Potassium hydroxide
Dilute potassium carbonate
Cuporus chloride
Alkaline pyragllol solution
✅ The correct answer is option A.
Engineering
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3452. Use of preheated air for combustion of fuel in the furnace, increases the
Scale losses of the furnace stock
Calorific value of the fuel
Flame temperature
None of these
✅ The correct answer is option C.
3453. Low temperature oxidation of coal is accelerated by the
Storage in large heaps
Storage in compressed piles
Absence of porous or friable particles
All of the above
✅ The correct answer is option A.
3454. Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?
Blast furnace gas
Natural gas
Producer gas
Water gas
✅ The correct answer is option B.
3455. 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.
3456. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
1000
4000
8000
15000
✅ The correct answer is option C.
3457. Micum Index of a coke is a measure of its
Reactivity
Porosity
Bulk density
Hardness & strength
✅ The correct answer is option D.
3458. Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.
6
12
18
24
✅ The correct answer is option D.
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.
3460. Which of the following is not endothermic?
Cracking
Reforming
Gasification
Partial oxidation
✅ The correct answer is option D.