height of the chimney
Both A & B
Neither A nor B
✅ The correct answer is option C.
426. Which of the following is not endothermic?
Cracking
Reforming
Gasification
Partial oxidation
✅ The correct answer is option D.
427. In high temperature carbonisation of coal compared to low temperature carbonisation
Yield of ammonia is less
Aromatic content of tar is low
H₂ content in the coke oven gas is more
Calorific value of the coke oven gas is lower
✅ The correct answer is option C.
428. Calorific value of dry wood may be around __________ Kcal/kg.
5
50
500
5000
✅ The correct answer is option A.
429. Fuel consumption in coke making can be reduced by
Preheating, blending and de-ashing the coal
Stamped charging of coal
Dry quenching of coke
All of the above
✅ The correct answer is option D.
430. Which of the following is not a binder for coal briquetting?
Coal tar
Bitumen
Molasses
None of these
✅ The correct answer is option D.