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.
| 301. |
____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials? |
| A. | Bucket |
| B. | Belt |
| C. | Screw |
| D. | Apron |
| Answer» C. Screw | |
| 302. |
Compressibility co-efficient for an absolutely compressible cake is_______________? |
| A. | 0 |
| B. | 1 |
| C. | 0 to 1 |
| D. | ∞ |
| Answer» C. 0 to 1 | |
| 303. |
Colloidal mills are used for ______________ grinding? |
| A. | Coarse |
| B. | Intermediate |
| C. | Fine |
| D. | Ultrafine |
| Answer» E. | |
| 304. |
Colloid mills achieve size reduction mainly by___________________? |
| A. | Impact |
| B. | Attrition |
| C. | Cutting |
| D. | Compression |
| Answer» C. Cutting | |
| 305. |
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 | |
| 306. |
Close circuit grinding by a ball mill with air sweeping employs a _______________________? |
| A. | Classifier |
| B. | Cyclone separator between mill & classifier |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 307. |
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. | |
| 308. |
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 | |
| 309. |
_______________ 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 | |
| 310. |
_____________ 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 | |
| 311. |
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 | |
| 312. |
Cartridge filters are termed as ‘edge’ filters, because of the fact that the_________________? |
| A. | Disks have very sharp edge |
| B. | Solids are not deposited at the edge of the disk |
| C. | Bulk of the solids are removed at the periphery of the disks |
| D. | None of these |
| Answer» D. None of these | |
| 313. |
Carbon black is pulverised in a_______________? |
| A. | Hammer crusher |
| B. | Ball mill |
| C. | Roll crusher |
| D. | Gyratory crusher |
| Answer» C. Roll crusher | |
| 314. |
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ? |
| A. | 3.6 W.D.V.ρ |
| B. | 3.6 W.D.V |
| C. | 3.6 W.V.ρ |
| D. | 3.6 D.V.ρ |
| Answer» B. 3.6 W.D.V | |
| 315. |
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ? |
| A. | 0.01 L.S |
| B. | 0.087 L.S |
| C. | L.S |
| D. | L.S/0.087 |
| Answer» C. L.S | |
| 316. |
Cake resistance is___________________? |
| A. | Important in the beginning of filtration |
| B. | Decreased with the time of filtration |
| C. | Independent of pressure drop |
| D. | None of these |
| Answer» E. | |
| 317. |
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) | |
| 318. |
Bond crushing law_________________? |
| A. | Calls for relatively less energy for the smaller product particles, than does the Rittinger law |
| B. | Is less realistic in estimating the power requirements of commercial crushers |
| C. | States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of t |
| D. | States that the work required for the crushing is proportional to the new surface created |
| Answer» B. Is less realistic in estimating the power requirements of commercial crushers | |
| 319. |
Basic slag is not ground in_________________? |
| A. | Jaw crushers |
| B. | Ball mills |
| C. | Compartment mills |
| D. | Tube mills |
| Answer» B. Ball mills | |
| 320. |
Balls for ball mills are never made of_________________? |
| A. | Forged/cast steel |
| B. | Lead |
| C. | Cast iron |
| D. | Alloy steel |
| Answer» C. Cast iron | |
| 321. |
______________________ 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 | |
| 322. |
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 | |
| 323. |
Ball mill is used for__________________? |
| A. | Crushing |
| B. | Coarse grinding |
| C. | Fine grinding |
| D. | Attrition |
| Answer» D. Attrition | |
| 324. |
_____________________ baffles are provided in ball mills ? |
| A. | Horizontal |
| B. | No |
| C. | Only two |
| D. | None of these |
| Answer» B. No | |
| 325. |
At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ? |
| A. | Po ∝ Re-1.0 |
| B. | Po ∝ Re0.0 |
| C. | Po ∝ Re0.5 |
| D. | Po ∝ Re1.0 |
| Answer» C. Po ∝ Re0.5 | |
| 326. |
As the product becomes finer, the energy required for grinding___________________? |
| A. | Decreases |
| B. | Increases |
| C. | Is same as for coarser grinding |
| D. | Is 1.5 times that for coarser grinding |
| Answer» C. Is same as for coarser grinding | |
| 327. |
As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ? |
| A. | LS |
| B. | 93 LS |
| C. | 250 LS |
| D. | √(LS) |
| Answer» C. 250 LS | |
| 328. |
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 | |
| 329. |
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them ? |
| A. | Jaw crusher, Ball mill, Fluid energy mill |
