The catalytic cracking of heavier petroleum fraction is done to produce mainly____________________?

Related Mcqs:

1. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil__________________?

   A. Gives higher yield of petrol
   B. Lower octane number of petrol
   C. Higher sulphur content in the product
   D. Higher gum forming material in petrol

2. In catalytic cracking process, olefins crack ______________ times faster than in thermal cracking process?

   A. 100
   B. 200-300
   C. 1000-10000
   D. 10

3. In the atmospheric pressure crude distillation, the content of _____________ from lighter fraction to heavier ones?

   A. Sulphur increases
   B. Sulphur decreases
   C. Nitrogen decreases
   D. None of these

4. Sulphur content in lighter and heavier petroleum products is generally determined respectively by _______________?

   A. Lamp method and bomb method
   B. Bomb method and lamp method
   C. Bomb method and quartz tube method
   D. Quartz tube method and lamp method

5. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to__________________?

   A. Increase the yield of light distillates
   B. Suppress coke formation
   C. Enhance the octane number of gasoline
   D. Reduce gum content in gasoline

6. Pressure & temperature maintained in catalytic cracking is about__________________?

   A. 2 atm & 500°C
   B. 10 atm & 500°C
   C. 30 atm & 200°C
   D. 50 atm & 750°C

7. In catalytic cracking, the___________________?

   A. Gasoline obtained has a very low octane number
   B. Pressure & temperature is very high
   C. Gasoline obtained has very high aromatic content
   D. Gasoline obtained has very high amount of gum forming compounds

8. Pick out the correct statement pertaining to catalytic cracking ?

   A. With increase in the reactor pressure, octane number of gasoline decreases
   B. With increase in the reactor temperature, gasoline yield decreases for a given conversion
   C. Percentage conversion increases with increase in the catalyst to oil ratio
   D. All A., B. and C.

9. Octane number of gasoline produced by two stage fluidised catalytic cracking process is___________________?

   A. 80
   B. 87
   C. 92
   D. 97

10. Which of the following is used as a catalyst in fluidised bed catalytic cracking ?

    A. Silica-magnesia
    B. Silica-alumina
    C. Bentonite clays
    D. All A., B. and C.