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.
| 401. |
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 (a), (b) and (c) |
| Answer» E. | |
| 402. |
As particle size is reduced |
| A. | screening becomes progressively more difficult. |
| B. | screening becomes progressively easier. |
| C. | capacity and effectiveness of the screen is increased. |
| D. | none of these. |
| Answer» B. screening becomes progressively easier. | |
| 403. |
A cottrel precipitator makes use of the __________ for dusty air cleaning. |
| A. | electric spark |
| B. | corrona discharge |
| C. | alternating current |
| D. | none of these. |
| Answer» C. alternating current | |
| 404. |
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 | |
| 405. |
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 | |
| 406. |
__________ conveyors are also called scrapers. |
| A. | Apron |
| B. | Screw |
| C. | Helical flight |
| D. | both (b) & (c) |
| Answer» E. | |
| 407. |
Carbon black is pulverised in a |
| A. | hammer crusher |
| B. | ball mill |
| C. | roll crusher |
| D. | gyratory crusher |
| Answer» C. roll crusher | |
| 408. |
Length/diameter ratio of a ball mill is |
| A. | 1.5 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 409. |
Pine oil and cresylic acid are used as __________ in the froth floatation process. |
| A. | frother |
| B. | collector |
| C. | depressor |
| D. | conditioner |
| Answer» B. collector | |
| 410. |
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 | |
| 411. |
Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the |
| A. | coagulation |
| B. | flocculation |
| C. | sedimentation |
| D. | clarification |
| Answer» D. clarification | |
| 412. |
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing. |
| A. | secondary |
| B. | fine |
| C. | primary |
| D. | ultrafine |
| Answer» D. ultrafine | |
| 413. |
The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt. |
| A. | speed |
| B. | thickness |
| C. | length |
| D. | none of these |
| Answer» B. thickness | |
| 414. |
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency. |
| A. | Cast iron |
| B. | Minimum size |
| C. | Maximum size |
| D. | Elliptical |
| Answer» C. Maximum size | |
| 415. |
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 | |
| 416. |
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 | |
| 417. |
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is |
| A. | 4 |
| B. | 43556 |
| C. | 1 |
| D. | 43497 |
| Answer» C. 1 | |
| 418. |
Ball mills and tube mills with flint or porcelain balls are used for size reduction of |
| A. | asbestos |
| B. | rubber |
| C. | non-metallic ores |
| D. | limestone |
| Answer» D. limestone | |
| 419. |
Bucket elevators are not suitable for the vertical lifting of __________ materials. |
| A. | fine (e.g. - 200 mesh size coal) |
| B. | sticky (e.g. clay paste) |
| C. | small lumpy (e.g. grains and sand) |
| D. | free flowing |
| Answer» C. small lumpy (e.g. grains and sand) | |
| 420. |
For classification of potable (drinking) water, we use a __________ filter. |
| A. | gravity sand |
| B. | plate and frame |
| C. | vacuum leaf |
| D. | rotary vacuum |
| Answer» B. plate and frame | |
| 421. |
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. | |
| 422. |
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 | |
| 423. |
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. | |
| 424. |
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively. |
| A. | 200°C and 5 atm. |
| B. | 1000°C and 10 atm. |
| C. | 500°C and 50 atm. |
| D. | 1000°C and 500 atm. |
| Answer» C. 500¬∞C and 50 atm. | |
| 425. |
Production rate __________ with increased fineness, with a given energy input to the size reduction machine. |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | may increase or decrease; depends on the machine |
| Answer» B. increases | |
| 426. |
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. | |
| 427. |
The most common filter aid is |
| A. | diatomaceous earth |
| B. | calcium silicate |
| C. | sodium carbonate |
| D. | silica gel |
| Answer» B. calcium silicate | |
| 428. |
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 . œÅ/Vp | |
| 429. |
In a roll crusher, both the rolls |
| A. | have the same diameter. |
| B. | are rotated towards each other. |
| C. | run either at the same or different speeds. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 430. |
A __________ mixer resembles a ball mill without balls. |
| A. | banbery |
| B. | pug mill |
| C. | tumbling |
| D. | pan |
| Answer» D. pan | |
| 431. |
__________ centrifuge is normally used in sugar mills. |
| A. | Tubular bowl |
| B. | Disc-bowl |
| C. | Suspended batch basket |
| D. | Perforated horizontal basket continuous |
| Answer» D. Perforated horizontal basket continuous | |
| 432. |
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 | |
| 433. |
A tube mill compared to a ball mill |
| A. | has a higher length/diameter ratio. |
| B. | produces a coarser product. |
| C. | has a higher diameter/length ratio. |
| D. | uses much larger balls. |
| Answer» B. produces a coarser product. | |
| 434. |
Stamp mills are generally used for crushing |
| A. | iron ores |
| B. | gold ores |
| C. | talc |
| D. | diamond |
| Answer» C. talc | |
| 435. |
Wheat is ground into flour in a |
| A. | hammer crusher |
| B. | roller crusher |
| C. | impact mill |
| D. | fluid energy mill |
| Answer» C. impact mill | |
| 436. |
Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill. |
| A. | impact |
| B. | roll |
| C. | vibratory |
| D. | none of these |
| Answer» B. roll | |
| 437. |
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. | |
| 438. |
Cyclones are used primarily for separating |
| A. | solids |
| B. | solids from fluids |
| C. | liquids |
| D. | solids from solids |
| Answer» C. liquids | |
| 439. |
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. | |
| 440. |
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 | |
| 441. |
__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution. |
| A. | Tumbler |
| B. | Banbery |
| C. | Muller |
| D. | Rubbon blender |
| Answer» C. Muller | |
| 442. |
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 | |
| 443. |
Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)$ |
| A. | S |
| B. | 1/R |
| C. | 1/μ |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 444. |
Separation of solid particles based on their densities is called |
| A. | sizing |
| B. | sorting |
| C. | clarification |
| D. | dispersion |
| Answer» C. clarification | |
| 445. |
The sphericity of a cylinder of 1 mm diameter and length 3 mm is |
| A. | 0.9 |
| B. | 0.78 |
| C. | 0.6 |
| D. | 0.5 |
| Answer» B. 0.78 | |
| 446. |
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream. |
| A. | thickener |
| B. | classifier |
| C. | strainer |
| D. | clarifier |
| Answer» D. clarifier | |
| 447. |
Balls for ball mills are never made of |
| A. | forged/cast steel |
| B. | lead |
| C. | cast iron |
| D. | alloy steel |
| Answer» C. cast iron | |
| 448. |
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 | |
| 449. |
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. | |
| 450. |
Soft & non-abrasive materials can be made into fines by |
| A. | attrition |
| B. | compression |
| C. | cutting |
| D. | none of these |
| Answer» B. compression | |