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

Related Mcqs:

1. 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

2. 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

3. 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

4. Ammonia content in raw coke oven gas is about _____________ gm/Nm3?

   A. 1
   B. 5
   C. 50
   D. 100

5. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?

   A. 71%
   C. In between 37 & 71%
   D. None of these

6. 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

7. 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

8. 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 A., B. and C.

9. Coke oven gas compared to blast furnace gas is________________?

   A. More explosive and inflammable
   B. Less poisonous
   C. Lighter
   D. All A., B. and C.

10. Percentage of methane in coke oven gas may be around _____________________?

    A. 5
    B. 15
    C. 25
    D. 50