Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A

Increases the reducing potential of the gas

B

Increases the flame temperature

C

No significant change occurs

D

Increases the hydrogen content in the metal

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

A

20

B

40

C

60

D

80

Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about

A

0.1

B

1

C

2.5

D

3.5

The main charge in blast furnace is usually

A

Iron ore & coke

B

Iron ore, coke & air

C

Limestone, coke & iron ore

D

Limestone, sand & iron ore

Operation of blast furnace stove is based on the principles of a __________ furnace.

A

Regenerative

B

Recuperative

C

Both A and B

D

Neither A nor B

The charge is fed into the blast furnace through the

A

Stack

B

Throat

C

Bosh

D

Tyres

The charge of the blast furnace consists of

A

Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

B

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

C

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

D

Calcined ore, coke and limestone all in equal parts

The coke in the charge of blast furnace

A

Controls the grade of pig iron

B

Acts as an iron bearing mineral

C

Supplies heat to reduce ore and melt the iron

D

Forms a slag by combining with impurities

A, B and C enter into a partnership. A contributes one-third of the capital while B contributes as much as A and C together contribute. If the profit at the end of the year amounts to Tk. 900, What would C receive?

A

Tk. 200

B

Tk. 150

C

Tk. 100

D

Tk. 300

Which is the main reducing agent during production of iron from iron ore in a blast furnace?

A

C

B

CO

C

CO₂

D

H₂

Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?

Related Questions