2401. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
Economiser
Steam superheater
Air preheater
All of the above
✅ The correct answer is option D.
Chemical Engineering
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2402. Reverberatory furnace is used for
Roasting/reduction of ores
Annealing steel coil
Heating air
Steel melting
✅ The correct answer is option A.
2403. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
Ostwald chart
Cox chart
Sankey diagram
None of these
✅ The correct answer is option C.
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.
2405. The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Air supplied and furnace temperature
Burner design (thoroughness of mixing versus stratification)
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
All of the above
✅ The correct answer is option D.
2406. Fuel used in B.F. stove is
Pulverised coal
Furnace oil
Blast furnace gas/mixed gas
Coke oven gas
✅ The correct answer is option C.
2407. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
350
750
1050
1250
✅ The correct answer is option B.
2408. Which of the following variables affects the furnace capacity?
Temperature of flue gas
Thermal conductivity of stock
Thickness of heating stock
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.
2410. Which of the following is a rotary furnace?
Lime kiln
Soaking pit
Stoves
Annealing furnace
✅ The correct answer is option A.