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

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

A

20

B

40

C

60

D

80

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

A

1800

B

2200

C

2400

D

2700

Coke oven gas is a better fuel than blast furnace gas, because of its higher

A

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

B

Adiabatic flame temperature

C

Heat release rate (thus requiring smaller combustion chamber)

D

All of the above

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

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

Here are some words translated from an artificial language : 'Agnoscrenia' means poisonous Spider, 'Delanocrenia' means Poisonous Snake, 'Agnosdeery' means Brown Spider. Which of the following word could possible mean 'Black Widow Spider'?

A

Agnosvitriblunin

B

Delanoclostagnos

C

Agnosdelano

D

Delamuttiagnos

Blast furnace gas burns with a bluish flame, because of the presence of

A

CO

B

CH₄

C

CO₂

D

S

Increase in ash content of blast furnace coke

A

Reduces its consumption in the furnace

B

Increases its consumption in the furnace

C

Does not affect its consumption in the furnace

D

Decreases its hardness and abrasion resistance

Blast furnace gas compared to coke oven gas has

A

Lower ignition temperature

B

Narrower limit of inflammability

C

Higher calorific value

D

Lower theoretical flame temperature

Coke oven gas compared to blast furnace gas is

A

More explosive and inflammable

B

Less poisonous

C

Lighter

D

All of the above

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

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