MCQOPTIONS
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MCQOPTIONS
This section includes 590 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
_____________ extractor is used for the concentration of radioactive nuclear waste? |
| A. | Pulsed column |
| B. | Sieve plate |
| C. | Mixer-settler |
| D. | Bollman |
| Answer» B. Sieve plate | |
| 452. |
Extraction of penicillin employs a ________________ extraction column? |
| A. | Centrifugal |
| B. | Packed |
| C. | Plate |
| D. | None of these |
| Answer» B. Packed | |
| 453. |
Extraction of coffee from its seed is done by___________________? |
| A. | Liquid-liquid extraction |
| B. | Leaching |
| C. | Extractive distillation |
| D. | Steam distillation |
| Answer» C. Extractive distillation | |
| 454. |
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________? |
| A. | 5.6 × 10-4 |
| B. | 8.5 × 10-4 |
| C. | 5.6 × 10-3 |
| D. | 8.5 × 10-3 |
| Answer» C. 5.6 × 10-3 | |
| 455. |
Experimental determination of _______________ is done by wetted wall column method? |
| A. | Diffusion co-efficient |
| B. | Mass transfer co-efficient |
| C. | NTU |
| D. | None of these |
| Answer» C. NTU | |
| 456. |
Experimental determination of ________________ is done by wetted wall column method? |
| A. | Diffusion co-efficient |
| B. | Mass transfer co-efficient |
| C. | NTU |
| D. | None of these |
| Answer» C. NTU | |
| 457. |
Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the_________________? |
| A. | High evaporation losses of water |
| B. | High pressure drop of the gas |
| C. | Difficulty in its fabrication |
| D. | None of these |
| Answer» C. Difficulty in its fabrication | |
| 458. |
Equilibrium-moisture curves of different solids ____________________ ? |
| A. | Are different |
| B. | Are same |
| C. | Depend on the humidity of the gas |
| D. | None of these |
| Answer» B. Are same | |
| 459. |
_______________ equation applies to diffusivities in liquids? |
| A. | Gilliland |
| B. | Hirschfelder |
| C. | Wilke and Chang |
| D. | None of these |
| Answer» B. Hirschfelder | |
| 460. |
Entrainer used in Azeotropic distillation should____________________? |
| A. | Form a low boiling azeotrope with one of the constituents of the mixture |
| B. | Form a new azeotrope of low relative volatility with one of the constituents of the mixture |
| C. | Have high latent heat of vaporisation |
| D. | Have high viscosity to provide high tray efficiency |
| Answer» B. Form a new azeotrope of low relative volatility with one of the constituents of the mixture | |
| 461. |
During the constant rate period of drying of a solid ? |
| A. | Increased air humidity decreases the rate of drying |
| B. | Increasing the air temperature decreases the drying rate |
| C. | Surface evaporation of unbound moisture occurs |
| D. | None of these |
| Answer» D. None of these | |
| 462. |
During sensible cooling process ______________________? |
| A. | Relative humidity decreases |
| B. | Relative humidity increases |
| C. | Wet bulb temperature decreases |
| D. | Both B. and C. |
| Answer» E. | |
| 463. |
During drying operation, it is easier to remove the ________________ moisture ? |
| A. | Equilibrium |
| B. | Critical |
| C. | Unbound |
| D. | Bound |
| Answer» D. Bound | |
| 464. |
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the _________________ remains constant ? |
| A. | Wet bulb temperature |
| B. | Partial pressure of water vapor |
| C. | Relative humidity |
| D. | None of these |
| Answer» B. Partial pressure of water vapor | |
| 465. |
During constant rate period, the rate of drying decreases with the______________________? |
| A. | Decrease in air temperature |
| B. | Increase in air humidity |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 466. |
During constant rate drying period, vaporisation rate per unit drying surface area _____________________? |
| A. | Decreases with time |
| B. | Increases with time |
| C. | Does not change with time |
| D. | Does not affect the moisture content of the wet solid |
| Answer» D. Does not affect the moisture content of the wet solid | |
| 467. |
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the___________________? |
| A. | Gas film |
| B. | Liquid film |
| C. | Liquid-gas interface |
| D. | None of these |
| Answer» C. Liquid-gas interface | |
| 468. |
Drying operation under vacuum is carried out to __________________? |
| A. | Dry those materials which have very high unbound moisture content |
| B. | Reduce drying temperature |
| C. | Increase drying temperature |
| D. | Dry materials having high bound moisture content |
| Answer» C. Increase drying temperature | |
| 469. |
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________? |
| A. | Humidity |
| B. | Velocity |
| C. | Temperature |
| D. | All A., B. & C. |
| Answer» E. | |
| 470. |
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant______________________? |
| A. | Humidity |
| B. | Velocity |
| C. | Temperature |
| D. | All A., B. & C. |
| Answer» E. | |
| 471. |
Drying of a solid involves _________________ transfer ? |
| A. | Only heat |
| B. | Only mass |
| C. | Both heat and mass |
| D. | None of these |
| Answer» D. None of these | |
| 472. |
Dryer widely used in a textile industry is ______________ dryer? |
| A. | Festoon |
| B. | Cylinder |
| C. | Conveyor |
| D. | Tunnel |
| Answer» D. Tunnel | |
| 473. |
Dry bulb temperature of the gas is _____________ the wet bulb temperature? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 474. |
Dry bulb temperature of unsaturated air is more than its ________________ temperature? |
