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.
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.
2224. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
2000
3000
4500
6000
✅ The correct answer is option C.
2229. Maximum thermal efficiency of boiler may be about __________ percent.
10
25
65
90
✅ The correct answer is option D.
2233. In a furnace operation, which is not preheated?
Solid fuels
Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
Both A and B
Neither A nor B
✅ The correct answer is option C.
2237. Furnace pressure is normally controlled by regulating the
Air pressure
Fuel gas pressure
Speed of I.fan
Damper
✅ The correct answer is option D.
2241. In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
Recuperator
Regenerator
Waste heat boiler
None of these
✅ The correct answer is option B.
2248. In which of the following furnaces, the gases are sucked through the stock bed from below?
Soaking pit
Sintering machine
Beehive oven
None of these
✅ The correct answer is option B.
2250. Recuperator is
Not used for fuel gas preheating
An intermittant waste heat recovery equipment
A continuous waste heat recovery equipment
Heavier than regenerator meant for the same duty
✅ 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.