Thermal efficiency of an open hearth furnace may be about _____________ percent?
Thermal efficiency of an open hearth furnace may be about _____________ percent?
A. 5
B. 20
C. 50
D. 80
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Thermal efficiency of furnaces can be improved by____________________?
Thermal efficiency of furnaces can be improved by____________________?A. Waste heat recovery from flue gas
B. Minimising heat losses from furnace walls
C. Maintaining proper draught
D. All A., B. and C.Maximum thermal efficiency of boiler may be about _____________ percent?
Maximum thermal efficiency of boiler may be about _____________ percent?A. 10
B. 25
C. 65
D. 90Reducing atmosphere is maintained in a__________________?
Reducing atmosphere is maintained in a__________________?A. Calcination kiln
B. Blast furnace
C. Soaking pit
D. L.D. converterAcid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?A. 80
B. 130
C. 180
D. 250The heating capacity of muffle furnace depends on the____________________?
The heating capacity of muffle furnace depends on the____________________?A. Surface area & emissivity of the stock
B. Properties of the muffle wall (temperature, area, and emissivity)
C. Both A. & B.
D. Neither A. nor B.Reverberatory furnace is used for_____________________?
Reverberatory furnace is used for_____________________?A. Roasting/reduction of ores
B. Annealing steel coil
C. Heating air
D. Steel melting