| A. | Dew point |
| B. | Wet bulb |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 475. |
Drift in a cooling tower is ___________________? |
| A. | The water entrained by the circulating air |
| B. | Dependent on the water lost by evaporation |
| C. | Desirable |
| D. | All A., B. & C. |
| Answer» B. Dependent on the water lost by evaporation | |
| 476. |
Dried finished product sampled from various parts of a ________________ dryer exhibits nonuniformity in the moisture content? |
| A. | Rotary |
| B. | Tray |
| C. | Freeze |
| D. | None of these |
| Answer» C. Freeze | |
| 477. |
Dorr thickener is an equipment used for___________________? |
| A. | Classification |
| B. | Sedimentation |
| C. | Clarification |
| D. | Leaching |
| Answer» C. Clarification | |
| 478. |
Dorr thickener is an equipment used for______________________? |
| A. | Classification |
| B. | Sedimentation |
| C. | Clarification |
| D. | Leaching |
| Answer» C. Clarification | |
| 479. |
Dimension of mass diffusivity is the same as that of_____________________? |
| A. | Kinematic viscosity |
| B. | Dynamic viscosity |
| C. | Surface tension |
| D. | Pressure |
| Answer» B. Dynamic viscosity | |
| 480. |
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________? |
| A. | Viscosity with concentration |
| B. | Degree of ideality of the solution |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 481. |
_______________ diffusion is used for separating the isotopes of methane ? |
| A. | Thermal |
| B. | Pressure |
| C. | Concentration |
| D. | Force |
| Answer» B. Pressure | |
| 482. |
Diffusion in concentrated solutions differs from that in dilute solutions, because of the change in the _______________ with the concentration of the solution? |
| A. | Degree of ideality |
| B. | Viscosity |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 483. |
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________? |
| A. | Mass transfer co-efficient |
| B. | Thermal diffusivity |
| C. | Kinematic viscosity |
| D. | Volumetric diffusivity |
| Answer» B. Thermal diffusivity | |
| 484. |
Diameter to height ratio for a raschig ring is_____________________? |
| A. | 1 |
| B. | 0.5 |
| C. | 2 |
| D. | 8 |
| Answer» B. 0.5 | |
| 485. |
Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches? |
| A. | 2 |
| B. | 8 |
| C. | 12 |
| D. | 18 |
| Answer» B. 8 | |
| 486. |
Dew point of an air-water vapor mixture_________________? |
| A. | Decreases with decrease in pressure |
| B. | At constant humidity & total pressure is fixed |
| C. | Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the satur |
| D. | All A , B. & C. |
| Answer» E. | |
| 487. |
Dew point of a gas-vapour mixture_____________________? |
| A. | Increases with temperature rise |
| B. | Decreases with temperature rise |
| C. | Decreases with decrease in pressure |
| D. | Increases with increase in pressure |
| Answer» D. Increases with increase in pressure | |
| 488. |
_______________ developed the film theory ? |
| A. | Higbie |
| B. | Fick |
| C. | Ergun |
| D. | Levenspiel |
| Answer» B. Fick | |
| 489. |
Detergent solution is dried to a powder in a ________________________? |
| A. | Spray dryer |
| B. | Spouted bed dryer |
| C. | Tunnel dryer |
| D. | Pan open to atmosphere |
| Answer» B. Spouted bed dryer | |
| 490. |
Desulphurisation of petrol is done in a _____________________? |
| A. | Bollman extractor |
| B. | Rotating disc extractor |
| C. | Packed extraction column |
| D. | Plate type extraction column |
| Answer» C. Packed extraction column | |
| 491. |
Desirable value of absorption factor in an absorber is___________________? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 492. |
Design calculation for multiple component distillation is done by_________________? |
| A. | Ponchon-Savarit method |
| B. | McCabe-Thiele method |
| C. | Enthalpy concentration method |
| D. | Tray to tray calculations |
| Answer» E. | |
| 493. |
Degree of freedom for leaching and solvent extraction process is_____________________? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 494. |
Decoction refers to the use of solvent________________? |
| A. | At ambient temperature |
| B. | At its boiling point |
| C. | In its vapor form |
| D. | None of these |
| Answer» C. In its vapor form | |
| 495. |
Deaeration (removal of O2) of water is done by_________________? |
| A. | Rectification |
| B. | Absorption |
| C. | Ion-exchange |
| D. | Adsorption |
| Answer» D. Adsorption | |
| 496. |
Danckwerts developed the ____________________ theory? |
| A. | Penetration |
| B. | Surface renewal |
| C. | Film |
| D. | None of these |
| Answer» C. Film | |
| 497. |
Critical humidity of a solid salt means the humidity_____________________? |
| A. | Above which it will always become damp |
| B. | Below which it will always stay dry |
| C. | Both A. and B. |
| D. | Above Which it will always become dry and below which it will always stay damp |
| Answer» D. Above Which it will always become dry and below which it will always stay damp | |
| 498. |
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ? |
| A. | log P vs. T |
| B. | log P vs. log T |
| C. | T vs. P |
| D. | P vs. log T |
| Answer» B. log P vs. log T | |
| 499. |
Cox chart is useful in the design of___________________? |
| A. | Distillation column |
| B. | Evaporator |
| C. | Dryer |
| D. | Crystalliser |
| Answer» B. Evaporator | |
| 500. |
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number? |
| A. | Schmidt |
| B. | Sherwood |
| C. | Peclet |
| D. | Stanton |
| Answer» B. Sherwood | |