MCQOPTIONS
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MCQOPTIONS
This section includes 362 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 terminology is not used for size reduction of materials to fine sizes or powders ? |
| A. | Comminution |
| B. | Dispersion |
| C. | Pulverisation |
| D. | Compression |
| Answer» E. | |
| 2. |
Width and speed of a conveyor belt depends upon the ______________ of the material? |
| A. | Lump size |
| B. | Bulk density |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 3. |
With increase in drum speed, in a rotary drum filter, the filtration rate_______________? |
| A. | Increases |
| B. | Increases linearly |
| C. | Decreases |
| D. | Is not affected |
| Answer» B. Increases linearly | |
| 4. |
With increase in the capacity of screens, the screen effectiveness__________________? |
| A. | Remains unchanged |
| B. | Increases |
| C. | Decreases |
| D. | Decreases exponentially |
| Answer» D. Decreases exponentially | |
| 5. |
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Increases linearly |
| Answer» B. Decreases | |
| 6. |
Work index is defined as the_________________? |
| A. | Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen |
| B. | Energy needed to crush one tonne of feed to 200 microns |
| C. | Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen |
| D. | Energy needed to crush one ton of feed to 100 microns |
| Answer» B. Energy needed to crush one tonne of feed to 200 microns | |
| 7. |
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding? |
| A. | 1.0 |
| B. | 0.5 |
| C. | 1.34 |
| D. | 4.34 |
| Answer» D. 4.34 | |
| 8. |
Xanthates are used in the froth floatation process as a/an _______________________? |
| A. | Conditioner |
| B. | Frother |
| C. | Collector |
| D. | Activator |
| Answer» D. Activator | |
| 9. |
Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ? |
| A. | μ > tan α |
| B. | μ ≥ tan α |
| C. | μ > tan 2α |
| D. | μ ≤ tan α |
| Answer» C. μ > tan 2α | |
| 10. |
Which of the following oxides is not present in hematite iron ore ? |
| A. | Titanium oxide |
| B. | Calcium oxide |
| C. | Cobalt oxide |
| D. | Manganese oxide |
| Answer» D. Manganese oxide | |
| 11. |
Which of the following minerals is not subjected to magnetic separation method ? |
| A. | Rutile |
| B. | Galena |
| C. | Chromite |
| D. | Siderite |
| Answer» C. Chromite | |
| 12. |
Which of the following mineral dressing operations is termed as ‘comminution’? |
| A. | Panning |
| B. | Spiralling |
| C. | Tabling |
| D. | None of these |
| Answer» E. | |
| 13. |
Which of the following mechanical conveyors does not come under the division „carriers‟ ? |
| A. | Belt conveyor |
| B. | Bucket elevator |
| C. | Screw conveyor |
| D. | Apron conveyor |
| Answer» D. Apron conveyor | |
| 14. |
Which of the following mechanical conveyors does not come under the division „scrapers‟ ? |
| A. | Ribbon conveyor |
| B. | Flight conveyor |
| C. | Bucket elevators |
| D. | Drag conveyor |
| Answer» D. Drag conveyor | |
| 15. |
Which of the following is not used as filter aid ? |
| A. | Asbestos |
| B. | Diatomaceous earth |
| C. | Purified wood cellulose |
| D. | Rice husk |
| Answer» E. | |
| 16. |
Which of the following is not used as a surface active agent in a flocculation operation ? |
| A. | Sodium silicate |
| B. | Quartz |
| C. | Lime |
| D. | Alumina |
| Answer» C. Lime | |
| 17. |
Which of the following is not categorised as a “mechanical operation”? |
| A. | Agitation |
| B. | Filtration |
| C. | Size enlargement |
| D. | Humidification |
| Answer» E. | |
| 18. |
Which of the following is not an ultrafine grinder (colloid mill) ? |
| A. | Micronizers |
| B. | Agitated mills and fluid energy mills |
| C. | Toothed roll crusher |
| D. | Hammer mills with internal classification |
| Answer» D. Hammer mills with internal classification | |
| 19. |
Which of the following is not accomplished by agitation of liquids in agitators ? |
| A. | Dispersing gas in liquid |
| B. | Blending of immiscible liquids |
| C. | Dispersing immiscible liquid in form of emulsion |
| D. | Suspending solid particles |
| Answer» C. Dispersing immiscible liquid in form of emulsion | |
| 20. |
Which of the following is not a revolving/tumbling mill used for size reduction ? |
| A. | Compartment mill |
| B. | Pebble mill |
| C. | Cage mill |
| D. | Rod mill |
| Answer» D. Rod mill | |
| 21. |
Which of the following is not a part of the Blake jaw crusher ? |
| A. | Hanger |
| B. | Check plates |
| C. | Toggles |
| D. | Pitman |
| Answer» B. Check plates | |
| 22. |
Which of the following is not a non-metalliferous mineral ? |
| A. | Calcite |
| B. | Fluorspar |
| C. | Quartz |
| D. | Cassiterite |
| Answer» E. | |
| 23. |
Which of the following is not a cutting machine ? |
| A. | Dicers |
| B. | Knife cutters |
| C. | Slitters |
| D. | Tube mills |
| Answer» E. | |
| 24. |
Which of the following is a fine crusher ? |
| A. | Blake jaw crusher |
| B. | Gyratory crusher |
| C. | Toothed roll crusher |
| D. | Dodge jaw crusher |
| Answer» D. Dodge jaw crusher | |
| 25. |
Which of the following is a continuous filter ? |
| A. | Plate and frame filter |
| B. | Cartridge filter |
| C. | Shell and leaf filter |
| D. | None of these |
| Answer» E. | |
| 26. |
