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.
| 151. |
*/*_Ball mill is used for? |
| A. | Crushing |
| B. | Coarse grinding |
| C. | Fine grinding |
| D. | Attrition |
| Answer» D. Attrition | |
| 152. |
*/*_A compressible cake has the? |
| A. | Maximum porosity at the upstream side |
| B. | Maximum porosity at the filter medium |
| C. | Same porosity throughout the cake thickness |
| D. | None of these |
| Answer» B. Maximum porosity at the filter medium | |
| 153. |
*/*___________ is a cohesive solid.? |
| A. | Wheat |
| B. | Sand |
| C. | Wet clay |
| D. | None of these |
| Answer» D. None of these | |
| 154. |
%_Pick out the correct statement:_% |
| A. | Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products |
| B. | The operating cost of shaking screen is more than that of a vibrating screen |
| C. | Screen capacity does not depend upon the specific gravity of the minerals |
| D. | Asphalt is best crushed using toothed roll crusher |
| Answer» B. The operating cost of shaking screen is more than that of a vibrating screen | |
| 155. |
%_For coarse reduction of hard solids, use_% |
| A. | Impact |
| B. | Attrition |
| C. | Compression |
| D. | Cutting |
| Answer» D. Cutting | |
| 156. |
%_What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?_% |
| A. | 16° |
| B. | 32° |
| C. | 40° |
| D. | 46° |
| Answer» C. 40¬¨‚àû | |
| 157. |
%_For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?_% |
| A. | Kozney-Karman equation |
| B. | Leva |
| C. | Blake-Plummer equation |
| D. | None of these |
| Answer» B. Leva | |
| 158. |
%_Colloidal mills are used for __________ grinding._% |
| A. | Coarse |
| B. | Intermediate |
| C. | Fine |
| D. | Ultrafine |
| Answer» E. | |
| 159. |
%_Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)_% |
| A. | 0.5 D |
| B. | D |
| C. | 1.5 D |
| D. | 2 D |
| Answer» C. 1.5 D | |
| 160. |
%_Which of the following is a vacuum filter?_% |
| A. | Filter press |
| B. | Rotary disc filter |
| C. | Batch basket centrifuge |
| D. | Tank filter (Nutsch filter) |
| Answer» C. Batch basket centrifuge | |
| 161. |
%_Rittinger's crushing law states that_% |
| A. | Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product |
| B. | Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product |
| C. | Work required in crushing is proportional to the new surface created |
| D. | For a given machine and feed, crushing efficiency is dependent on the size of the feed & product |
| Answer» D. For a given machine and feed, crushing efficiency is dependent on the size of the feed & product | |
| 162. |
%_Sphericity of raschig ring (whose length and diameter are equal) is_% |
| A. | >1 |
| B. | <1 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 163. |
%_The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle)._% |
| A. | 6/D.p |
| B. | 2/D.p |
| C. | 4/D.p |
| D. | 12/D.p |
| Answer» B. 2/D.p | |
| 164. |
%_Separation of materials of the same density based on their sizes by using then-different rates of flow is called_% |
| A. | Sorting |
| B. | Sizing |
| C. | Flocculation |
| D. | Elutriation |
| Answer» C. Flocculation | |
| 165. |
%_Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens._% |
| A. | Jaw crusher |
| B. | Hammer crusher |
| C. | Ball mill |
| D. | Tube mill |
| Answer» C. Ball mill | |
| 166. |
%_A compressible cake has the_% |
| A. | Maximum porosity at the upstream side |
| B. | Maximum porosity at the filter medium |
| C. | Same porosity throughout the cake thickness |
| D. | None of these |
| Answer» B. Maximum porosity at the filter medium | |
| 167. |
%___________ is a cohesive solid._% |
| A. | Wheat |
| B. | Sand |
| C. | Wet clay |
| D. | None of these |
| Answer» D. None of these | |
| 168. |
%_Supporting legs of a plate and frame filter is normally made of_% |
| A. | Stainless steel |
| B. | Cast iron |
| C. | High speed steel |
| D. | Wooden plank |
| Answer» C. High speed steel | |
| 169. |
%_The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is_% |
| A. | 6.35 kWh/ton |
| B. | 9.0 kWh/ton |
| C. | 18 kWh/ton |
| D. | 25.4 kWh/ton |
| Answer» D. 25.4 kWh/ton | |
| 170. |
%_In case of grinding in a ball mill_% |
| A. | Wet grinding achieves a finer product size than dry grinding |
| B. | Its capacity decreases with increasing fineness of the products |
| C. | Grinding cost and power requirement increases with increasing fineness of the products |
| D. | All of the above |
| Answer» E. | |
| 171. |
%_Carbon black is pulverised in a_% |
| A. | Hammer crusher |
| B. | Ball mill |
| C. | Roll crusher |
| D. | Gyratory crusher |
| Answer» C. Roll crusher | |
| 172. |
%_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 | |
| 173. |
_ Mixer used for rubber compounding is$? |
| A. | Mixer-extruder |
| B. | Banbury internal mixer |
| C. | Muller mixer |
| D. | Pug mill |
| Answer» C. Muller mixer | |
| 174. |
_ Maximum size reduction in a fluid energy mill is achieved by$? |
| A. | Compression |
| B. | Interparticle attrition |
| C. | Cutting |
| D. | Impact |
| Answer» C. Cutting | |
| 175. |
_ The most common filter aid is$? |
| A. | Diatomaceous earth |
| B. | Calcium silicate |
| C. | Sodium carbonate |
| D. | Silica gel |
| Answer» B. Calcium silicate | |
