MCQOPTIONS
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MCQOPTIONS
This section includes 99 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic |
| A. | Cracking |
| B. | Polymerisation |
| C. | Reforming |
| D. | Isomerisation |
| Answer» D. Isomerisation | |
| 2. |
Extractor temperature is maintained at -20°C in Edeleanu process to reduce the __________ of kerosene. |
| A. | Smoke point |
| B. | Paraffins |
| C. | Aromatics |
| D. | Naphthenes |
| Answer» C. Aromatics | |
| 3. |
'Solvent naphtha' used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts. |
| A. | Steam reforming |
| B. | Distillation |
| C. | Desulphurisation |
| D. | None of these |
| Answer» C. Desulphurisation | |
| 4. |
Most widely used solvent for dewaxing is |
| A. | Methyl-ethyl-ketone (MEK) |
| B. | Naphtha |
| C. | Petroleum ether |
| D. | Sodium plumbite |
| Answer» B. Naphtha | |
| 5. |
Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its |
| A. | Molecular weight |
| B. | Aromatics content |
| C. | Both ‘a’ & ‘b’ |
| D. | Neither ‘a’ nor ‘b’ |
| Answer» D. Neither ‘a’ nor ‘b’ | |
| 6. |
Which of the following is not a sulphur compound present in petroleum? |
| A. | Thiophenes |
| B. | Mercaptans |
| C. | Sulphones |
| D. | Pyrroles |
| Answer» E. | |
| 7. |
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about |
| A. | 45 |
| B. | 55 |
| C. | 70 |
| D. | 90 |
| Answer» D. 90 | |
| 8. |
Pour point of a petrofuel is |
| A. | Multiple of 3°F |
| B. | Multiple of 5°F |
| C. | 5°C below the temperature at which oil ceases to flow |
| D. | None of these |
| Answer» D. None of these | |
| 9. |
Molecular weight of crude petroleum may be around |
| A. | 50 |
| B. | 250 |
| C. | 1500 |
| D. | 5000 |
| Answer» D. 5000 | |
| 10. |
The characterisation factor of crude petroleum oil is around |
| A. | 3 |
| B. | 11 |
| C. | 22 |
| D. | 28 |
| Answer» C. 22 | |
| 11. |
Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about __________ of that of water (i.e. 1 gm/c.c). |
| A. | One fourth |
| B. | One third |
| C. | Half |
| D. | One eighth |
| Answer» D. One eighth | |
| 12. |
Pick out the wrong statement |
| A. | Higher temperature is employed in visbreaking than in thermal cracking |
| B. | Pyrolysis is a mild thermal cracking process |
| C. | Lead susceptibility of petrol produced by catalytic process is more than that produced by thermal cracking |
| D. | Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process |
| Answer» B. Pyrolysis is a mild thermal cracking process | |
| 13. |
Higher pressure in the reforming reactor |
| A. | Increases coke formation |
| B. | Increases the rate of reaction |
| C. | Produces high octane number gasoline |
| D. | None of these |
| Answer» E. | |
| 14. |
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. | |
| 15. |
__________ base crude oil is also called asphaltic crude. |
| A. | Paraffinic |
| B. | Naphthenic |
| C. | Mixed |
| D. | Aromatic |
| Answer» C. Mixed | |
| 16. |
A typical yield of diesel in straight run distillation of crude oil may be about __________ percent. |
| A. | 8 |
| B. | 18 |
| C. | 28 |
| D. | 35 |
| Answer» B. 18 | |
| 17. |
The most suitable solvent for deasphalting vacuum residue is |
| A. | Propane |
| B. | Methyl ethyl ketone |
| C. | Doctors solution |
| D. | Methanol amine |
| Answer» C. Doctors solution | |
| 18. |
Crude topping column operates at __________ pressure |
| A. | Atmospheric |
| B. | 10 atm |
| C. | Vacuum |
| D. | 3 atm |
| Answer» B. 10 atm | |
| 19. |
. Smoke point of kerosene is the |
| A. | Time after which smoking starts on burning |
| B. | Temperature at which smoking starts |
| C. | Maximum height of flame (in mm) without causing smoking, when burnt in a standard lamp |
| D. | None of these |
| Answer» C. Maximum height of flame (in mm) without causing smoking, when burnt in a standard lamp | |
| 20. |
Catalyst used in the catalytic polymerisation is |
| A. | Phosphoric acid on kieselguhr |
| B. | Aluminium chloride |
| C. | Nickel |
| D. | Vanadium pentoxide |
| Answer» B. Aluminium chloride | |
| 21. |
Which of the following petroleum products contain minimum sulphur? |
| A. | Naphtha |
| B. | Kerosene |
| C. | LSHS |
| D. | Furnace oil |
| Answer» B. Kerosene | |
| 22. |
Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline. |
| A. | Polymer |
| B. | Unleaded |
| C. | Casing head |
| D. | Straight run |
| Answer» C. Casing head | |
| 23. |
Ethyl mercaptan is a/an __________ compound. |
| A. | Sulphur |
| B. | Nitrogen |
| C. | Oxygen |
| D. | None of these |
| Answer» B. Nitrogen | |
| 24. |
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 | |
