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.
| 201. |
_ Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is$? |
| A. | 0.01 to 0.1 |
| B. | 0.1 to 0.3 |
| C. | 0.2 to 0.8 |
| D. | 0.2 to 0.4 |
| Answer» D. 0.2 to 0.4 | |
| 202. |
_ Angle of nip of the crushing rolls does not depend upon the$? |
| A. | Diameter of the rolls |
| B. | Speed of the rolls |
| C. | Product size |
| D. | Feed size |
| Answer» C. Product size | |
| 203. |
_ The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the$? |
| A. | Feed material |
| B. | Type of crushing machine |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 204. |
_ If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the$? |
| A. | Linear speed of the basket is doubled |
| B. | Linear speed of the basket is halved |
| C. | Centrifugal force is doubled |
| D. | Capacity of centrifuge is increased |
| Answer» D. Capacity of centrifuge is increased | |
| 205. |
_ Separation of solid particles based on their densities is called$? |
| A. | Sizing |
| B. | Sorting |
| C. | Clarification |
| D. | Dispersion |
| Answer» C. Clarification | |
| 206. |
_ The capacity of a pneumatic conveying system depends upon the$? |
| A. | Bulk density of materials |
| B. | Pressure of the conveying air |
| C. | Diameter of the conveying line |
| D. | All of the above |
| Answer» E. | |
| 207. |
_ If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the$? |
| A. | Sedimentation |
| B. | Flocculation |
| C. | Dispersion |
| D. | Centrifugation |
| Answer» E. | |
| 208. |
_ Which of the following is not categorised as a "mechanical operation"?$? |
| A. | Agitation |
| B. | Filtration |
| C. | Size enlargement |
| D. | Humidification |
| Answer» E. | |
| 209. |
_ The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be$? |
| A. | 0.5 Wi |
| B. | Wi |
| C. | 1.34 Wi |
| D. | 3.34 Wi |
| Answer» D. 3.34 Wi | |
| 210. |
_ Which of the following can be most effectively used for clarification of lube oil and printing ink?$? |
| A. | Sparkler filter |
| B. | Precoat filter |
| C. | Disc-bowl centrifuge |
| D. | Sharpies supercentrifuge |
| Answer» E. | |
| 211. |
_ __________ mill is not a revolving mill.$? |
| A. | Pebble |
| B. | Compartment |
| C. | Cage |
| D. | Tube |
| Answer» D. Tube | |
| 212. |
_ The controlling resistance in a rotary drum vacuum filter is the __________ resistance.$? |
| A. | Piping |
| B. | Cake |
| C. | Filter medium |
| D. | None of these |
| Answer» C. Filter medium | |
| 213. |
_ The specific cake resistance for compressible sludges is a function of the pressure drop$? |
| A. | Over cake |
| B. | Over medium |
| C. | Overall |
| D. | None of these |
| Answer» B. Over medium | |
| 214. |
_ Mixing mechanism employed in a pan mixer is by$? |
| A. | Mulling |
| B. | Kneading |
| C. | Dispersion |
| D. | None of these |
| Answer» B. Kneading | |
| 215. |
_ Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.$? |
| A. | Metalliferrous ores |
| B. | Non-metallic ores |
| C. | Basic slags |
| D. | Asbestos & mica |
| Answer» B. Non-metallic ores | |
| 216. |
_ Screen capacity is not a function of$? |
| A. | Its openings size |
| B. | Screening mechanism |
| C. | Screening surface |
| D. | Atmospheric humidity |
| Answer» E. | |
| 217. |
_ Crushing efficiency is the ratio of the$? |
| A. | Surface energy created by crushing to the energy absorbed by the solid |
| B. | Energy absorbed by the solid to that fed to the machine |
| C. | Energy fed to the machine to the surface energy created by crushing |
| D. | Energy absorbed by the solid to the surface energy created by crushing |
| Answer» B. Energy absorbed by the solid to that fed to the machine | |
| 218. |
_ In screen analysis, the notation +5 mm/-10 mm means particles passing through$? |
| A. | 10 mm screen and retained on 5 mm screen |
| B. | 5 mm screen and retained on 10 mm screen |
| C. | Both 5 mm and 10 mm screens |
| D. | Neither 5 mm nor 10 mm screen |
| Answer» B. 5 mm screen and retained on 10 mm screen | |
| 219. |
_ For sizing of fine materials, the most suitable equipment is a$? |
| A. | Trommel |
| B. | Grizzly |
| C. | Shaking screen |
| D. | Vibrating screen |
| Answer» E. | |
| 220. |
_ Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an$? |
| A. | Air filter |
| B. | Bag filter |
| C. | Venturi scrubber |
| D. | Hydrocyclones |
| Answer» B. Bag filter | |
| 221. |
_ Ribbon blenders are exclusively meant for$? |
| A. | Blending miscible liquids |
| B. | Non-flowing powder and thin pastes |
| C. | Bath mixing |
| D. | Continuous mixing |
| Answer» C. Bath mixing | |
| 222. |
_ Which of the following is a fine crusher?$? |
| A. | Blake jaw crusher |
| B. | Gyratory crusher |
| C. | Toothed roll crusher |
| D. | Dodge jaw crusher |
| Answer» D. Dodge jaw crusher | |
| 223. |
_ In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.$? |
| A. | 35 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 224. |
