High amount of sulphur and phosphorous in coke causes ____________________ ?

Related Mcqs:

1. A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?

   A. Presence of large quantity of hydrogen in the fuel
   B. Low calorific value of the fuel
   C. High sulphur content in the fuel
   D. Lack of thorough mixing of fuel with air

2. Which adsorbent is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ?

   A. Silica gel
   B. Diatomaceous earth
   C. Basalt
   D. Bog iron (i.e., moist ferric hydroxide)

3. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?

   A. Iron blast furnace
   B. Cupola in foundries
   C. Sinter making
   D. Domestic ovens

4. Narrow coke ovens as compared to wider coke ovens_________________?

   A. Produce smaller coke
   B. Produce stronger coke
   C. Require less time of carbonisation
   D. All A., B. and C.

5. 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

6. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?

   A. Less reactive
   B. Stronger
   C. Smaller in size
   D. All A., B. & C.

7. Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?

   A. Colour
   B. Moisture content
   C. Ash content
   D. Volatile matter

8. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?

   A. Density
   B. Porosity
   C. Electrical resistivity
   D. None of these

9. High sulphur content in a fuel ______________ of the flue gases?

   A. Decreases the dew point
   B. Increases the dew point
   C. Reduces the combustion efficiency by limiting the permissible temperature reduction
   D. Both B. and C.

10. Undercharging of coal in the by-product coke ovens results in ____________________?

    A. Decrease in the c.v. of coke oven gas
    B. Increase in its throughput
    C. Increase in the c.v. of coke oven gas
    D. No change in the c.v. of coke oven gas