21. Which is the most ideal feed stock for ‘coking’ process used for the manufacture of petroleum coke ?
Naphtha
Vacuum residue
Light gas oil
Diesel
✅ The correct answer is option B.
Petroleum Refinery Engineering MCQs
22. A fuel oil consists of 4 fractions A, B, C and D. Their molar compositions and vapour pressures are given below : The vapour pressure of the fuel oil will be __________ mm Hg.
736
727.5
512
767.8
✅ The correct answer is option A.
23. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
gives higher yield of petrol.
lower octane number of petrol.
higher sulphur content in the product.
higher gum forming material in petrol.
✅ The correct answer is option A.
24. H/C ratio (by weight) for the same number of carbon atoms is the highest in case of
aromatics
paraffins
olefins
naphthenes
✅ The correct answer is option D.
25. The general formula of naphthenes is
CnH2n + 2
CnH2n-6 (where, n ≥ 6)
CnHn-4
same as that for olefins i.e. CnH2n
✅ The correct answer is option D.
26. Smoke volatility index is equal to smoke point plus
0.42 x(% distilled at 204°C)
5 mm
0.84 x (% distilled at 204°C)
10 mm. approximately
✅ The correct answer is option A.
28. Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octance is chemically known as
α-methyl naphthalene.
2-2-4 tri methyl pentane.
1, 3 butadiene.
tetra methyl ethylene.
✅ The correct answer is option B.
29. The most suitable solvent for deasphalting vacuum residue is
propane
methyl ethyl ketone
doctor’s solution
methanol amine
✅ The correct answer is option B.
30. __________ test is done to find out the softening point of bitumen.
Impact
Ball and ring
Flame
Viscosity
✅ The correct answer is option B.