Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

Traces of tar fog present in the coke oven gas is removed by

A

Cyclone separator

B

Wet packed scrubber

C

Electrostatic precipitator

D

Washing with monoethanolamine

Traces of liquid tar fog present in coke oven gas is separated using

A

Electrostatic precipitator

B

Cyclone separator

C

Strainer

D

None of these

Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

A

Hot scarfing of steel slabs

B

Mixing with blast furnace gas

C

Coke oven battery heating

D

Steel ladle drying

Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by

A

Adsorption on palladium

B

Cryogenic operations (low temperature cooling)

C

Absorption (using ethanolamine or pyragalloll solution)

D

None of these

Naphthalene recovered from coke oven gas is used

A

As moisture proof coating on fibres

B

As moth balls (insecticides)

C

As a fuel in furnaces

D

For making electrodes

Width of the coke oven towards coke side is slightly more than that on pusher side to

A

Facilitate easy discharging of coke as it swells during carbonisation

B

Facilitate uniform heating of the oven

C

Increase the output of the coke

D

None of these

Hydrogen content of coke oven gas is __________ percent.

A

4

B

22

C

58

D

84

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 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

Coke oven gas compared to blast furnace gas is

A

More explosive and inflammable

B

Less poisonous

C

Lighter

D

All of the above

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

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