Multiple Choice Questions and Answers (MCQ) on Petroleum Refinery Engineering
01. With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
(A) Decreases
(B) Increases
(C) Remain same
(D) Unpredictable from the data
Answer: Option B
02. Which is the most ideal feed stock for ‘coking’ process used for the manufacture of petroleum coke?
(A) Naphtha
(B) Vacuum residue
(C) Light gas oil
(D) Diesel
Answer: Option B
03. Feedstock for the production of biodiesel is
(A) Herbal plants
(B) Used vegetable oils
(C) LSHS
(D) Bagasse
Answer: Option B
04. Which of the following has maximum hydrogen/carbon ratio (by weight)?
(A) Naphtha
(B) Gasoline
(C) Diesel
(D) Fuel oil
Answer: Option B
05. 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.
(A) 736
(B) 727.5
(C) 512
(D) 767.8
Answer: Option A
06. Methyl tertiary butyl ether (MTBE), a high octane (octane no. = 115) gasoline blending component is produced by the simple additive reaction of isobutylene with
(A) Methyl alcohol
(B) Ethyl alcohol
(C) Methane
(D) Ethane
Answer: Option A
07. The first crude oil refinery of India is located at
(A) Naharkatiya
(B) Digboi
(C) Kochi
(D) Madras
Answer: Option B
08. CnH2n is the general formula for
(A) Olefins
(B) Naphthenes
(C) Both (A) and (B)
(D) Neither (A) nor (B)
Answer: Option C
09. The general formula of naphthenes is
(A) CnH2n + 2
(B) CnH2n-6 (where, n ≥ 6)
(C) CnHn-4
(D) Same as that for olefins i.e. CnH2n
Answer: Option B
10. Carbon percentage (by weight) in crude petroleum may be about
(A) 65
(B) 75
(C) 85
(D) 95
Answer: Option C
11. Solvent used for dewaxing of petroleum products are
(A) Furfural
(B) Methyl ethyl ketone (MEK)
(C) Propane
(D) Both (B) & (C)
Answer: Option C
12. In catalytic cracking, the
(A) Gasoline obtained has a very low octane number
(B) Pressure & temperature is very high
(C) Gasoline obtained has very high aromatic content
(D) Gasoline obtained has very high amount of gum forming compounds
Answer: Option C
13. Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C?
(A) Naphtha
(B) Petrol
(C) Kerosene
(D) Heavy fuel oil
Answer: Option D
14. Pressure & temperature maintained in catalytic cracking is about
(A) 2 atm & 500°C
(B) 10 atm & 500°C
(C) 30 atm & 200°C
(D) 50 atm & 750°C
Answer: Option A
15. An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.
(A) 5
(B) 15
(C) 40
(D) 60
Answer: Option C
16. Flash point of a liquid petroleum fuel gives an idea about its
(A) Volatility
(B) Explosion hazards characteristics
(C) Nature of boiling point diagram
(D) All (A), (B) and (C)
Answer: Option D
17. Hydrogen percentage (by weight) in crude petroleum may be about
(A) 5
(B) 15
(C) 25
(D) 35
Answer: Option B
18. Which of the following has the lowest cetane number?
(A) Aromatics
(B) i-paraffins
(C) Naphthene
(D) Olefins
Answer: Option A
19. Catalyst used in catalytic polymerisation which produces polymer gasoline is
(A) H2SO4
(B) H3PO4
(C) Both (A) and (B)
(D) AlCl3
Answer: Option C
20. Liquefied Petroleum Gas (LPG) is mainly a mixture of
(A) Propane & butane
(B) Methane & ethane
(C) High boiling olefins
(D) High boiling naphthenes
Answer: Option A
21. Pick out the correct statement pertaining to catalytic cracking.
(A) With increase in the reactor pressure, octane number of gasoline decreases
(B) With increase in the reactor temperature, gasoline yield decreases for a given conversion
(C) Percentage conversion increases with increase in the catalyst to oil ratio
(D) All (A), (B) and (C)
Answer: Option D
22. The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mm Hg.
(A) 1.2
(B) 12
(C) 120
(D) 700
Answer: Option C
23. Flash point of an oil is determined by the
(A) Pensky Martens apparatus
(B) Ramsbottom apparatus
(C) Saybolt viscometer
(D) Conradson apparatus
Answer: Option A
24. 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
Answer: Option B
25. Visbreaking
(A) Uses natural gas as feed
(B) Is carried out at atmospheric pressure
(C) Produces fuel oil of lower viscosity
(D) Produces gasoline only
Answer: Option C