Maximum thermal efficiency of boiler may be about _____________ percent?
Maximum thermal efficiency of boiler may be about _____________ percent?
A. 10
B. 25
C. 65
D. 90
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Forced recirculation of furnace gases is practised
Question: 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). Answer: Option D
Explanation:
No answer description available for this question.
In reverberatory furnace, charge is heated mainly by__________________?
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 theseDecarburisation of steel__________________?
Decarburisation of steel__________________?A. Is the removal of carbon from iron carbide (Fe3C)
B. Affects its crystalline structure
C. Is favoured by CO2
D. All A., B. and C.Size of the combustion chamber of a furnace depends upon the ___________________?
Size of the combustion chamber of a furnace depends upon the ___________________?A. Heat release rate of the fuel
B. Preheat temperature of fuel & air
C. Method of mixing the fuel & air
D. All A., B. and C.Which is a continuous furnace ?
Which is a continuous furnace ?A. Coke ovens
B. Annealing furnace
C. Glass tank furnace
D. None of theseOverfire burning in a furnace is a phenomenon characterised by____________________?
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