Dust content in raw blast furnace gas is about __________ gm/Nm3, hence it is cleaned to the dust level of about 3 before use.

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

A

[

A.

B. >71%

B

In between 37 & 71%

C

None of these

In the blast furnace, as the oxygen percentage in air blast increases, the
P. flame temperature increases
Q. blast volume increases
R. blast volume decreases
S. flame temperature decreases

A

P, Q

B

P, R

C

R, S

D

Q, S

Temperature of blast furnace gas emanating from blast furnace is about . . . . . . . . degree C

A

80 - 100

B

200 - 250

C

350 - 500

D

650 - 750

Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?

A

Packed scrubber

B

Gravity settling chamber

C

Electrostatic precipitator

D

Hydrocyclone

In an ideal blast furnace, the input and output are as follows:
Input:
Ore, Pure Fe₂O₃, no gaunge : 1357kg/THM^∗
Coke, Pure C, no ash : 400 kg/THM
Blast air, dry : O₂ : 293 kg/HTM, N₂ : 964 KG/THM
Flux : nil
Output :
Hot metal : 5wt% C, rest iron
Slag : nil
Top gas : CO, CO₂, N₂
∗ THM refers ton of hot metal (liquid pig iron) ; Atomic weights: C-12, O-16, Fe-56 The amount of oxygen in CO & CO₂ leaving with the top gas is . . . . . . . . kg.

A

293

B

407

C

700

D

1050

Grey pig is produced when the blast furnace is not provided with sufficient fuel while the white pig is produced when the blast furnace is provided sufficiently with fuel.

A

True

B

False

Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

A

H₂O

B

CO₂

C

CO

D

CH₄

The price of raw materials has gone up by 15%, labor cost has also increased from 25% of the cost of raw material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?

A

28%

B

17%

C

27%

D

24%

E

Cannot determined

Statement : One of the problems facing the food processing industry is the irregular supply of raw material. The producers of raw material are not getting a reasonable price.

Courses of Action :
I. The government should regulate the supply of raw material to other industries also.
II. The government should announce an attractive package to ensure regular supply of raw material for food processing industry.

A

Only I follows

B

Only II follows

C

Either I or II follows

D

Neither I nor II follows

E

Both I and II follow

Alkali metal oxide content in the blast furnace raw material

A

increases the strength of coke

B

increases the reactivity of coke

C

decreases the reactivity of coke

D

neither affects the strength nor the reactivity of coke

Dust content in raw blast furnace gas is about __________ gm/Nm³, hence it is cleaned to the dust level of about 3 before use.

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