2378. Combustion of fuel in a furnace with oxygen enriched air results in higher
Flue gas volume
Flame temperature
Fuel consumption
Stack loss
✅ The correct answer is option B.
2383. Fuel economy in an industrial furnace operation can not be achieved by the use of
Stoichiometric combustion air
Non-preheated combustion air
Combustion air not enriched with oxygen
Recupterators
✅ The correct answer is option A.
2388. Protective gas used in the annealing furnace for steel coil comprises of
95% N₂ + 5% H₂
5% H₂ + 9% N₂
100% CO
100 %H₂
✅ The correct answer is option A.
2393. The heating capacity of continuous reheating furnace depends upon the
Hearth area and furnace temperature
Emissivity of the stock
Ratio of wall surface to stock surface
All of the above
✅ The correct answer is option D.
2394. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Reduces the flue gas temperature and makes the furnace atmosphere oxidising
Increases the load on the induced draft fan
Reduces the furnace draught
All of the above
✅ The correct answer is option D.
2399. Size of the combustion chamber of a furnace depends upon the
Heat release rate of the fuel
Preheat temperature of fuel & air
Method of mixing the fuel & air
All of the above
✅ The correct answer is option D.
2404. Decarburisation of steel
Is the removal of carbon from iron carbide (Fe₃C)
Affects its crystalline structure
Is favoured by CO₂
All of the above
✅ The correct answer is option D.
2409. __________ atmosphere is maintained inside an iron blast furnace.
Oxidising
Reducing
Inert
Decarburising
✅ The correct answer is option B.
2414. Large tonnage of refractory bricks are dried in a
Shaft furnace
Rotary hearth furnace
Tunnel kiln
Muffle furnace
✅ The correct answer is option C.
2380. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
Sidefired
Underfired
Covered
Recirculating
✅ The correct answer is option B.