For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be

Which of the following facts is/are correct about the blast furnace in Iron metallurgy? Limestone is added to the blast furnace to reduce the iron oxide in the ore to iron. Coke is added to the blast furnace to physically separate iron from other impurities. Carbon dioxide reduces to carbon monoxide.

A

A and B

B

B and C

C

Only C

D

None

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

For efficient performance of a blast furnace, the extent of reduction of lustite should be

A

100% indirect reduction

B

100% direct reduction

C

50 - 60% indirect reduction

D

30 - 40% indirect reduction

The reduction of FeO with CO gas in co-current flow is given by the following equation:
FeO + CO = Fe + CO₂, ΔG° = 8120 J at 1173K The ratio of pco/pco₂ for this reaction at 1173K is

A

0

B

0.25

C

0.44

D

2.3

FeO(s) + CO(g) = Fe(s) + CO₂(g), k = 0.435 at 1173 E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?

A

1.0

B

1.3

C

2.3

D

3.3

FeO(s) + CO(g) = Fe(s) + CO₂(g); K = 0.435 at 1173 K. At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173K?

A

1

B

1.3

C

2.3

D

3.3

Match the column: Metal Common method of extraction (i) Aluminium (a) Electrolysis of oxide dissolved in molten Cryolite (ii) Iron (b) Roasting followed by reduction with coke (iii) Copper (c) Roasting of sulphide partially and reduction (iv) Zinc (d) Reduction of the oxide with CO and coke in blast furnace

A

(i) – (a), (ii) – (b), (iii) – (c), (iv) – (d)

B

(i) – (a), (ii) – (d), (iii) – (c), (iv) – (b)

C

(i) – (a), (ii) – (c), (iii) – (d), (iv) – (b)

D

(i) – (b), (ii) – (a), (iii) – (c), (iv) – (d)

Consider the following statements for an induction furnace: 1. High-frequency current is generally used for the furnace working. 2. There is less loss of alloying elements due to oxidation. 3. Pronounced stirring action of molten metal occurs inside the furnace. 4. Slag cover is essential for the efficient working of the furnace. Which of the above statements are correct?

A

1, 3 and 4 only

B

2, 3 and 4 only

C

1, 2 and 3 only

D

1, 2, 3 and 4

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

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

For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be

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