| 176. |
_ Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called$? |
| A. | Classification |
| B. | Froth floatation |
| C. | Thickening |
| D. | Clarification |
| Answer» B. Froth floatation | |
| 177. |
_ Pick out the wrong statement pertaining to the roll crushers.$? |
| A. | Maximum feed size determines the required roll diameter |
| B. | For hard material's crushing, the reduction ratio should not exceed 4 |
| C. | Both the rolls run necessarily at the same speed |
| D. | Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced |
| Answer» D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced | |
| 178. |
_ Screw conveyors are$? |
| A. | Run at very high rpm |
| B. | Suitable for sticky materials |
| C. | Suitable for highly abrasive materials |
| D. | All of the above |
| Answer» C. Suitable for highly abrasive materials | |
| 179. |
_ The work index in Bond's law for crushing of solids has the following dimensions$? |
| A. | No units (dimensionless) |
| B. | KWh/ton |
| C. | KW/ton |
| D. | KWh.m1/2/ton |
| Answer» C. KW/ton | |
| 180. |
_ If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by$? |
| A. | Φs = 6 Vp/dp sp |
| B. | Φs = Vp/dp sp |
| C. | Φs = 6 dp Sp/Vp |
| D. | Φs = dp Sp/Vp |
| Answer» B. ≈í¬∂s = Vp/dp sp | |
| 181. |
_ Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.$? |
| A. | Apron |
| B. | Belt |
| C. | Screw |
| D. | Flight |
| Answer» B. Belt | |
| 182. |
_ Gravity stamp mill is meant for the __________ crushing.$? |
| A. | Primary |
| B. | Intermediate |
| C. | Fine |
| D. | Ultrafine |
| Answer» D. Ultrafine | |
| 183. |
_ Limestone is normally crushed in a$? |
| A. | Roll crusher |
| B. | Hammer crusher |
| C. | Ball mill |
| D. | Tube mill |
| Answer» C. Ball mill | |
| 184. |
_ Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.$? |
| A. | Blake jaw |
| B. | Toothed roll |
| C. | Gyratory |
| D. | None of these |
| Answer» C. Gyratory | |
| 185. |
_ Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?$? |
| A. | Parabola |
| B. | Straight line |
| C. | Hyperbola |
| D. | Exponential curve |
| Answer» B. Straight line | |
| 186. |
_ Energy requirement (per unit mass of material crushed/ground) is highest for$? |
| A. | Jaw crusher |
| B. | Rod mill |
| C. | Ball mill |
| D. | Fluid energy mill |
| Answer» E. | |
| 187. |
_ Chance process is used for the$? |
| A. | Cleaning of coal |
| B. | Concentration of iron ore |
| C. | Concentration of pyrites |
| D. | Water treatment |
| Answer» B. Concentration of iron ore | |
| 188. |
_ Ball mill is used for$? |
| A. | Crushing |
| B. | Coarse grinding |
| C. | Fine grinding |
| D. | Attrition |
| Answer» D. Attrition | |
| 189. |
_ Tabular bowl centrifuges as compared to disk bowl centrifuges$? |
| A. | Operate at higher speed |
| B. | Employ bowl of larger diameter |
| C. | Can not be operated under pressure/vacuum |
| D. | Can't be used for separation of fine suspended solids from a liquid |
| Answer» B. Employ bowl of larger diameter | |
| 190. |
_ Dispersion of a gas through liquid is done by using a$? |
| A. | Sparger |
| B. | Kneader |
| C. | Masticator |
| D. | None of these |
| Answer» B. Kneader | |
| 191. |
_ Filtration of water in a paper mill is done by a/an __________ filter.$? |
| A. | Open sand |
| B. | Plate and frame |
| C. | Vacuum leaf |
| D. | Sparkler |
| Answer» B. Plate and frame | |
| 192. |
_ For spheres, volume shape factor is given by$? |
| A. | π(=A/D²) |
| B. | 2π(=2A/D²) |
| C. | π/6(=V/D³) |
| D. | AD/V |
| Answer» D. AD/V | |
| 193. |
_ The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a$? |
| A. | Boundary mixer |
| B. | Propeller agitator |
| C. | Sharpies centrifuge |
| D. | None of these |
| Answer» B. Propeller agitator | |
| 194. |
_ The unit of filter medium resistance is$? |
| A. | Cm⁻¹ |
| B. | Gm/cm⁻¹ |
| C. | Cm/gm⁻¹ |
| D. | Gm⁻¹ |
| Answer» B. Gm/cm‚Äö√Ö¬™¬¨œÄ | |
| 195. |
_ Cumulative analysis for determining surface is more precise than differential analysis, because of the$? |
| A. | Assumption that all particles in a single fraction are equal in size |
| B. | Fact that screening is more effective |
| C. | Assumption that all particles in a single fraction are equal in size, is not needed |
| D. | None of these |
| Answer» D. None of these | |
| 196. |
_ Which of the following is not an ultrafine grinder (colloid mill)?$? |
| 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 | |
| 197. |
_ Cement clinker is reduced to fine size by a$? |
| A. | Roll crusher |
| B. | Ball mill |
| C. | Tube mill |
| D. | Hammer mill |
| Answer» D. Hammer mill | |
| 198. |
_ Highly viscous liquids & pastes are agitated by$? |
| A. | Propellers |
| B. | Turbine agitators |
| C. | Multiple blade paddles |
| D. | None of these |
| Answer» D. None of these | |
| 199. |
_ For a non-spherical particle, the sphericity$? |
| A. | Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle |
| B. | Has the dimension of length |
| C. | Is always less than 1 |
| D. | Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle |
| Answer» B. Has the dimension of length | |
| 200. |
_ For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.$? |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» D. 75 | |