Ton stock/hr/m² hearth area
Ton stock/hr
Ton stock/m² hearth area
Both B and C
✅ The correct answer is option A.
Furnace Technology MCQs
Very high pressure boilers are usually __________ boilers.
Fire tube
Water tube
Waste heat
Natural circulation
✅ The correct answer is option D.
Turndown ratio of a burner gives an idea of the __________ in the furnace.
Range of fuel firing rates
Volume of the combustion chamber
Maximum heat input rate only
Minimum heat input rate only
✅ The correct answer is option A.
Which of the following is not a directly fired furnace?
By-product coke oven
Calcination kiln
Sintering furnace
Open hearth furnace
✅ The correct answer is option A.
Which furnace employs preheating, heating and soaking zones?
Soaking pit
Reheating furnace
Open hearth furnace
Cupola
✅ The correct answer is option B.
Which is not a hearth furnace?
Glass tank furnace
Open hearth furnace
Cupola
Reheating furnace
✅ The correct answer is option C.
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
Low reactivity of carbonised residue containing high proportion of iron & sulphur
Low forced draft & fuel bed temperature
Thick firebed and preheated primary air
All of the above
✅ The correct answer is option D.
Presence of SO₂ in furnace gases attacks the ferrous metal by way of
Accelerating the rate of scaling
Causing metal embrittlement
Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
All of the above
✅ The correct answer is option D.
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the
Rate of firing and emissivity of flame
Thermal conductivity of the charge & structural materials of furnace
Nature of process ; whether batch, continuous or intermittant
All of the above
✅ The correct answer is option D.
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
Conduction
Convection
Radiation
Can not be predicted
✅ The correct answer is option C.