| B. | Ball mill, Jaw crusher, Fluid energy mill |
| C. | Fluid energy mill, Jaw crusher, Ball mill |
| D. | Fluid energy mill, Ball mill, Jaw crusher |
| Answer» B. Ball mill, Jaw crusher, Fluid energy mill | |
| 330. |
______________ are used for the separation of coarse particles from a slurry of fine particles? |
| A. | Thickeners |
| B. | Classifiers |
| C. | Hydrocyclones |
| D. | Decanters |
| Answer» C. Hydrocyclones | |
| 331. |
_____________ are mixed using ribbon blenders ? |
| A. | Lumpy solids and low viscosity liquids |
| B. | Dry powders |
| C. | High viscosity liquids |
| D. | Thick pastes |
| Answer» C. High viscosity liquids | |
| 332. |
Apron conveyors are used for ___________________ ? |
| A. | Heavy loads & short runs |
| B. | Small loads & long runs |
| C. | Heavy loads & long runs |
| D. | None of these |
| Answer» B. Small loads & long runs | |
| 333. |
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 | |
| 334. |
All resistances during washing of cake _____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | None of these |
| Answer» D. None of these | |
| 335. |
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 | |
| 336. |
Additives used for promoting the flocculation of particles is a/an _____________________? |
| A. | Electrolyte |
| B. | Surface active agent |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 337. |
Addition of filter aid to the slurry before filtration is done to _______________ of the cake? |
| A. | Increase the porosity |
| B. | Increase the compressibility co-efficient |
| C. | Decrease the porosity |
| D. | Decrease the compressibility co-efficient |
| Answer» B. Increase the compressibility co-efficient | |
| 338. |
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator ? |
| A. | Cresylic acid |
| B. | Copper sulphate |
| C. | Calcium carbonate |
| D. | Sodium carbonate |
| Answer» C. Calcium carbonate | |
| 339. |
According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________? |
| A. | 0.00184 |
| B. | 0.0184 |
| C. | 0.184 |
| D. | 1.84 |
| Answer» C. 0.184 | |
| 340. |
According to Bond crushing law, the work required to form particle of size ‘D’ from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively) ? |
| A. | (S/V)p |
| B. | √(S/V)p |
| C. | (S/V)2p |
| D. | (S/V)f |
| Answer» C. (S/V)2p | |
| 341. |
About 2-3 hp, power per gallon of a thin liquid provides vigorous agitation in an agitator. ‘Power number’ in agitation is given by __________________? |
| A. | P. gc/n3. D2. ρ |
| B. | P. gc. ρ/μ2 |
| C. | n3. D3. ρ/P. gc |
| D. | P. gc/n2. D2. ρ |
| Answer» B. P. gc. ρ/μ2 | |
| 342. |
A widely used size reduction equipment for ______________ is Bradford breaker? |
| A. | Talc |
| B. | Coal |
| C. | Iron core |
| D. | Wheat |
| Answer» C. Iron core | |
| 343. |
A tube mill as compared to a ball mill__________________? |
| A. | Employs smaller balls |
| B. | Gives finer size reduction but consumes more power |
| C. | Has larger length/diameter ratio (>2 as compared to 1 for ball mill) |
| D. | All A., B. and C. |
| Answer» E. | |
| 344. |
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 | |
| 345. |
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________? |
| A. | 0.1 |
| B. | 0.4 |
| C. | 0.6 |
| D. | None of these |
| Answer» D. None of these | |
| 346. |
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate? |
| A. | Compressible cakes and laminar |
| B. | Incompressible cake and laminar |
| C. | Compressible cake and turbulent |
| D. | Incompressible cake and turbulent |
| Answer» C. Compressible cake and turbulent | |
| 347. |
A screen is said to be blinded, when the___________________? |
| A. | Over-sizes are present in undersize fraction |
| B. | Under-sizes are retained in oversize fraction |
| C. | Screen is plugged with solid particles |
| D. | Screen capacity is abruptly increased |
| Answer» D. Screen capacity is abruptly increased | |
| 348. |
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________? |
| A. | 0.50 |
| B. | 0.58 |
| C. | 0.68 |
| D. | 0.62 |
| Answer» B. 0.58 | |
| 349. |
A propeller agitator_______________? |
| A. | Produces mainly axial flow |
| B. | Is used for mixing high viscosity pastes |
| C. | Runs at very slow speed (2 rpm) |
| D. | All A., B. and C. |
| Answer» B. Is used for mixing high viscosity pastes | |
| 350. |
A pebble mill_________________? |
| A. | Is a ball mill |
| B. | Employs flints or ceramic pebbles as the grinding medium |
| C. | Is a tube mill lined with ceramic or other non-metallic liner |
| D. | Both B. and C. |
| Answer» E. | |