MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.$? |
| A. | Viscosity |
| B. | Thermal conductivity |
| C. | Surface tension |
| D. | Density |
| Answer» E. | |
| 2. |
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is$? |
| A. | 4 |
| B. | 1/4 |
| C. | 1 |
| D. | 1/2 |
| Answer» C. 1 | |
| 3. |
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as$? |
| A. | Np ‚Äö√ √π NRe |
| B. | Np ‚à ù ‚à öNRe |
| C. | Np ‚Üí constant |
| D. | Np ‚Äö√ √π 1/NRe |
| Answer» E. | |
| 4. |
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?? |
| A. | Compartment mill |
| B. | Rod mill |
| C. | Pebble mill |
| D. | Tube mill |
| Answer» C. Pebble mill | |
| 5. |
Gizzlies are used for separating __________ solids.? |
| A. | Coarse |
| B. | Fine |
| C. | Any size |
| D. | None of these |
| Answer» C. Any size | |
| 6. |
Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.? |
| A. | Viscosity |
| B. | Thermal conductivity |
| C. | Surface tension |
| D. | Density |
| Answer» E. | |
| 7. |
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is? |
| A. | 4 |
| B. | 1/4 |
| C. | 1 |
| D. | 1/2 |
| Answer» C. 1 | |
| 8. |
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as? |
| A. | Np ‚Äö√ √π NRe |
| B. | Np ‚à ù ‚à öNRe |
| C. | Np ‚Üí constant |
| D. | Np ‚Äö√ √π 1/NRe |
| Answer» E. | |
| 9. |
Moore filter is a __________ filter.? |
| A. | Leaf |
| B. | Press |
| C. | Rotary |
| D. | Sand |
| Answer» B. Press | |
| 10. |
Which of the following is the most suitable for handling fibrous and dense slurries?? |
| A. | Propeller agitator |
| B. | Cone type agitator |
| C. | Turbine agitator |
| D. | Radial propeller agitator |
| Answer» C. Turbine agitator | |
| 11. |
A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.? |
| A. | Compartment |
| B. | Tube |
| C. | Rod |
| D. | Pebble |
| Answer» B. Tube | |
| 12. |
Crushing efficiency of a machine ranges between __________ percent.? |
| A. | 0.1 to 2 |
| B. | 5 to 10 |
| C. | 20 to 25 |
| D. | 50 to 70 |
| Answer» B. 5 to 10 | |
| 13. |
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. | |
| 14. |
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 | |
| 15. |
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 | |
| 16. |
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.? |
| A. | Smallest |
| B. | Largest |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» E. | |
| 17. |
Energy consumed for crushing one ton of material ranges from __________ kWh.? |
| A. | 0.01 to 0.1 |
| B. | 0.5 to 1.5 |
| C. | 2 to 3.5 |
| D. | 4 to 5 |
| Answer» C. 2 to 3.5 | |
| 18. |
A propeller agitator? |
| A. | Produces mainly axial flow |
| B. | Is used for mixing high viscosity pastes |
| C. | Runs at very slow speed (2 rpm) |
| D. | All of the above |
| Answer» B. Is used for mixing high viscosity pastes | |
| 19. |
Shell and leaf filter as compared to plate and frame filter? |
| A. | Entails less labor cost |
| B. | Facilitates filtration under higher pressure |
| C. | Provides more effective washing |
| D. | All of the above |
| Answer» E. | |
| 20. |
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.? |
| A. | 3 to 4 |
| B. | 8 to 10 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» B. 8 to 10 | |
| 21. |
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.? |
| A. | Vacuum |
| B. | Sand |
| C. | Plate & frame |
| D. | Rotary |
| Answer» C. Plate & frame | |
| 22. |
The filter medium resistance is controlled by? |
| A. | Pressure drop alone |
| B. | Flow rate alone |
| C. | Both pressure drop and flow rate |
| D. | Cake thickness |
| Answer» D. Cake thickness | |
| 23. |
The main differentiation factor between tube mill and ball mill is the? |
| A. | Length to diameter ratio |
| B. | Size of the grinding media |
| C. | Final product size |
| D. | Operating speed |
| Answer» B. Size of the grinding media | |
| 24. |
In a roll crusher, the specific power consumption and the production rate is affected by the? |
| A. | Reduction ratio |
| B. | Differential roll speed |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 25. |
As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms )? |
