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.Management Sciences
Category: Furnace Technology
______________ is an indirectly heated furnace?
A. Open hearth furnace
B. Muffle furnace
C. Soaking pit
D. Reheating furnace
Power required in case of forced draught as compared to induced draught (for the same draught produced) is___________________?
A. Same
B. Less
C. More
D. Either more or less; depends on the flue gas density
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
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
Which of the following variables does not affect the furnace capacity ?
A. Size of the furnace
B. Gas velocity in furnace
C. Ratio of wall surface to surface of stock
D. None of these
Forced recirculation of furnace gases is practised_______________?
A. To increase heat transfer by convection
B. To ensure uniform temperature
C. In furnaces, operating below 750°C
D. All A., B. and C.
Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?
A. Increasing the draft in the furnace
B. Preheating the fuel gas
C. Oxygen enrichment of combustion air
D. Preheating the combustion air
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.
Turndown ratio of a burner gives an idea of the ______________ in the furnace?
A. Range of fuel firing rates
B. Volume of the combustion chamber
C. Maximum heat input rate only
D. Minimum heat input rate only
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