MCQOPTIONS
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MCQOPTIONS
This section includes 552 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. |
To remove dirt from the flowing fluid, we use a |
| A. | coagulant |
| B. | gravity settler |
| C. | strains |
| D. | clarifier |
| Answer» D. clarifier | |
| 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. |
Moore filter is a __________ filter. |
| A. | leaf |
| B. | press |
| C. | rotary |
| D. | sand |
| Answer» B. press | |
| 204. |
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-1 | |
| 205. |
Helical screw agitator is used for |
| A. | mixing highly viscous pastes. |
| B. | blending immiscible liquids. |
| C. | mixing liquids at very high temperature (> 250 °C). |
| D. | none of these. |
| Answer» B. blending immiscible liquids. | |
| 206. |
In paint industries, blending of light paste is done by using a |
| A. | masticator |
| B. | charge can mixer |
| C. | kneader |
| D. | none of these |
| Answer» C. kneader | |
| 207. |
The speed of a rotary drum vacuum filter may be about __________ rpm. |
| A. | 1 |
| B. | 50 |
| C. | 100 |
| D. | 500 |
| Answer» B. 50 | |
| 208. |
Fluid medium used in the classification technique of mineral beneficiation is |
| A. | air |
| B. | water |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 209. |
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) | |
| 210. |
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 211. |
In froth floatation, chemical agent added to cause air adherence is called |
| A. | collector |
| B. | frother |
| C. | modifier |
| D. | activator |
| Answer» B. frother | |
| 212. |
Grinding characteristic of a material is given by its |
| A. | HGI |
| B. | angle of repose |
| C. | shatter index |
| D. | abrasion index. |
| Answer» B. angle of repose | |
| 213. |
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. | |
| 214. |
increasing the capacity of a screen __________ the screen effectiveness. |
| A. | decreases. |
| B. | increases |
| C. | does not effect |
| D. | none of these |
| Answer» B. increases | |
| 215. |
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 | |
| 216. |
Wet seiving is employed, when the product contains __________ materials. |
| A. | abrasive |
| B. | large quantity of very fine |
| C. | coarse |
| D. | non-sticky |
| Answer» C. coarse | |
| 217. |
Size measurement of ultrafine particles can be best expressed in terms of |
| A. | centimetre |
| B. | screen size |
| C. | micron |
| D. | surface area per unit mass |
| Answer» E. | |
| 218. |
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. | |
| 219. |
Work index is defined as the |
| A. | gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen. |
| B. | energy needed to crush one tonne of feed to 200 microns. |
| C. | energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen. |
| D. | energy needed to crush one ton of feed to 100 microns. |
| Answer» B. energy needed to crush one tonne of feed to 200 microns. | |
| 220. |
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) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 221. |
Shape factor for a cylinder whose length equals its diameter is |
| A. | 1.5 |
| B. | 0.5 |
| C. | 1 |
| D. | 2 |
| Answer» B. 0.5 | |
| 222. |
Which of the following is the hardest material ? |
| A. | Calcite |
| B. | Quartz |
| C. | Corundum |
| D. | Gypsum |
| Answer» D. Gypsum | |
| 223. |
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration |
| A. | at time zero. |
| B. | at the end of filtration. |
| C. | when half the filtrate has been obtained. |
| D. | at the end of filtration, but decreases with time subsequently. |
| Answer» C. when half the filtrate has been obtained. | |
| 224. |
Size reduction mechanism used in Jaw crushers is |
| A. | attrition |
| B. | compression |
| C. | cutting |
| D. | impact |
| Answer» C. cutting | |
| 225. |
Raw materials are charged in the iron blast furnace using |
| A. | bucket elevator |
| B. | skip hoist |
| C. | screw conveyor |
| D. | none of these |
| Answer» C. screw conveyor | |