| A. | LS |
| B. | 93 LS |
| C. | 250 LS |
| D. | ‚à öLS |
| Answer» C. 250 LS | |
| 26. |
Which of the following minerals is not subjected to magnetic separation method?? |
| A. | Rutile |
| B. | Galena |
| C. | Chromite |
| D. | Siderite |
| Answer» C. Chromite | |
| 27. |
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)? |
| A. | 3.6 V.W.Dr.ρ |
| B. | 3.6 V.W. ρ |
| C. | 3.6 W.Dr.ρ |
| D. | 3.6 V.W.Dr/ρ |
| Answer» B. 3.6 V.W. ≈ì√Ö | |
| 28. |
Horsepower required for a roll crusher is directly proportional to its? |
| A. | Reduction ratio |
| B. | Capacity |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 29. |
The porosity of a compressible cake is? |
| A. | Minimum at the filter medium |
| B. | Minimum at the upstream face |
| C. | Maximum at the filter medium |
| D. | Same throughout the thickness of cake |
| Answer» B. Minimum at the upstream face | |
| 30. |
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their? |
| A. | Particle sizes |
| B. | Densities |
| C. | Terminal velocities |
| D. | None of these |
| Answer» D. None of these | |
| 31. |
Which of the following is not a non-metalliferous mineral?? |
| A. | Calcite |
| B. | Fluorspar |
| C. | Quartz |
| D. | Cassiterrite |
| Answer» E. | |
| 32. |
Gravity settling process is not involved in the working of a? |
| A. | Hydrocyclone |
| B. | Classifier |
| C. | Dorr-thickener |
| D. | Sedimentation tank |
| Answer» B. Classifier | |
| 33. |
Which of the following relationships between co-efficinet 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. ≈í√∫ > tan 2≈í¬± | |
| 34. |
During filtration operation, the filtrate encounters the resistance of the? |
| A. | Filter medium |
| B. | Cake |
| C. | Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium |
| D. | All of the above |
| Answer» E. | |
| 35. |
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 | |
| 36. |
The material is crushed in a gyratory crusher by the action of? |
| A. | Impact |
| B. | Compression |
| C. | Attrition |
| D. | Cutting |
| Answer» C. Attrition | |
| 37. |
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? |
| A. | Sphere |
| B. | Cube |
| C. | Cylinder (L/D = 1) |
| D. | Raschig rings |
| Answer» B. Cube | |
| 38. |
Which of the following screens has the maximum capacity? |
| A. | Grizzlies |
| B. | Trommels |
| C. | Shaking screen |
| D. | Vibrating screen |
| Answer» E. | |
| 39. |
Which one is a filter aid? |
| A. | Convas fabric |
| B. | Diatomaceous earth |
| C. | Calcined lime |
| D. | None of these |
| Answer» C. Calcined lime | |
| 40. |
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m³)$ |
| A. | 3.6 W.D.V.ρ |
| B. | 3.6 W.D.V. |
| C. | 3.6 W.V.ρ |
| D. | 3.6 D.V.ρ |
| Answer» B. 3.6 W.D.V. | |
| 41. |
Which is a secondary crusher for a hard & tough stone? |
| A. | Jaw crusher |
| B. | Cone crusher |
| C. | Impact crusher |
| D. | Toothed roll crusher |
| Answer» C. Impact crusher | |
| 42. |
Which of the following is a batch sedimentation equipment? |
| A. | Dust catcher |
| B. | Filter thickener |
| C. | Dry cyclone separator |
| D. | Rotary sprayer scrubber |
| Answer» C. Dry cyclone separator | |
| 43. |
The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size ) |
| A. | C/s |
| B. | S/c |
| C. | S . c |
| D. | 1/s . c |
| Answer» B. S/c | |
| 44. |
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid? |
| A. | Sand bed filter |
| B. | Plate and frame filter press |
| C. | Vacuum filter |
| D. | Batch basket centrifuge |
| Answer» D. Batch basket centrifuge | |
| 45. |
Which is the most suitable conveyor for transportation of sticky material? |
| A. | Apron conveyor |
| B. | Belt conveyor |
| C. | Screw conveyor |
| D. | Pneumatic conveyor |
| Answer» D. Pneumatic conveyor | |
| 46. |
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 | |
| 47. |
Which of the following is the softest material? |
| A. | Talc |
| B. | Feldspar |
| C. | Corundum |
| D. | Calcite |
| Answer» B. Feldspar | |
| 48. |
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)# |
| A. | M/ρ . Vp |
| B. | M . ρ/Vp |
| C. | M . Vp/ρ |
| D. | Vp/m . ρ |
| Answer» B. M . ≈ì√Ö/Vp | |