5
20
50
80
✅ The correct answer is option B.
Furnace Technology MCQs
Maximum thermal efficiency of boiler may be about __________ percent.
10
25
65
90
✅ The correct answer is option D.
Which of the following is not a recuperative furnace?
Soaking pit
Reheating furnace
Steamboiler
Coke oven
✅ The correct answer is option D.
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
5
60
20
40
✅ The correct answer is option C.
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.
Which of the following is a periodic furnace?
Tunnel kiln
Rotary kiln
Soaking pit
Reheating furnace
✅ The correct answer is option C.
In a furnace employing forced draught as compared to induced draught,
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
The fan operates hot and hence blades are liable to corrosion and erosion
Positive pressure exists in the furnace
None of these
✅ The correct answer is option C.
Furnace pressure is normally controlled by regulating the
Air pressure
Fuel gas pressure
Speed of I.fan
Damper
✅ The correct answer is option D.
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Low emissivity
High thermal conductivity
Both A and B
Neither A nor B
✅ The correct answer is option C.
Soaking pits are meant for heating steel
Ingots
Coils
Sheets
Slabs
✅ The correct answer is option A.