3271. Largest constituent of blast furnace gas is
N₂
CO
CO₂
H₂
✅ The correct answer is option A.
Chemical Engineering
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3272. The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .
1800
800
4500
10000
✅ The correct answer is option A.
3273. Which one contains maximum percentage of Al2O3 ?
Firebrick
Sillimanite
Magnesite
Aluminous firebrick
✅ The correct answer is option B.
3274. Steam is intermittently admitted into the fuel bed during the production of producer gas to
Convert CO to CO₂
Increase the combustion rate
Increase the gas production rate
Minimise the chances of clinker formation
✅ The correct answer is option D.
3275. A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
Presence of large quantity of hydrogen in the fuel
Low calorific value of the fuel
High sulphur content in the fuel
Lack of thorough mixing of fuel with air
✅ The correct answer is option D.
3276. Fireclay bricks are never used in the
beehive oven
coke oven walls
zinc roaster
lead blast furnace
✅ The correct answer is option B.
3277. Ramming masses are used for
obtaining monolithic working faces.
repairing construction of various furnace parts.
both (a) & (b).
neither (a) nor (b).
✅ The correct answer is option C.
3278. High porosity refractory bricks have
poor resistance to the peneration of molten slag, metal & flue gases.
poor heat conductivity & low strength.
better thermal spalling resistance.
all (a), (b) and (c).
✅ The correct answer is option D.
3279. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
segar cones.
muffles for muffle furnaces.
insulating bricks.
crucibles used for melting of high purity metals.
✅ The correct answer is option D.
3280. A fuel with high heat release rate will
Require smaller combustion chamber
Have high calorific value
Have high adiabatic flame temperature
None of these
✅ The correct answer is option A.