2251. Low stack loss indicates the
Use of sub-stoichiometric air for combustion
Efficient use of fuel
Inefficient use of fuel
Oxygen enrichment of combustion air
✅ The correct answer is option B.
Chemical Engineering
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2252. Regenerators are used for waste heat recovery in
By-product coke ovens
Beehive coke oven
Blast furnace stoves
Soaking pits
✅ The correct answer is option A.
2253. Heat transfer rate to the stock/charge in the furnace does not depend upon the
Emissivity of the refactory walls
Size of the furance
Use of waste heat recovery equipments
Thickness of the stock
✅ The correct answer is option C.
2254. Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
Blast furnace
Steam boiler
Salt bath furnace
Annealing furnace
✅ The correct answer is option C.
2255. The heat recoverable from flue gases of furnaces depends on the
Thermal efficiency of furnace
Quantity of flue gases
Flue gas temperature drop through the furnace
All of the above
✅ The correct answer is option D.
2256. Which is a continuous furnace?
Coke ovens
Annealing furnace
Glass tank furnace
None of these
✅ The correct answer is option C.
2257. In a muffle furnace, the muffle
Retards the heat transfer
Assists in temperature equalisation in the charge
Permits the use of controlled atmosphere for the protection of stock
All of the above
✅ The correct answer is option D.
2258. Which one is not an induced draught furnace?
Blast furnace stove
Sintering furnace
High pressure boiler
None of these
✅ The correct answer is option A.
2259. Maximum heat transfer in high temperature furnaces is by
Conduction
Convection
Radiation
Either A, B or C; depends on the type of furnace
✅ The correct answer is option C.
2260. The advantages of firing pulverised coal in the furnace lies in the fact that, it
Permits the use of high ash content coal
Permits the use of low fusion point ash coal
Accelerates the burning rate and economises on fuel consumption
All of the above
✅ The correct answer is option C.