MCQOPTIONS
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MCQOPTIONS
This section includes 398 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.$? |
| A. | Plug |
| B. | Turbulent |
| C. | Laminar |
| D. | None of these |
| Answer» D. None of these | |
| 302. |
With increase in the capacity of screens, the screen effectiveness$? |
| A. | Remains unchanged |
| B. | Increases |
| C. | Decreases |
| D. | Decreases exponentially |
| Answer» D. Decreases exponentially | |
| 303. |
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )$? |
| A. | D |
| B. | 1/D |
| C. | D2.5 |
| D. | 1/D2.5 |
| Answer» D. 1/D2.5 | |
| 304. |
For benefication of iron ore, the most commonly used method is$? |
| A. | Flocculation |
| B. | Froth floatation |
| C. | Jigging & tabling |
| D. | None of these |
| Answer» D. None of these | |
| 305. |
During the washing of cake$? |
| A. | All the resistances are constant |
| B. | Filter medium resistance increases |
| C. | Filter medium resistance decreases |
| D. | Cake resistance decreases |
| Answer» B. Filter medium resistance increases | |
| 306. |
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as$? |
| A. | D |
| B. | ‚à öd |
| C. | D² |
| D. | 1/d |
| Answer» D. 1/d | |
| 307. |
Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?$? |
| A. | Bond's crushing law |
| B. | Kick's law |
| C. | Rittinger's law |
| D. | None of these |
| Answer» D. None of these | |
| 308. |
Which of the following clay mixing devices is vacuum operated for deairation of clay?$? |
| A. | Banbery mixer |
| B. | Pug mill |
| C. | Muller-mixer |
| D. | None of these |
| Answer» C. Muller-mixer | |
| 309. |
Solid particles of different densities are separated by$? |
| A. | Filters |
| B. | Thickness |
| C. | Cyclones |
| D. | Sorting classifier |
| Answer» E. | |
| 310. |
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.$? |
| A. | 20 |
| B. | 12 |
| C. | 8 |
| D. | 2 |
| Answer» E. | |
| 311. |
Which of the following is not a cutting machine?$? |
| A. | Dicers |
| B. | Knife cutters |
| C. | Slitters |
| D. | Tube mills |
| Answer» E. | |
| 312. |
__________ conveyors are also called scrapers.$? |
| A. | Apron |
| B. | Screw |
| C. | Helical flight |
| D. | Both B & C |
| Answer» E. | |
| 313. |
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to$? |
| A. | N° |
| B. | N¬π |
| C. | N² |
| D. | N³ |
| Answer» D. N¬¨‚â• | |
| 314. |
Which of the following is not used as a filter medium in case of corrosive liquids?$? |
| A. | Nylon |
| B. | Glass cloth |
| C. | Metal cloth of monel or stainless steel |
| D. | Cotton fabric |
| Answer» E. | |
| 315. |
Filter medium resistance is that offered by the$? |
| A. | Filter cloth |
| B. | Embedded particles in the septum |
| C. | Filter cloth and the embedded particle collectively |
| D. | None of these |
| Answer» D. None of these | |
| 316. |
The reduction ratio for fine grinders is$? |
| A. | 5-10 |
| B. | 10-20 |
| C. | 20-40 |
| D. | As high as 100 |
| Answer» E. | |
| 317. |
Which of the following achieves the least reduction ratio for a given feed size?$? |
| A. | Jaw crusher |
| B. | Roll crusher |
| C. | Cone crusher |
| D. | Gyratory crusher |
| Answer» C. Cone crusher | |
| 318. |
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for$? |
| A. | British standard screens |
| B. | German standard screens (DIN 1171) etc |
| C. | American standard screens (ASTM and Tyler standard screens) |
| D. | All of the above |
| Answer» E. | |
| 319. |
Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.$? |
| A. | Plane |
| B. | Curved |
| C. | Ribbed |
| D. | Either A or B |
| Answer» D. Either A or B | |
| 320. |
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an$? |
| A. | Bag filter |
| B. | Electrostatic precipitator |
| C. | Cyclone separator |
| D. | Wet scrubber |
| Answer» C. Cyclone separator | |
| 321. |
Close circuit grinding by a ball mill with air sweeping employs a$? |
| A. | Classifier |
| B. | Cyclone separator between mill & classifier |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 322. |
Which of the following comes in the category of primary crusher for hard and tough stone?$? |
| A. | Jaw crusher |
| B. | Cone crusher |
| C. | Gyratory crusher |
| D. | None of these |
| Answer» B. Cone crusher | |
| 323. |
Jigging is a technique by which different particles can be$? |
| A. | Separated by particle size |
| B. | Separated by particle density |
| C. | Separated by particle shape |
| D. | Mixed |
| Answer» B. Separated by particle density | |
| 324. |
Solid particles separation based on the difference in their flow velocities through fluids is termed as the$? |
| A. | Clarification |
| B. | Classification |
| C. | Elutriation |
| D. | Sedimentation |
| Answer» C. Elutriation | |
