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Furnace Technology

Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________?

Furnace Technology /
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________?

A. Graphite powder
B. Thoria
C. Zircon powder
D. Beryllium

Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________? Read More »

Furnace Technology

Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________?

Furnace Technology /
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

Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________? Read More »

Furnace Technology

The amount of combustible escaping unconsumed from the furnace, depends upon the________________?

Furnace Technology /
The amount of combustible escag unconsumed from the furnace, depends upon the________________?

A. Air supplied and furnace temperature
B. Burner design (thoroughness of mixing versus stratification)
C. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by
change of direction)
D. All A., B. and C.

The amount of combustible escaping unconsumed from the furnace, depends upon the________________? Read More »

Furnace Technology

Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?

Furnace Technology /
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

Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________? Read More »

Furnace Technology

Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?

Furnace Technology /
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?

A. 10-15
B. 25-30
C. 45-50
D. 65-70

Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent? Read More »

Furnace Technology