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.Management Sciences
Category: Furnace Technology
Which is not accomplished in an underfired furnace ?
A. Increase in heating capacity/m2 of floor space
B. Elimination of cold spot at the bottom of the charge
C. Reduction in the temperature of furnace gases
D. Protection of the periphery of the charge from excessive radiation
The function of an economiser in a boiler is to preheat the _____________________?
A. Feedwater
B. Combustion air
C. Pulverised coal
D. Furnace oil
In reverberatory furnace, charge is heated mainly by__________________?
A. Conduction
B. Natural convection
C. Radiation of heat from the roof of the combustion chamber
D. None of these
Reverberatory furnace is used for_____________________?
A. Roasting/reduction of ores
B. Annealing steel coil
C. Heating air
D. Steel melting
Which of the following is a directly fired intermittent furnace ?
A. Walking beam reheating furnace
B. Reverberatory furnace
C. Tower furnace
D. Tunnel kiln
Reducing atmosphere is maintained in a__________________?
A. Calcination kiln
B. Blast furnace
C. Soaking pit
D. L.D. converter
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?
A. Preheating the combustion air
B. Oxygen enrichment of combustion air
C. Preheating the fuel gas
D. All A., B. & C.
The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
A. Arc
B. Resistance
C. Low frequency induction
D. High frequency induction
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