MCQOPTIONS
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MCQOPTIONS
This section includes 246 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following theories of origin of petroleum does not explain the presence of nitrogen & sulphur compounds in crude oil ? |
| A. | Modern theory |
| B. | Carbide theory |
| C. | Engler theory |
| D. | All A., B. and C. |
| Answer» C. Engler theory | |
| 2. |
With increase in density, the viscosity of petroleum products _____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Either A. or B. |
| Answer» B. Decreases | |
| 3. |
With increase in the molecular weight of aromatic present in kerosene, its smoking tendency ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Is unpredictable |
| Answer» B. Decreases | |
| 4. |
Which of the following processes in oil refinery does not employ „cracking‟? |
| A. | Coking |
| B. | Visbreaking |
| C. | Pyrolysis |
| D. | None of these |
| Answer» E. | |
| 5. |
Which of the following is the easiest to crack ? |
| A. | Paraffins |
| B. | Olefins |
| C. | Naphthenes |
| D. | Aromatics |
| Answer» B. Olefins | |
| 6. |
Which of the following is desirable in petrol (gasoline) but undesirable in kerosene ? |
| A. | Paraffins |
| B. | Aromatics |
| C. | Mercaptans |
| D. | Naphthenic acid |
| Answer» D. Naphthenic acid | |
| 7. |
Which of the following is desirable in diesel and kerosene but is undesirable in gasoline ? |
| A. | Aromatics |
| B. | Mercaptans |
| C. | Paraffins |
| D. | Naphthenic acid |
| Answer» B. Mercaptans | |
| 8. |
Which of the following has the lowest viscosity (at a given temperature) of all ? |
| A. | Naphtha |
| B. | Kerosene |
| C. | Diesel |
| D. | Lube oil |
| Answer» B. Kerosene | |
| 9. |
Which of the following has the minimum °API gravity of all ? |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» E. | |
| 10. |
Which of the following has the maximum °API gravity of all ? |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» D. Furnace oil | |
| 11. |
Which of the following has the lowest flash point of all ? |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» D. Furnace oil | |
| 12. |
Which of the following gasoline (unleaded) has the least octane number ? |
| A. | Catalytically cracked gasoline |
| B. | Straight run gasoline |
| C. | Catalytically reformed gasoline |
| D. | Polymer gasoline |
| Answer» C. Catalytically reformed gasoline | |
| 13. |
Which of the following fractions of petroleum contains maximum sulphur ? |
| A. | Diesel |
| B. | Gasoline |
| C. | Naphtha |
| D. | Atmospheric residue |
| Answer» E. | |
| 14. |
Which of the following constituents present in petroleum is responsible for ash formation ? |
| A. | Nitrogen compounds |
| B. | Organometallic compounds |
| C. | Sulphur compounds |
| D. | Oxygen compounds |
| Answer» D. Oxygen compounds | |
| 15. |
Which is almost absent in crude petroleum ? |
| A. | Olefins |
| B. | Mercaptans |
| C. | Naphthenes |
| D. | Cycloparaffins |
| Answer» C. Naphthenes | |
| 16. |
Waxy crudes are treated with chemical additives mainly to_________________________? |
| A. | Depress its pour point |
| B. | Dissolve wax |
| C. | Precipitate wax |
| D. | Remove wax |
| Answer» B. Dissolve wax | |
| 17. |
Waxes present in petroleum products_________________? |
| A. | Can be separated out by distillation |
| B. | Are not soluble in them |
| C. | Crystallise out at low temperature |
| D. | Decrease their viscosity |
| Answer» D. Decrease their viscosity | |
| 18. |
Water separometer index (modified) (WSIM) of a petrofuel is the measure of its____________________? |
| A. | Emulsification tendency |
| B. | Water separation characteristics |
| C. | Water content |
| D. | Water absorbing capacity from atmosphere |
| Answer» C. Water content | |
| 19. |
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 |
| Answer» E. | |
| 20. |
Viscosity index of a lubricating oil_________________? |
| A. | Is the measure of its flash point |
| B. | Is the measure of variation of viscosity with temperature |
| C. | Should be low |
| D. | None of these |
| Answer» C. Should be low | |
| 21. |
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» D. Produces gasoline only | |
| 22. |
Visbreaking process is used mainly for making_________________? |
| A. | High cetane diesel |
| B. | High octane gasoline |
| C. | Fuel oil |
| D. | Smoke free kerosene |
| Answer» D. Smoke free kerosene | |
| 23. |
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 |
| Answer» C. 250 to 350 | |
| 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» C. 150-250 | |
| 25. |
True vapour pressure of a petroleum fraction ________________ Reid vapour pressure? |
| A. | Is less than |
| B. | Is more than |
| C. | Is same as |
| D. | May be either more or less than |
| Answer» E. | |
| 26. |
True boiling point apparatus is used for the__________________? |
| A. | Determination of characterisation factor |
| B. | Evaluation of oil stocks |
| C. | Determination of true vapour pressure |
| D. | None of these |
| Answer» E. | |
| 27. |
________________ treatment is done for appreciable improvement in viscosity index of lubricating oil? |
| A. | Acid |
| B. | Solvent extraction |
| C. | Alkali |
