A. Conduction
B. Convection
C. Radiation
D. Cannot be predicted
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 - Maximum heat transfer in high temperature furnaces is by____________________?
A. Conduction
B. Convection
C. Radiation
D. Either A., B. or C.; depends on the type of furnace - Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________?
A. Blast furnace
B. Steam boiler
C. Salt bath furnace
D. Annealing furnace - Which of the following furnaces will have maximum thermal efficiency ?
A. Soaking pits
B. Walking beam reheating furnace
C. Boiler furnace
D. Rotary kilns - Soaking pits are meant for heating steel_________________?
A. Ingots
B. Coils
C. Sheets
D. Slabs - Which furnace employs preheating, heating and soaking zones ?
A. Soaking pit
B. Reheating furnace
C. Open hearth furnace
D. Cupola - In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
A. Ostwald chart
B. Cox chart
C. Sankey diagram
D. None of these - Hearth furnaces are not used for____________________?
A. Roasting
B. Melting
C. Reheating
D. None of these - 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. - Fuel economy in furnaces can be achieved by_________________?
A. Using oxygen enriched combustion air
B. Preheating the combustion air
C. Reducing the heat loss through furnace openings & doors
D. All A., B. and C.
