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.Management Sciences
Category: Furnace Technology
The resistance furnace produces heat by the__________________?
A. Electric arc struck between electrodes and the charge
B. Flow of current through a heating element
C. Combination of induced current and skin effect
D. None of these
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?
A. Sidefired
B. Underfired
C. Covered
D. Recirculating
Which is the most thermally efficient furnace _______________________?
A. Reheating furnace
B. Reverberatory furnace
C. Rotary kilns
D. Boiler furnace
Which of the following is not a recuperative furnace ?
A. Soaking pit
B. Reheating furnace
C. Steam boiler
D. Coke oven
Which furnace employs preheating, heating and soaking zones ?
A. Soaking pit
B. Reheating furnace
C. Open hearth furnace
D. Cupola
In a furnace operation, which is not preheated ?
A. Solid fuels
B. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
C. Both A. and B.
D. Neither A. nor B.
In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
A. More of excess air
B. Less of excess air
C. More of CO in flue gas
D. More of CO2 in flue gas
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
A. Accelerating the rate of scaling
B. Causing metal embrittlement
C. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at
high temperature
D. All A., B. and C.
Which is a continuous furnace ?
A. Coke ovens
B. Annealing furnace
C. Glass tank furnace
D. None of these
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