Hearth furnaces are not used for____________________?
Hearth furnaces are not used for____________________?
A. Roasting
B. Melting
C. Reheating
D. None of these
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The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?A. Arc
B. Resistance
C. Low frequency induction
D. High frequency inductionHeat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
Question: 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. Answer: Option C
Explanation:
No answer description available for this question.
__________ atmosphere is maintained inside an iron blast furnace.
Question: __________ atmosphere is maintained inside an iron blast furnace.
[A].Oxidising [B].
Reducing [C].
Inert [D].
Decarburising Answer: Option B
Explanation:
No answer description available for this question.
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?A. Accelerating the rate of scaling
B. Causing metal embrittlement
C. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at
high temperature
D. All A., B. and C.Circulation of gases in furnace is caused by the
Question: Circulation of gases in furnace is caused by the
[A].change in volume during a change of temperature. [B].
difference in density between hot and cold gases. [C].
furnace pressure in conjunction with draft in flues. [D].
all (a), (b) and (c). Answer: Option D
Explanation:
No answer description available for this question.
In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
In order to maintain an oxidising atmosphere in a furnace, it should have__________________?A. More of excess air
B. Less of excess air
C. More of CO in flue gas
D. More of CO2 in flue gas