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
Related Mcqs:
- Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about _______________ mm Hg (absolute)?
A. 5-10
B. 30-80
C. 150-250
D. 350-400 - In catalytic cracking process, olefins crack ______________ times faster than in thermal cracking process?
A. 100
B. 200-300
C. 1000-10000
D. 10 - The vacuum maintained in vacuum distillation unit for reduced crude is about _______________ mm Hg?
A. 1.2
B. 12
C. 120
D. 700 - 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 - The terminology used for the bottom most product from the vacuum crude distillation unit is______________?
A. Residual crude
B. Residuum
C. Reduced crude
D. Petrolatum - Crude oil is subjected to vacuum distillation in the last stage, because_________________?
A. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may
decompose
B. Lighter/low boiling products are prone to thermal decomposition
C. High purity products can be obtained thereby
D. None of these - Paraffin base crude oil as compared to asphalt base crude gives___________________?
A. Higher yield of straight run gasoline
B. Higher octane number gasoline
C. Lower viscosity index lube oil
D. Poorer yield of lube oil - 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 - Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of ____________________?
A. Thermal cracking
B. Gum formation
C. Coking
D. Discoloration - The most suitable solvent for deasphalting vacuum residue is_____________________?
A. Propane
B. Methyl ethyl ketone
C. Doctor’s solution
D. Methanol amine
