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.Management Sciences
Category: Petroleum Refinery Engineering
Choose the correct statement regarding thermal cracking ?
A. Moderate changes in operating temperature does not change the depth of cracking
B. Increased residence time results in the decreased severity of cracking
C. At low pressure, the yield of lighter hydrocarbons are more
D. Greater depth of cracking gives lower octane number gasoline
Testing of the knocking characteristics of petrofuels is done in a _________________ engine ?
A. Carnot
B. CFR (Co-operative fuel research)
C. Stirling
D. Diesel
Aniline point test of an oil qualitatively indicates the ______________ content of an oil?
A. Paraffin
B. Olefin
C. Aromatic
D. Naphthene
LPG when brought to atmospheric pressure & temperature will be a________________?
A. Liquid lighter than water
B. Liquid heavier than water
C. Gas lighter than air
D. Gas heavier than air
The best method of determining sulphur in crude oil is by the _______________ method?
A. Kjeldahl
B. Dumas
C. Bomb calorimeter
D. Junkers calorimeter
The conductivity of crude oil-water mixture depends on the__________________?
A. pH value
B. Water percentage
C. Temperature
D. All A., B. and C.
Operating condition in the electrical dehydrators for crude oil is about____________________?
A. 6.5 kgf/Cm2 & 95°C
B. 1 atm. & 110 °C
C. 20 kgf/cm2 & 110°C
D. 50 atm. and 150°C
Aromatics are desired constituents of____________________?
A. Lubricating oil
B. Diesel
C. Kerosene
D. Petrol
____________ is not an important refinery process for upgrading the quality of lubricating oil ?
A. Deoiling
B. Solvent refining
C. Clay treatment
D. Hydro-treatment
Isomerisation converts the ___________________ tot-paraffins?
A. Paraffins
B. Olefins
C. Naphthenes
D. None of these
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