| 25. |
________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation. |
| A. | Magnesium |
| B. | Potassium |
| C. | Calcium |
| D. | Sodium |
| Answer» B. Potassium | |
| 26. |
Electrical desalting of crude oil removes the __________ impurities. |
| A. | Oleophilic |
| B. | Oleophobic |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» C. Both (A) and (B) | |
| 27. |
Clay treatment is used to remove |
| A. | Salt from the crude oil |
| B. | Colour & dissolved gases from cracked gasoline |
| C. | Wax from lube oil |
| D. | None of these |
| Answer» D. None of these | |
| 28. |
Increase in the specific gravity of petroleum products indicates |
| A. | Decrease in paraffin content |
| B. | Increase in thermal energy per unit weight |
| C. | Increase in aromatic content |
| D. | Higher H/C ratio |
| Answer» B. Increase in thermal energy per unit weight | |
| 29. |
Which of the following is the easiest to crack? |
| A. | Paraffins |
| B. | Olefins |
| C. | Naphthenes |
| D. | Aromatics |
| Answer» B. Olefins | |
| 30. |
The average boiling point of aviation turbine fuel is closest to that of |
| A. | Lubricating oils |
| B. | LPG |
| C. | Diesel |
| D. | Kerosene |
| Answer» E. | |
| 31. |
Which parameter is used for the grading of paraffin waxes? |
| A. | Specific gravity |
| B. | Melting point |
| C. | Viscosity |
| D. | Penetration number |
| Answer» D. Penetration number | |
| 32. |
Aromatics are desired constituents of |
| A. | Lubricating oil |
| B. | Diesel |
| C. | Kerosene |
| D. | Petrol |
| Answer» E. | |
| 33. |
Higher vapour pressure of gasoline indicates |
| A. | Low flash point |
| B. | High breathing loss |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» E. | |
| 34. |
Testing of the knocking characteristics of petrofuels is done in a __________ engine. |
| A. | Carnot |
| B. | CFR (Co-operative fuel research) |
| C. | Stirling |
| D. | Diesel |
| Answer» C. Stirling | |
| 35. |
1 centistoke is equal to __________ Redwood I seconds. |
| A. | 1 |
| B. | 4.08 |
| C. | 0.408 |
| D. | 40.8 |
| Answer» C. 0.408 | |
| 36. |
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) | |
| 37. |
Which of the following fractions of petroleum contains maximum sulphur? |
| A. | Diesel |
| B. | Gasoline |
| C. | Naphtha |
| D. | Atmospheric residue |
| Answer» E. | |
| 38. |
Good quality kerosene should have |
| A. | Low smoke point |
| B. | High smoke point |
| C. | High aromatics content |
| D. | Low paraffins content |
| Answer» C. High aromatics content | |
| 39. |
Sour crude means the __________ bearing crude. |
| A. | Asphalt |
| B. | Sulphur compounds |
| C. | Wax |
| D. | Nitrogen compounds |
| Answer» C. Wax | |
| 40. |
Catalyst used in alkylation process is |
| A. | Sulphuric acid |
| B. | Nickel |
| C. | Silica gel |
| D. | Alumina |
| Answer» B. Nickel | |
| 41. |
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 |
| Answer» E. | |
| 42. |
Cracking is |
| A. | An exothermic reaction |
| B. | An endothermic reaction |
| C. | Favoured at very low temperature |
| D. | None of these |
| Answer» C. Favoured at very low temperature | |
| 43. |
Quinoline is a/an __________ compound. |
| A. | Sulphur |
| B. | Nitrogen |
| C. | Oxygen |
| D. | None of these |
| Answer» C. Oxygen | |
| 44. |
Concentration of H2SO4 catalyst in alkylation is kept between 90-98%, because H2SO4 having concentration. |
| A. | Less than 90% promotes polymerisation |
| B. | More than 98% promotes cracking |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» D. Neither (A) nor (B) | |
| 45. |
During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water. |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | Decreases linearly |
| Answer» C. Remains unchanged | |
| 46. |
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. | |
| 47. |
Tetra-ethyl lead is added in gasoline to |
| A. | Increase its smoke point |
| B. | Reduce gum formation |
| C. | Reduce the pour point |
| D. | Increase its octane number |
| Answer» E. | |
| 48. |
Octane number of n-heptane is assumed to be |
| A. | 100 |
| B. | 0 |
| C. | 70 |
| D. | ∞ |
| Answer» C. 70 | |
| 49. |
Which of the following categories of gasoline has the highest lead susceptibility? |
| A. | Straight run gasoline |
| B. | Platinum reformed gasoline |
| C. | Catalytical cracked gasoline |
| D. | Polymer gasoline |
| Answer» B. Platinum reformed gasoline | |
| 50. |
Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners? |
| A. | PCM |
| B. | Tar |
| C. | Light diesel oil |
| D. | Low viscosity furnace oil |
| Answer» D. Low viscosity furnace oil | |