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.Management Sciences
Category: Furnace Technology
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
Means for giving direction to the circulation of gases in furnaces are_____________________?
A. Fans
B. Arrangement of heating stock in the furnaces
C. Location of outlet ports and heating & combustion devices
D. All A., B. and C.
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
Very high pressure boilers are usually _____________ boilers?
A. Fire tube
B. Water tube
C. Waste heat
D. Natural circulation
Hearth furnaces are not used for____________________?
A. Roasting
B. Melting
C. Reheating
D. None of these
In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?
A. Use of non-preheated combustion air
B. Use of pulverised solid fuels
C. Imperfect mixing of fuel & air and infiltration of air
D. Use of excessive positive draft in the furnace
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.
Ceramic recuperators compared to metallic recuperators for the same duty_________________?
A. Are lighter
B. Occupy more space
C. Are less costly
D. Have higher pressure differential between flue gas & air side
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