A. Oxidation/scaling
B. Decarburising
C. Sulphur penetration
D. Either of the above
Related Mcqs:
- Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
A. 5
B. 60
C. 20
D. 40 - 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 - Neutral atmosphere is maintained in a/an ____________ furnace?
A. Cold rolled steel coil annealing
B. Open hearth
C. Soaking pit
D. Walking beam reheating - 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 - _____________ atmosphere is maintained inside an iron blast furnace?
A. Oxidising
B. Reducing
C. Inert
D. Decarburising - An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?
A. Walking beam
B. Shaft
C. Tunnel
D. Rotary hearth - Furnace aerodynamics is related to the _____________ in the furnace?
A. Movement of gases
B. Measurement of flue gas volume
C. Temperature control
D. Pressure adjustment - 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 - Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?
A. Coke oven
B. Blast furnace stoves
C. Beehive coke oven
D. High pressure boiler - An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
A. Resistance
B. Arc
C. Low frequency induction
D. None of these
