A. Coking
B. Visbreaking
C. Pyrolysis
D. None of these
Related Mcqs:
- 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 - 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 - In catalytic cracking process, olefins crack ______________ times faster than in thermal cracking process?
A. 100
B. 200-300
C. 1000-10000
D. 10 - Which of the following is the most widely used cracking process in oil refineries ?
A. Dubbs process
B. T.C.C. moving bed process
C. Fluidised bed catalytic cracking process
D. Houdry’s fixed bed process - Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?
A. 1 to 5
B. 30 to 80
C. 250 to 350
D. 450 to 500 - ____________ is not an important refinery process for upgrading the quality of lubricating oil ?
A. Deoiling
B. Solvent refining
C. Clay treatment
D. Hydro-treatment - Which of the following is not an important property of fuel oil/furnace oil ?
A. Sulphur content
B. Viscosity
C. Aniline point
D. Flash point - 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. - Most commonly used crude heater before the fractionation tower in a refinery is the ______________ heater?
A. Electric immersion
B. Pipestill
C. Steam coil
D. None of these - Water content in the crude oil as it comes out of oil well may be upto ______________ percent?
A. 2
B. 5
C. 10
D. 25
