Petroleum Refinery Chemical Engineer Questions Answers - Set 10 - ObjectiveBooks

Petroleum Refinery Chemical Engineer Questions Answers - Set 10

Practice Test: Question Set - 10

1. Cetane number of a diesel fuel is the measure of its
    (A) Ignition delay
    (B) Smoke point
    (C) Viscosity
    (D) Oxidation stability

2. Mercaptans is represented as (where R and R' are alkyl groups)
    (A) R-COOH
    (B) R-S-H
    (C) R-S-R
    (D) R-S-R'

3. Water content in the crude oil as it comes out of oil well may be upto __________ percent.
    (A) 2
    (B) 5
    (C) 10
    (D) 25

4. Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
    (A) Smoking tendency of hydrocarbons increases in the order: paraffins → isoparaffins → naphthenes → aromatics
    (B) Smoking tendency of paraffins increases with decrease in its molecular weight
    (C) Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond
    (D) Smoking tendency of aromatics decreases with increase in its molecular weight

5. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
    (A) More than 100
    (B) Round about 100
    (C) Between 50 and 100
    (D) Less than 25

6. Antioxidants are added in petrol to
    (A) Impart color to it, for easy identification
    (B) Minimize the gum formation
    (C) Prevent icing of the carburetor
    (D) Prevent the lead build up in engines

7. Aniline point is the temperature at which
    (A) Equal weight of diesel & the aniline are completely miscible
    (B) Equal weight of aniline & the test sample are completely miscible
    (C) Equal volume of aniline & the test sample are completely miscible
    (D) Aniline vaporizes

8. Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
    (A) 0.1
    (B) 1
    (C) 2.5
    (D) 3.5

9. Asphalts are
    (A) Low molecular weight & low boiling point compounds present in petroleum
    (B) Desirable in catalytic cracking feedstock, because they produce coke
    (C) Readily oxidisable and form carbonaceous sludge
    (D) All (a), (b) & (c)

10. Glycol added to petrol acts as a/an __________ agent.
    (A) Anti-knocking
    (B) Anti-icing
    (C) Anti-gum forming
    (D) Dewaxing

11. "Breathing loss" on storage of gasoline occurs due to the
    (A) Presence of unsaturated air
    (B) Fluctuation of ambient temperature during day and night
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

12. Most commonly used crude heater before the fractionation tower in a refinery is the __________ heater.
    (A) Electric immersion
    (B) Pipestill
    (C) Steam coil
    (D) None of these

13. Thermofor catalytic cracking process is a __________ process.
    (A) Fixed bed
    (B) Moving bed
    (C) Fluidised bed
    (D) Non-catalytic

14. The most widely used crude topping column in refineries is the __________ column.
    (A) Bubble-cap
    (B) Packed bed
    (C) Fluidized bed
    (D) Perforated plate

15. __________ treatment is done for appreciable improvement in viscosity index of lubricating oil.
    (A) Acid
    (B) Solvent extraction
    (C) Alkali
    (D) Clay

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