A. Thermal cracking
B. Gum formation
C. Coking
D. Discoloration
Related Mcqs:
- Road grade bitumen is produced from vacuum residue by its ____________________?
A. Aeration
B. Pyrolysis
C. Hydrogenation
D. Steam reforming - The proper arrangement of the petroleum fractions in order of their boiling points is __________________ ?
A. Lubricating oil > diesel > petrol > LPG
B. Lubricating oil > petrol > diesel > LPG
C. Petrol > lubricating oil > diesel > LPG
D. Petrol > diesel > LPG > lubricating oil - 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 - The most suitable solvent for deasphalting vacuum residue is_____________________?
A. Propane
B. Methyl ethyl ketone
C. Doctor’s solution
D. Methanol amine - Flash point of atmospheric distillation residue is determined by ______________ apparatus?
A. Pensky-Martens (closed cup type)
B. Abel
C. Cleveland (open cup type)
D. None of these - 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 tower of the crude distillation plant is about _______________ mm Hg (absolute)?
A. 5-10
B. 30-80
C. 150-250
D. 350-400 - 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 - Removal of light fractions from crude oil is called its _____________________?
A. Sweetening
B. Dehydration
C. Stabilisation
D. Visbreaking - Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ?
A. Diesel
B. Gasoline
C. Atmospheric gas oil
D. Vacuum gas oil
