A. Conduction
B. Natural convection
C. Radiation of heat from the roof of the combustion chamber
D. None of these
Related Mcqs:
- Reverberatory furnace is used for_____________________?
A. Roasting/reduction of ores
B. Annealing steel coil
C. Heating air
D. Steel melting - In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
A. Rate of firing and emissivity of flame
B. Thermal conductivity of the charge & structural materials of furnace
C. Nature of process; whether batch, continuous or intermittent
D. All A., B. and C. - 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 - In salt bath furnace, heat is transferred to the charge mainly by __________________?
A. Conduction
B. Convection
C. Radiation
D. None of these - 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 - An example of indirectly heated furnace is the_________________?
A. Soaking pit
B. Muffle furnace
C. Reheating furnace
D. None of these - Example of an indirectly heated furnace is__________________?
A. Hood annealing furnace
B. Muffle furnace
C. Both A. and B.
D. Neither A. nor B. - ______________ is an indirectly heated furnace?
A. Open hearth furnace
B. Muffle furnace
C. Soaking pit
D. Reheating furnace - The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________?
A. Oxidation/scaling
B. Decarburising
C. Sulphur penetration
D. Either of the above - Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
A. Emissivity of the refractory walls
B. Size of the furnace
C. Use of waste heat recovery equipments
D. Thickness of the stock
