MCQOPTIONS
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MCQOPTIONS
This section includes 591 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. |
Leaching rate is independent of the$? |
| A. | Agitation |
| B. | Temperature |
| C. | Particle size |
| D. | None of these |
| Answer» E. | |
| 452. |
The commonly used solvent in supercritical extraction is$? |
| A. | Methyl ethyl ketone |
| B. | Water |
| C. | Carbon tetrachloride |
| D. | Carbon dioxide |
| Answer» E. | |
| 453. |
Priming in a distillation column$? |
| A. | Results from very low gas velocity |
| B. | Is desirable from point efficiency consideration |
| C. | Is characterised by the presence of foam throughout the space between trays |
| D. | Reduces the overall pressure drop |
| Answer» D. Reduces the overall pressure drop | |
| 454. |
Absorption factor is defined as (where, S‚ÇÅ = slope of the operating line S‚ÇÇ = slope of the equilibrium curve)$? |
| A. | S‚ÇÇ/S‚ÇÅ |
| B. | S‚ÇÅ/S‚ÇÇ |
| C. | S‚ÇÅ - S‚ÇÇ |
| D. | S‚ÇÅ x S‚ÇÇ |
| Answer» C. S‚Äö√á√Ö - S‚Äö√á√á | |
| 455. |
In case of gases, the binary diffusivity is proportional to (where, P = pressure)$? |
| A. | P |
| B. | 1/P |
| C. | 1/‚à öP |
| D. | ‚à öP |
| Answer» C. 1/‚Äö√ √∂P | |
| 456. |
Boiling point diagram is not affected by the ambient$? |
| A. | Pressure |
| B. | Humidity |
| C. | Temperature |
| D. | Both B and C |
| Answer» E. | |
| 457. |
Separation of two volatile liquids by distillation makes use of their$? |
| A. | Selectivity |
| B. | Relative volatility |
| C. | Solubility |
| D. | