Furnace Technology

A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
B. Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases
carburise the surface of steel at annealing temperatures
C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation
with increase in surface hardness
D. None of these

A. Computing the excess/deficiency of combustion air
B. Calculation of flue gas temperature
C. Computation of flue gas analysis
D. None of these

A. Soaking pits
B. Walking beam reheating furnace
C. Boiler furnace
D. Rotary kilns

A. Feedwater
B. Combustion air
C. Pulverised coal
D. Furnace oil

A. Ammonia
B. Fine dolomite
C. Alkaline powders
D. None of these

A. Furnace oil with air
B. Furnace oil with oxygen
C. Blast furnace gas with air
D. Blast furnace gas with oxygen

A. Stoichiometric combustion air
B. Non-preheated combustion air
C. Combustion air not enriched with oxygen
D. Recuperators

A. Soaking pit
B. Reheating furnace
C. Open hearth furnace
D. Cupola

A. Glass melting furnace
B. Open hearth furnace
C. By product coke ovens
D. All A., B. and C.

A. Supply of excess fuel
B. Supply of excess air
C. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying
more air
D. None of these