| 325. |
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)$? |
| A. | 3.6 V.W.Dr.ρ |
| B. | 3.6 V.W. ρ |
| C. | 3.6 W.Dr.ρ |
| D. | 3.6 V.W.Dr/ρ |
| Answer» B. 3.6 V.W. ≈ì√Ö | |
| 326. |
All resistances during washing of cake$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | None of these |
| Answer» D. None of these | |
| 327. |
Which of the following is not a non-metalliferous mineral?$? |
| A. | Calcite |
| B. | Fluorspar |
| C. | Quartz |
| D. | Cassiterrite |
| Answer» E. | |
| 328. |
Gravity settling process is not involved in the working of a$? |
| A. | Hydrocyclone |
| B. | Classifier |
| C. | Dorr-thickener |
| D. | Sedimentation tank |
| Answer» B. Classifier | |
| 329. |
Horsepower required for a roll crusher is directly proportional to its$? |
| A. | Reduction ratio |
| B. | Capacity |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 330. |
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their$? |
| A. | Particle sizes |
| B. | Densities |
| C. | Terminal velocities |
| D. | None of these |
| Answer» D. None of these | |
| 331. |
The porosity of a compressible cake is$? |
| A. | Minimum at the filter medium |
| B. | Minimum at the upstream face |
| C. | Maximum at the filter medium |
| D. | Same throughout the thickness of cake |
| Answer» B. Minimum at the upstream face | |
| 332. |
Energy consumed for crushing one ton of material ranges from __________ kWh.$? |
| 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 | |
| 333. |
A propeller agitator$? |
| A. | Produces mainly axial flow |
| B. | Is used for mixing high viscosity pastes |
| C. | Runs at very slow speed (2 rpm) |
| D. | All of the above |
| Answer» B. Is used for mixing high viscosity pastes | |
| 334. |
Shell and leaf filter as compared to plate and frame filter$? |
| A. | Entails less labor cost |
| B. | Facilitates filtration under higher pressure |
| C. | Provides more effective washing |
| D. | All of the above |
| Answer» E. | |
| 335. |
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.$? |
| A. | 3 to 4 |
| B. | 8 to 10 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» B. 8 to 10 | |
| 336. |
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.$? |
| A. | Vacuum |
| B. | Sand |
| C. | Plate & frame |
| D. | Rotary |
| Answer» C. Plate & frame | |
| 337. |
Wet grinding in a revolving mill __________ as compared to dry grinding.$? |
| A. | Gives less wear on chamber walls |
| B. | Requires more energy |
| C. | Increases capacity |
| D. | Complicates handling of the product |
| Answer» D. Complicates handling of the product | |
| 338. |
Weber number is significant and is concerned with the$? |
| 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 | |
| 339. |
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 ?$? |
| A. | Μ > tan α |
| B. | Μ ≥ tan α |
| C. | Μ > tan 2α |
| D. | Μ ≤ tan α |
| Answer» C. ≈í√∫ > tan 2≈í¬± | |
| 340. |
During filtration operation, the filtrate encounters the resistance of the$? |
| 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. | |
| 341. |
The material is crushed in a gyratory crusher by the action of$? |
| A. | Impact |
| B. | Compression |
| C. | Attrition |
| D. | Cutting |
| Answer» C. Attrition | |
| 342. |
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the$? |
| 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 | |
| 343. |
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.$? |
| A. | Smallest |
| B. | Largest |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» E. | |
| 344. |
Crushing efficiency of a machine ranges between __________ percent.$? |
| A. | 0.1 to 2 |
| B. | 5 to 10 |
| C. | 20 to 25 |
| D. | 50 to 70 |
| Answer» B. 5 to 10 | |
| 345. |
Use of grinding aids results in the$? |
| A. | Enhanced production rate |
| B. | Finer products |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» E. | |
| 346. |
Moore filter is a __________ filter.$? |
| A. | Leaf |
| B. | Press |
| C. | Rotary |
| D. | Sand |
| Answer» B. Press | |
| 347. |
Which of the following is the most suitable for handling fibrous and dense slurries?$? |
| A. | Propeller agitator |
| B. | Cone type agitator |
| C. | Turbine agitator |
| D. | Radial propeller agitator |
| Answer» C. Turbine agitator | |
| 348. |
A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.$? |
| A. | Compartment |
| B. | Tube |
| C. | Rod |
| D. | Pebble |
| Answer» B. Tube | |
| 349. |
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?$? |
| A. | Compartment mill |
| B. | Rod mill |
| C. | Pebble mill |
| D. | Tube mill |
| Answer» C. Pebble mill | |
| 350. |
Gizzlies are used for separating __________ solids.$? |
| A. | Coarse |
| B. | Fine |
| C. | Any size |
| D. | None of these |
| Answer» C. Any size | |