2396. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
80
130
180
250
✅ The correct answer is option B.
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.
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.
2411. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
20
40
65
80
✅ The correct answer is option B.
2376. Overfire burning in a furnace is a phenomenon characterised by
Supply of excess fuel
Supply of excess air
Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
None of these
✅ The correct answer is option C.
2381. In salt bath furnace, heat is transferred to the charge mainly by
Conduction
Convection
Radiation
None of these
✅ The correct answer is option A.
2386. Which is the most thermally efficient furnace?
Reheating furnace
Reverberatory furnace
Rotary kilns
Boiler furnace
✅ The correct answer is option D.
2391. Main gas valve in a gaseous fuel burner is a __________ valve.
Gate
Butterfly
Globe
None of these
✅ The correct answer is option A.
2397. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Preheating the combustion air
Oxygen enrichment of combustion air
Preheating the fuel gas
All of the above
✅ The correct answer is option D.
2402. Reverberatory furnace is used for
Roasting/reduction of ores
Annealing steel coil
Heating air
Steel melting
✅ The correct answer is option A.