| D. | Clay |
| Answer» C. Alkali | |
| 28. |
Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to__________________? |
| A. | Increase the yield of light distillates |
| B. | Suppress coke formation |
| C. | Enhance the octane number of gasoline |
| D. | Reduce gum content in gasoline |
| Answer» C. Enhance the octane number of gasoline | |
| 29. |
Thermofor catalytic cracking process is a ______________ process? |
| A. | Fixed bed |
| B. | Moving bed |
| C. | Fluidised bed |
| D. | Non-catalytic |
| Answer» E. | |
| 30. |
The yield of straight run LPG from crude oil is about ______________ weight percent? |
| A. | 20-25 |
| B. | 1-1.5 |
| C. | 10-15 |
| D. | 0.1-0.2 |
| Answer» C. 10-15 | |
| 31. |
The vacuum maintained in vacuum distillation unit for reduced crude is about _______________ mm Hg? |
| A. | 1.2 |
| B. | 12 |
| C. | 120 |
| D. | 700 |
| Answer» D. 700 | |
| 32. |
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 |
| Answer» C. Reduced crude | |
| 33. |
The solvent used in Barisol dewaxing process is_____________________? |
| A. | Hexane |
| B. | Furfural |
| C. | Benzol and ethylene dichloride |
| D. | Methyl ethyl ketone (MEK) |
| Answer» D. Methyl ethyl ketone (MEK) | |
| 34. |
The reservoir rock containing petroleum has_________________? |
| A. | Low porosity |
| B. | High permeability |
| C. | High porosity |
| D. | Both B. and C. |
| Answer» E. | |
| 35. |
The proper arrangement of the petroleum fractions in order of their boiling points is __________________ ? |
| A. | Lubricating oil > diesel > petrol > LPG |
| B. | Lubricating oil > petrol > diesel > LPG |
| C. | Petrol > lubricating oil > diesel > LPG |
| D. | Petrol > diesel > LPG > lubricating oil |
| Answer» B. Lubricating oil > petrol > diesel > LPG | |
| 36. |
The pressure (kg/cm2) and temperature (°C) maintained in electrical desalters for crude oil are respectively__________________? |
| A. | 10 and 120 |
| B. | 1 and 200 |
| C. | 50 and 250 |
| D. | 10 and 300 |
| Answer» C. 50 and 250 | |
| 37. |
The order of preference for feedstock to a catalytic reformer is _________________ ? |
| A. | Catalytic naphtha – coking naphtha – virgin naphtha |
| B. | Coking naphtha – virgin naphtha – catalytic naphtha |
| C. | Virgin naphtha – catalytic naphtha – coking naphtha |
| D. | Virgin naphtha – coking naphtha – catalytic naphtha |
| Answer» C. Virgin naphtha – catalytic naphtha – coking naphtha | |
| 38. |
The octane number of aviation gasoline may be __________________? |
| A. | 79 |
| B. | 87 |
| C. | 97 |
| D. | > 100 |
| Answer» E. | |
| 39. |
The most widely used crude topping column in refineries is the ______________ column? |
| A. | Bubble-cap |
| B. | Packed bed |
| C. | Fluidised bed |
| D. | Perforated plate |
| Answer» B. Packed bed | |
| 40. |
The most suitable solvent for deasphalting vacuum residue is_____________________? |
| A. | Propane |
| B. | Methyl ethyl ketone |
| C. | Doctor’s solution |
| D. | Methanol amine |
| Answer» C. Doctor’s solution | |
| 41. |
The most important property for a jet fuel is its________________? |
| A. | Viscosity |
| B. | Freezing point |
| C. | Calorific value |
| D. | Flash point |
| Answer» C. Calorific value | |
| 42. |
The most commonly used feed stock for the reforming reactor is ___________________? |
| A. | Heavy fuel oil |
| B. | Residuum |
| C. | Straight run gasoline |
| D. | Casing head gasoline |
| Answer» D. Casing head gasoline | |
| 43. |
The main use of heavy gas oil produced by the vacuum distillation unit is as a_____________________? |
| A. | Blending component for kerosene |
| B. | Blending component for petrol |
| C. | Feedstock for fluid catalytic cracking unit |
| D. | None of these |
| Answer» D. None of these | |
| 44. |
The main reaction in reforming is the _____________________? |
| A. | Dehydrogenation of naphthenes |
| B. | Hydrogenation of naphthenes |
| C. | Hydrocracking of paraffins |
| D. | Saturation of olefins |
| Answer» B. Hydrogenation of naphthenes | |
| 45. |
The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to ____________________? |
| A. | Obviate catalyst poisoning |
| B. | Maintain the reaction temperature |
| C. | Sustain the reactor pressure |
| D. | Hydrogenate the feed stock |
| Answer» D. Hydrogenate the feed stock | |
| 46. |
The main aim of cracking is to produce ____________________? |
| A. | Gasoline |
| B. | Lube oil |
| C. | Petrolatum |
| D. | Coke |
| Answer» B. Lube oil | |
| 47. |
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» C. CnHn-4 | |
| 48. |
The conductivity of crude oil-water mixture depends on the__________________? |
| A. | pH value |
| B. | Water percentage |
| C. | Temperature |
| D. | All A., B. and C. |
| Answer» E. | |
| 49. |
The condensate obtained on compression of wet natural gas is termed as__________________? |
| A. | Liquefied natural gasoline |
| B. | Natural gasoline |
| C. | Liquid natural gas |
| D. | None of these |
| Answer» C. Liquid natural gas | |
| 50. |
The colour of gasoline is an indication of its _________________? |
| A. | Octane number |
| B. | Lead susceptibility |
| C. | Gum forming tendency & thoroughness of refining |
| D. | None of these |
| Answer» D. None of these | |