A. Electricity
B. Blast furnace gas/mixed gas
C. Coke oven gas
D. Both B. and C.
Related Mcqs:
- 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 - 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. - Overfire burning in a furnace is a phenomenon characterised by____________________?
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 - An example of indirectly heated furnace is the_________________?
A. Soaking pit
B. Muffle furnace
C. Reheating furnace
D. None of these - Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?
A. Low emissivity
B. High thermal conductivity
C. Both A. and B.
D. Neither A. nor B. - 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 - 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 - Protective gas used in the annealing furnace for steel coil comprises of__________________?
A. 95% N2 + 5% H2
B. 5% H2 + 9% N2
C. 100% CO
D. 100% H2 - The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?
A. 15
B. 40
C. 70
D. 85