Which of the following is a coarse crusher ? |
| A. | Smooth roll crusher |
| B. | Toothed roll crusher |
| C. | Gyratory crusher |
| D. | Tube mill |
| Answer» D. Tube mill | |
| 27. |
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately? |
| A. | Rittinger’s law |
| B. | Kick’s law |
| C. | Bond’s law |
| D. | None of these |
| Answer» B. Kick’s law | |
| 28. |
Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ? |
| A. | P/m = K/ √Dp |
| B. | P/m = K . ln D̅ sa/D̅ sb |
| C. | P/m = K . (1/ D̅ sb – 1/D̅ sa) |
| D. | None of these |
| Answer» D. None of these | |
| 29. |
Which of the following clay mixing devices is vacuum operated for deairation of clay ? |
| A. | Banbury mixer |
| B. | Pug mill |
| C. | Muller-mixer |
| D. | None of these |
| Answer» C. Muller-mixer | |
| 30. |
Which of the following can be most effectively used for clarification of lube oil and printing ink ? |
| A. | Sparkler filter |
| B. | Pre-coat filter |
| C. | Disc-bowl centrifuge |
| D. | Sharpies super-centrifuge |
| Answer» E. | |
| 31. |
Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ? |
| A. | Propeller |
| B. | Helical screw |
| C. | Flat blade turbine |
| D. | Curved blade turbine |
| Answer» C. Flat blade turbine | |
| 32. |
Which of the following achieves the least reduction ratio for a given feed size ? |
| A. | Jaw crusher |
| B. | Roll crusher |
| C. | Cone crusher |
| D. | Gyratory crusher |
| Answer» C. Cone crusher | |
| 33. |
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a____________________? |
| A. | Disc bowl centrifuge |
| B. | Sharpies super-centrifuge |
| C. | Batch basket centrifuge |
| D. | Sparkler filter |
| Answer» B. Sharpies super-centrifuge | |
| 34. |
Wheat is ground into flour in a___________________? |
| A. | Hammer crusher |
| B. | Roller crusher |
| C. | Impact mill |
| D. | Fluid energy mill |
| Answer» C. Impact mill | |
| 35. |
What is the reduction ratio in a fine crushing operation having following feed and product sizes ? |
| A. | 0.5 |
| B. | 2 |
| C. | 5 |
| D. | 10 |
| Answer» C. 5 | |
| 36. |
Wet sieving is employed, when the product contains ________________ materials? |
| A. | Abrasive |
| B. | Large quantity of very fine |
| C. | Coarse |
| D. | Non-sticky |
| Answer» C. Coarse | |
| 37. |
Wet grinding in a revolving mill ______________ as compared to dry grinding ? |
| A. | Gives less wear on chamber walls |
| B. | Requires more energy |
| C. | Increases capacity |
| D. | Complicates handling of the product |
| Answer» D. Complicates handling of the product | |
| 38. |
Weber number is significant and is concerned with the_________________? |
| A. | Solid-liquid mixing |
| B. | Liquid-liquid mixing |
| C. | Dispersion of liquid in liquid |
| D. | Suspension of solid in liquid |
| Answer» D. Suspension of solid in liquid | |
| 39. |
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________? |
| A. | Density separation |
| B. | Differential wettability |
| C. | Size |
| D. | Volatile matter content |
| Answer» B. Differential wettability | |
| 40. |
Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size? |
| A. | 0.2 to 0.8 |
| B. | 5 to 25 |
| C. | 50 to 100 |
| D. | 100 to 250 |
| Answer» B. 5 to 25 | |
| 41. |
Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________? |
| A. | Electromagnets |
| B. | Cams or eccentric shafts |
| C. | Unbalanced flywheels |
| D. | Either A., B. or C. |
| Answer» E. | |
| 42. |
Vertical transportation of materials can be done by a/an_______________? |
| A. | Apron conveyor |
| B. | Pneumatic conveyor |
| C. | Bucket elevator |
| D. | Both B. & C. |
| Answer» E. | |
| 43. |
Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ? |
| A. | [(DP/18). (ρs – ρ/μ)] ω2r |
| B. | [(DP2/18). (ρs – ρ/μ)] ω2r |
| C. | [(DP/18). (ρs – ρ/μ)] ω2r2 |
| D. | [(DP2/18). (ρs – ρ/μ)] ω2r |
| Answer» E. | |
| 44. |
Vacuum is applied in _______________ zone, in case of a general type continuous rotary drum vacuum filter? |
| A. | Filtering |
| B. | Washing |
| C. | Drying |
| D. | All A., B. & C. |
| Answer» E. | |
| 45. |
Vacuum filter is most suitable for the_______________? |
| A. | Removal of fines from liquid |
| B. | Liquids having high vapour pressure |
| C. | Liquids of very high viscosity |
| D. | None of these |
| Answer» E. | |
| 46. |
Use of grinding aids results in the ___________________? |
| A. | Enhanced production rate |
| B. | Finer products |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» E. | |
| 47. |
Use of ‘grinding aids’ is done in _______________ grinding? |
| A. | Dry |
| B. | Wet |
| C. | Ultrafine |
| D. | Intermediate |
| Answer» B. Wet | |
| 48. |
Use of baffles in agitators help in minimising the ______________ tendency? |
| A. | Swirling |
| B. | Vortexing |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 49. |
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________? |
| A. | Separation of isotopes based on their density or molecular weights difference |
| B. | Concentration of rubber latex |
| C. | Separation of cream from milk |
| D. | Dewaxing of lubricating oil |
| Answer» B. Concentration of rubber latex | |
| 50. |
Ultrafine grinders operate principally by_________________? |
| A. | Slow compression |
| B. | Impact |
| C. | Attrition |
| D. | Cutting action |
| Answer» D. Cutting action | |