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.
| 151. |
Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________? |
| A. | Tube mill |
| B. | Ball mill |
| C. | Jaw crusher |
| D. | Jet pulveriser |
| Answer» D. Jet pulveriser | |
| 152. |
Ore concentration by jigging is based on the difference in the ______________ of the particles? |
| A. | Specific gravities |
| B. | Wettability |
| C. | Shape |
| D. | None of these |
| Answer» B. Wettability | |
| 153. |
Optimum ratio of operating speed to critical speed of a trommel is_____________________? |
| A. | 0.33-0.45 |
| B. | 1.33-1.45 |
| C. | 0.5-2 |
| D. | 1.5-2.5 |
| Answer» B. 1.33-1.45 | |
| 154. |
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 . ρ/Vp | |
| 155. |
Moore filter is a ______________ filter ? |
| A. | Leaf |
| B. | Press |
| C. | Rotary |
| D. | Sand |
| Answer» B. Press | |
| 156. |
Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a__________________? |
| A. | Pug mill |
| B. | Mixer-extruder |
| C. | Banbury mixer |
| D. | Muller mixer |
| Answer» B. Mixer-extruder | |
| 157. |
Moisture can be removed from lubricating oil using_________________? |
| A. | Tubular centrifuge |
| B. | Clarifier |
| C. | Sparkler filter |
| D. | Vacuum leaf filter |
| Answer» B. Clarifier | |
| 158. |
Mixing of plastic solids is generally facilitated by___________________? |
| A. | Dispersion |
| B. | Mastication |
| C. | Kneading |
| D. | None of these |
| Answer» D. None of these | |
| 159. |
Mixing of light fine powder such as insecticides is done by____________________? |
| A. | Banbury mixer |
| B. | Pug mill |
| C. | Impact wheels |
| D. | Kneader |
| Answer» D. Kneader | |
| 160. |
Mixing mechanism employed in a pan mixer is by ________________? |
| A. | Mulling |
| B. | Kneading |
| C. | Dispersion |
| D. | None of these |
| Answer» B. Kneading | |
| 161. |
Mixer used for rubber compounding is__________________? |
| A. | mixer-extruder |
| B. | Banbury internal mixer |
| C. | Muller mixer |
| D. | Pug mill |
| Answer» C. Muller mixer | |
| 162. |
_______________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution? |
| A. | Tumbler |
| B. | Banbury |
| C. | Muller |
| D. | Ribbon blender |
| Answer» C. Muller | |
| 163. |
____________ mills fall in the category of tumbling mills ? |
| A. | Ball and pebble |
| B. | Rod and tube |
| C. | Compartment |
| D. | All A., B. & C. |
| Answer» E. | |
| 164. |
_____________ mills are termed as disintegrators? |
| A. | Cage |
| B. | Compartment |
| C. | Pebble |
| D. | All tumbling |
| Answer» B. Compartment | |
| 165. |
_____________ mills are termed as impactors? |
| A. | Hammer |
| B. | Cage |
| C. | Rolling-compression |
| D. | None of these |
| Answer» B. Cage | |
| 166. |
_______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?_x005F_x000D_vegetable products. |
| A. | Buhrstone |
| B. | Roller |
| C. | Attrition |
| D. | Pebble |
| Answer» E. | |
| 167. |
______________ mill is not a revolving mill ? |
| A. | Pebble |
| B. | Compartment |
| C. | Cage |
| D. | Tube |
| Answer» D. Tube | |
| 168. |
_______________ mill is normally used for grinding of talc? |
| A. | Tube |
| B. | Compartment |
| C. | Ring-roll |
| D. | Pebble |
| Answer» D. Pebble | |
| 169. |
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 | |
| 170. |
Mesh indicates the number of holes per_________________? |
| A. | Square inch |
| B. | Linear inch |
| C. | Square foot |
| D. | Linear foot |
| Answer» C. Square foot | |
| 171. |
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. | |
| 172. |
______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)? |
| A. | Mass |
| B. | Volume |
| C. | Arithmetic |
| D. | Volume surface |
| Answer» C. Arithmetic | |
| 173. |
Maximum size reduction in a fluid energy mill is achieved by___________________? |
| A. | Compression |
| B. | Interparticle attrition |
| C. | Cutting |
| D. | Impact |
| Answer» C. Cutting | |
| 174. |
Maximum size reduction in a ball mill is done by the, ______________ action? |
| A. | Attrition |
| B. | Compression |
| C. | Impact |
| D. | Cutting |
| Answer» D. Cutting | |
| 175. |
Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________? |
| A. | M ∝ √D |
| B. | M ∝ D2 |
| C. | M ∝ D3 |
| D. | M ∝ D |
| Answer» D. M ∝ D | |
| 176. |
Limestone is normally crushed in a _____________________? |
| A. | Roll crusher |
| B. | Hammer crusher |
| C. | Ball mill |
| D. | Tube mill |
| Answer» C. Ball mill | |
