3459. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
1000
4000
6000
8000
✅ The correct answer is option B.
3464. Too much of excess air in combustion results in high
Fuel consumption for the same heat load
Stack gas temperature
Percentage of oxygen in flue gases
All of the above
✅ The correct answer is option D.
3469. Calorific value of bituminous coal may be around __________ Kcal/kg.
500
1500
6500
20000
✅ The correct answer is option C.
3474. If oxygen content in the flue gas rises too high, fuel is being wasted by
Incomplete combustion
Dry gas/stack gas loss
Moisture loss
None of these
✅ The correct answer is option B.
3481. For maximum discharge through a chimney, its height should be
200 meters
Infinitely long
More than 105.7 metres
Equal to the height of the hot gas column producing draught
✅ The correct answer is option D.
3447. Yield of pitch from distillation of high temperature tar is around __________ percent.
10
25
65
90
✅ The correct answer is option C.
3451. In flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by
Potassium hydroxide
Dilute potassium carbonate
Cuporus chloride
Alkaline pyragllol solution
✅ The correct answer is option A.
3456. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
1000
4000
8000
15000
✅ The correct answer is option C.
3460. Which of the following is not endothermic?
Cracking
Reforming
Gasification
Partial oxidation
✅ The correct answer is option D.
3461. Calorific value of dry wood may be around __________ Kcal/kg.
5
50
500
5000
✅ The correct answer is option A.