Conduction
Convection
Radiation
None of these
✅ The correct answer is option A.
Engineering
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2382. In order to maintain a reducing atmosphere in a furnace, it should have
No O₂ in flue gas
CO in flue gas
High excess air
None of these
✅ 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.
2384. Calcination of limestone to produce lime is done in a __________ kiln.
Tunnel
Rotary
Vertical shaft
Both B and C
✅ The correct answer is option D.
2385. Which of the following is the most suitable for preheating combustion air above 650°C ?
Regenerator
Metallic recuperator
Ceramic recuperator
None of these
✅ The correct answer is option C.
2386. Which is the most thermally efficient furnace?
Reheating furnace
Reverberatory furnace
Rotary kilns
Boiler furnace
✅ The correct answer is option D.
2387. Advantages of use of preheated combustion air are
Saving in fuel consumption
Reduction in scale losses
Increase in flame temperature
All of the above
✅ The correct answer is option D.
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.
2389. Oxygen enrichment of combustion air does not result in increase of the
Flame temperature
Oxygen in the flue gas
Stack loss
Heat transfer rate in the furnace
✅ The correct answer is option B.
2390. In producer gas making furnace, steam is added along with air to mainly control the
Fusion of coal ash & clinker formation
V. of producer gas
Temperature of producer gas
Tar content in producer gas
✅ The correct answer is option A.