| 226. |
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 | |
| 227. |
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ? |
| A. | Wet grinding in low viscous suspension. |
| B. | Wet grinding in high viscous suspension. |
| C. | Dry grinding of large particles (upto 1.25 cms). |
| D. | Dry grindng of large particles in un-baffed mills. |
| Answer» E. | |
| 228. |
Dispersion of a gas through liquid is done by using a |
| A. | sparger |
| B. | kneader |
| C. | masticator |
| D. | none of these |
| Answer» B. kneader | |
| 229. |
__________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc. |
| A. | Flight |
| B. | Screw |
| C. | Drag |
| D. | Belt |
| Answer» B. Screw | |
| 230. |
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 | |
| 231. |
__________ is a cohesive solid. |
| A. | Wheat |
| B. | Sand |
| C. | Wet clay |
| D. | none of these |
| Answer» D. none of these | |
| 232. |
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are |
| A. | carbonates |
| B. | sulphates |
| C. | silicates & phosphates |
| D. | bi-carbonates |
| Answer» D. bi-carbonates | |
| 233. |
Sphericity of pulverised coal is |
| A. | 1 |
| B. | <1 |
| C. | >1 |
| D. | ‚àû |
| Answer» C. >1 | |
| 234. |
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 (a), (b) & (c) |
| Answer» E. | |
| 235. |
Grinding efficiency of a ball mill is of the order of __________ percent. |
| A. | 43586 |
| B. | 40-50 |
| C. | 75-80 |
| D. | 90-95 |
| Answer» B. 40-50 | |
| 236. |
__________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials. |
| A. | Bucket |
| B. | Belt |
| C. | Screw |
| D. | Apron |
| Answer» C. Screw | |
| 237. |
__________ centrifuge is the most suitable for separation of non-friable crystals. |
| A. | Tubular bowl |
| B. | Disc-bowl |
| C. | Perforated horizontal basket continuous |
| D. | Suspended batch basket |
| Answer» D. Suspended batch basket | |
| 238. |
In case of a hammer crusher, the final product size depends on the |
| A. | feed rate. |
| B. | rotor speed. |
| C. | clearance between hammer & grinding plates. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 239. |
Ball mill is used for |
| A. | crushing |
| B. | coarse grinding |
| C. | fine grinding |
| D. | attrition |
| Answer» D. attrition | |
| 240. |
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration. |
| A. | rate |
| B. | pressure |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 241. |
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores. |
| A. | classification |
| B. | tabling |
| C. | jigging |
| D. | froth floatation |
| Answer» E. | |
| 242. |
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. | |
| 243. |
Which of the following may prove unsuitable for filtering volatile liquids ? |
| A. | Pressure filter |
| B. | Gravity filter |
| C. | Centrifugal filter |
| D. | Vacuum filter |
| Answer» E. | |
| 244. |
Colloid mills achieve size reduction mainly by |
| A. | impact |
| B. | attrition |
| C. | cutting |
| D. | compression |
| Answer» C. cutting | |
| 245. |
Which of the following is not a cutting machine? |
| A. | Dicers |
| B. | Knife cutters |
| C. | Slitters |
| D. | Tube mills |
| Answer» E. | |
| 246. |
Compressibility co-efficient for an absolutely compressible cake is |
| A. | 0 |
| B. | 1 |
| C. | 0 to 1 |
| D. | ‚àû |
| Answer» C. 0 to 1 | |
| 247. |
Rod mills employed for grinding |
| A. | employ a steel shell having L/D ratio of 1.5 to 3.0. |
| B. | is useful for handling sticky materials. |
| C. | employ steel rods of 2-12 cms diameter extending over full length of the mill. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 248. |
Percentage of drum submerged in the slurry in case of rotary drum filter is |
| A. | 3 |
| B. | 30 |
| C. | 85 |
| D. | 25 |
| Answer» C. 85 | |
| 249. |
The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number. |
| A. | Reynold's |
| B. | Froude |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 250. |
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ? |
| A. | 0.5 |
| B. | 1 |
| C. | 2.76 |
| D. | 0.66 |
| Answer» E. | |