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.Management Sciences
Category: Furnace Technology
In a furnace employing forced draught as compared to induced draught______________________?
A. Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
B. The fan operates hot and hence blades are liable to corrosion and erosion
C. Positive pressure exists in the furnace
D. None of these
Which of the following accentuates clinkering troubles on furnace grate burning coal ?
A. Low reactivity of carbonised residue containing high proportion of iron & sulphur
B. Low forced draft & fuel bed temperature
C. Thick firebed and preheated primary air
D. All A., B. and C.
Heat balance of furnace provides means of determining the_________________?
A. Thermal efficiency of the process
B. Sources of heat losses
C. Scope of reduction of heat losses
D. All A., B. and C.
Main gas valve in a gaseous fuel burner is a ______________ valve?
A. Gate
B. Butterfly
C. Globe
D. None of these
The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________?
A. Oxidation/scaling
B. Decarburising
C. Sulphur penetration
D. Either of the above
Maximum heat transfer in high temperature furnaces is by____________________?
A. Conduction
B. Convection
C. Radiation
D. Either A., B. or C.; depends on the type of furnace
Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?
A. 50
B. 100
C. 150
D. 250
Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
A. Ammonia
B. Fine dolomite
C. Alkaline powders
D. None of these
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
A. Increase in calorific value of the fuel
B. Increase in flame temperature
C. Reduction in scale losses
D. Saving in fuel consumption
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