CHEMICAL ENGINEERING

Question: 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).

Answer: Option D

Explanation:

No answer description available for this question.

Question: In order to maintain a reducing atmosphere in a furnace, it should have
[A].

no O2 in flue gas

[B].

CO in flue gas

[C].

high excess air

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
[A].

Ostwald chart

[B].

Cox chart

[C].

Sankey diagram

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Heat balance of furnace provides means of determining the
[A].

thermal efficiency of the process.

[B].

sources of heat losses.

[C].

scope of reduction of heat losses.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the
[A].

rate of firing and emissivity of flame.

[B].

thermal conductivity of the charge & structural materials of furnace.

[C].

nature of process ; whether batch, continuous or intermittant.

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

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.

Question: 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 these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fuel used in B.F. stove is
[A].

pulverised coal

[B].

furnace oil

[C].

blast furnace gas/mixed gas

[D].

coke oven gas

Answer: Option C

Explanation:

No answer description available for this question.

Question: Blast furnace stoves are meant for heating
[A].

air

[B].

blast furnace gas

[C].

steam

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.