| 177. |
Length/diameter ratio of a ball mill is __________________ ? |
| A. | 1.5 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 178. |
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________? |
| A. | > 10 |
| B. | < 10 |
| C. | > 100 |
| D. | < 100 |
| Answer» C. > 100 | |
| 179. |
Kick’s law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick’s constant is_________________? |
| A. | kW. sec/kg |
| B. | kWh/kg |
| C. | kWh/sec. kg |
| D. | kg/sec |
| Answer» B. kWh/kg | |
| 180. |
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 | |
| 181. |
______________ is used for producing a thick suspension from a thin slurry? |
| A. | Cartridge filter |
| B. | Rotary drum vacuum filter |
| C. | Pressure filter thickener |
| D. | Plate and frame filter press |
| Answer» D. Plate and frame filter press | |
| 182. |
_____________ is the most suitable for compounding rubber and plastic solids ? |
| A. | Banbury mixer |
| B. | Pan mixer |
| C. | Pug mill |
| D. | Charge can mixer |
| Answer» B. Pan mixer | |
| 183. |
_____________ is the most commonly used ‘filter aid’? |
| A. | Diatomaceous earth |
| B. | Fuller’s earth |
| C. | Vermiculite |
| D. | Semi-plastic clay |
| Answer» B. Fuller’s earth | |
| 184. |
_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals? |
| A. | Separation efficiency |
| B. | Selectivity index |
| C. | Concentration ratio |
| D. | None of these |
| Answer» C. Concentration ratio | |
| 185. |
_______________ is a cohesive solid ? |
| A. | Wheat |
| B. | Sand |
| C. | Wet clay |
| D. | None of these |
| Answer» D. None of these | |
| 186. |
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. | |
| 187. |
increasing the capacity of a screen _______________ the screen effectiveness? |
| A. | Decreases |
| B. | Increases |
| C. | Does not effect |
| D. | None of these |
| Answer» B. Increases | |
| 188. |
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 | |
| 189. |
In the cyclone separator used for separation of dust from dust laden gas, the gas ? |
| A. | Enters the cyclone from the top |
| B. | Is admitted tangentially at high velocity |
| C. | Develops a helical motion inside the chamber |
| D. | Both B. and C. |
| Answer» E. | |
| 190. |
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 | |
| 191. |
In froth floatation, chemical agent added to cause air adherence is called___________________? |
| A. | Collector |
| B. | Frother |
| C. | Modifier |
| D. | Activator |
| Answer» B. Frother | |
| 192. |
In filtration, the use of ‘filter aid’ helps in__________________? |
| A. | Reducing the filtration pressure |
| B. | Accelerating the rate of filtration |
| C. | Deplugging the filter medium |
| D. | Enhancing the cake porosity in case of a dense impermeable cake |
| Answer» D. Enhancing the cake porosity in case of a dense impermeable cake | |
| 193. |
In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________? |
| A. | Square root of the velocity |
| B. | Square of the viscosity |
| C. | Filtration time only |
| D. | Washing time only |
| Answer» B. Square of the viscosity | |
| 194. |
In constant pressure filtration ? |
| A. | Resistance decreases with time |
| B. | Rate of filtration is constant |
| C. | Rate of filtration increases with time |
| D. | Rate of filtration decreases with time |
| Answer» E. | |
| 195. |
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced? |
| A. | Concentrate |
| B. | Tailing |
| C. | Middling |
| D. | None of these |
| Answer» D. None of these | |
| 196. |
In closed circuit grinding as compared to open circuit grinding, the_________________? |
| A. | Specific surface of product is more |
| B. | Product has lesser size uniformity |
| C. | Production rate at a given limiting size is lower |
| D. | Operation is economical |
| Answer» E. | |
| 197. |
In classification, particles are said to be equal settling, if they have the same terminal velocities in the_______________? |
| A. | Different fluids |
| B. | Same fluid |
| C. | Same field of force |
| D. | Both B. and C. |
| Answer» E. | |
| 198. |
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 A., B. and C |
| Answer» E. | |
| 199. |
In case of a revolving mill, wet grinding compared to dry grinding__________________? |
| A. | Requires more energy |
| B. | Has less capacity |
| C. | Complicates handling & classification of the product |
| D. | None of these |
| Answer» E. | |
| 200. |
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 | |