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

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

A

5

B

25

C

55

D

75

Ionisation potential applied across the electrodes of electrostatic tar precipitator is around

A

230 V AC

B

60 KV AC

C

230 V DC

D

60 KV DC

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

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

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

Ionisation potential employed in the industrial electrostatic precipitator is of the order of

A

30 to 70 kV DC

B

30 to 70 kV AC

C

230 V AC

D

230 V DC

The dust collection efficiency of electrostatic precipitator increases with increase in the

A

Gas flow rate

B

Electrode area

C

Both A & B

D

Neither A nor B

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

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