_ Which of the following is the hardest material?$? |
| A. | Calcite |
| B. | Quartz |
| C. | Corundum |
| D. | Gypsum |
| Answer» D. Gypsum | |
| 225. |
_ Which of the following is not a wet classifier?$? |
| A. | Sharpies supercentrifuge |
| B. | Hydrocyclones |
| C. | Dorr Oliver rake classifier |
| D. | None of these |
| Answer» E. | |
| 226. |
_ Coal is finally pulverised to 200 mesh size for burning in boilers by a$? |
| A. | Hammer crusher |
| B. | Ball mill |
| C. | Roll crusher |
| D. | Gyratory crusher |
| Answer» C. Roll crusher | |
| 227. |
__Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about__ |
| A. | 1 to 2° |
| B. | 2 to 5° |
| C. | 5 to 10° |
| D. | 10 to 15° |
| Answer» C. 5 to 10¬¨‚àû | |
| 228. |
__Which of the following is not used as filter aid?__ |
| A. | Asbestos |
| B. | Diatomaceous earth |
| C. | Purified wood cellulose |
| D. | Rice husk |
| Answer» E. | |
| 229. |
__Tank filter (e.g., Nutsch filter) is__ |
| A. | A high pressure filter |
| B. | A continuous filter |
| C. | Used for small scale filtration work |
| D. | A leaf filter |
| Answer» D. A leaf filter | |
| 230. |
__Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?__ |
| A. | Jet mills |
| B. | Fluid energy mill |
| C. | Micronizer |
| D. | All of the above |
| Answer» E. | |
| 231. |
__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 | |
| 232. |
__Which of the following must be stored in silos and not in open yard?__ |
| A. | Coke breeze |
| B. | High V.M. bituminous coal |
| C. | Sand |
| D. | None of these |
| Answer» C. Sand | |
| 233. |
____________ mills are termed as impactors.__ |
| A. | Hammer |
| B. | Cage |
| C. | Rolling-compression |
| D. | None of these |
| Answer» B. Cage | |
| 234. |
__For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.__ |
| A. | Plate & frame |
| B. | Shell & leaf |
| C. | Sand |
| D. | Rotary vacuum |
| Answer» D. Rotary vacuum | |
| 235. |
__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. | |
| 236. |
__Which of the following is a pressure filter?__ |
| A. | Leaf filter (Moore filter) |
| B. | Plate and flame filter |
| C. | Rotary drum filter |
| D. | Sand filter |
| Answer» C. Rotary drum filter | |
| 237. |
__Choke crushing (in case of a Jaw crusher) compared to free crushing__ |
| A. | Results in increased capacity |
| B. | Consumes less power |
| C. | Consumes more power |
| D. | Both A and C |
| Answer» D. Both A and C | |
| 238. |
__Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.__ |
| A. | Clarification |
| B. | Sedimentation |
| C. | Flocculation |
| D. | Classification |
| Answer» E. | |
| 239. |
__Soft & non-abrasive materials can be made into fines by__ |
| A. | Attrition |
| B. | Compression |
| C. | Cutting |
| D. | None of these |
| Answer» B. Compression | |
| 240. |
__Filtration rate does not depend upon the__ |
| A. | Pressure drop & area of filtering surface |
| B. | Resistance of the cake & the septum |
| C. | Properties of the cake & the filtrate |
| D. | None of these |
| Answer» E. | |
| 241. |
__For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__ |
| A. | Buhrstone mill |
| B. | Ball mill |
| C. | Crushing rolls |
| D. | Hammer mill |
| Answer» B. Ball mill | |
| 242. |
__Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?__ |
| A. | Bucket conveyor |
| B. | Flight conveyor |
| C. | Screw conveyor |
| D. | Both B and C |
| Answer» E. | |
| 243. |
__Specific surface area is the surface area of a unit __________ of materials.__ |
| A. | Weight |
| B. | Volume |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 244. |
__The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__ |
| A. | ‚à ù ŒîP |
| B. | ‚à ù 1/ ŒîP |
| C. | ‚à ù ‚à öŒîP |
| D. | Independent of ΔP |
| Answer» E. | |
| 245. |
_Which of the following is a coarse crusher?$? |
| A. | Smooth roll crusher |
| B. | Toothed roll crusher |
| C. | Gyratory crusher |
| D. | Tube mill |
| Answer» D. Tube mill | |
| 246. |
_For efficient grinding, ball mills must be operated$? |
| A. | At a speed less than the critical speed |
| B. | At a speed more than the critical speed |
| C. | At a speed equal to the critical speed |
| D. | With minimum possible small balls |
| Answer» B. At a speed more than the critical speed | |
| 247. |
_What is the selectivity index, if the grade of tailings & concentrate is the same?$? |
| A. | 0 |
| B. | ‚à û |
| C. | 1 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 248. |
_200 mesh seive size corresponds to __________ microns.$? |
| A. | 24 |
| B. | 74 |
| C. | 154 |
| D. | 200 |
| Answer» C. 154 | |
| 249. |
_Trommels separate a mixture of particles depending on their$? |
| A. | Size |
| B. | Density |
| C. | Wettability |
| D. | Electrical & magnetic properties |
| Answer» B. Density | |
| 250. |
_Trommels employ __________ for screening of materials.$? |
| A. | Fibrous cloth |
| B. | Woven wire screen |
| C. | Punched plate |
| D. | None of these |
| Answer» D. None of these | |