MCQOPTIONS
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MCQOPTIONS
This section includes 23 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 processes in oil refinery does not employ \'cracking\' ? |
| A. | Visbreaking |
| B. | Coking |
| C. | None of these |
| D. | Pyrolysis |
| Answer» D. Pyrolysis | |
| 2. |
The pressure (kg/cm2 ) and temperature (°C) maintained in electrical desalters for crude oil are respectively |
| A. | 1 and 200 |
| B. | 10 and 120 |
| C. | 10 and 300 |
| D. | 50 and 250 |
| Answer» B. 10 and 120 | |
| 3. |
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» E. | |
| 4. |
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 | |
| 5. |
Flash point of diesel/kerosene (>50°C) is determined by the |
| A. | Abel apparatus |
| B. | Pensky-Martens apparatus |
| C. | Saybolt chromometer |
| D. | none of these |
| Answer» C. Saybolt chromometer | |
| 6. |
Raw Kerosene has a smoke point of 15 mm. After it is subjected to dearomatisation by liquid SO 2 extraction (Edeleanu process), its smoke point may become __________ mm. |
| A. | 5 |
| B. | 10 |
| C. | 25 |
| D. | 100 |
| Answer» D. 100 | |
| 7. |
Which of the following has the maximum °API gravity of all? |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» D. Furnace oil | |
| 8. |
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» D. naphthenes | |
| 9. |
Aniline point of high speed diesel may be about __________ °C. |
| A. | 35 |
| B. | 70 |
| C. | 105 |
| D. | 150 |
| Answer» C. 105 | |
| 10. |
Which of the following has the minimum °API gravity of all? |
| A. | Diesel |
| B. | Kerosene |
| C. | Petrol |
| D. | Furnace oil |
| Answer» E. | |
| 11. |
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» B. 727.5 | |
| 12. |
Concentration of H 2 SO 4 catalyst in alkyla-tion is kept between 90-98%, because H 2 SO 4 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). | |
| 13. |
Octane number of n -heptane is assumed to be |
| A. | 100 |
| B. | 0 |
| C. | 70 |
| D. | ? |
| Answer» C. 70 | |
| 14. |
C n H 2n is the general formula for |
| A. | olefins |
| B. | naphthenes |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 15. |
Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about __________ kg/cm 2 . |
| A. | 1.5 |
| B. | 3 |
| C. | 6 |
| D. | 12 |
| Answer» C. 6 | |
| 16. |
95% (by volume) of LPG at 760 mm Hg pressure will evaporate at __________ °C. |
| A. | 2 |
| B. | -40 |
| C. | 30 |
| D. | 55 |
| Answer» B. -40 | |
| 17. |
Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 18. |
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C. |
| A. | 50 |
| B. | 70 |
| C. | 90 |
| D. | 140 |
| Answer» D. 140 | |
| 19. |
The pressure (kg/cm 2 ) 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» B. 1 and 200 | |
| 20. |
Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm 2 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. | |
| 21. |
Flash point of motor gasoline may be around __________ °C. |
| A. | 10 |
| B. | 45 |
| C. | 100 |
| D. | 150 |
| Answer» C. 100 | |
| 22. |
For gasoline, the flash point ( |
| A. | Abel apparatus. |
| B. | Pensky-Marten's apparatus. |
| C. | Saybolt chromometer. |
| D. | none of these. |
| Answer» B. Pensky-Marten's apparatus. | |
| 23. |
Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ? |
| A. | Diesel |
| B. | Gasoline |
| C. | Atmospheric gas oil |
| D. | Vacuum gas oil |
| Answer» C. Atmospheric gas oil | |