Related Questions

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
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
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
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
Sour crude means the __________ bearing crude.
A Asphalt
B Sulphur compounds
C Wax
D Nitrogen compounds
Crude oils containing more than __________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a 'salty crude'.
A 1
B 5
C 15
D 25
__________ base crude oil is also called asphaltic crude.
A Paraffinic
B Naphthenic
C Mixed
D Aromatic
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
A 80-170
B 200-300
C 250-270
D 280-300
__________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation.
A Magnesium
B Potassium
C Calcium
D Sodium

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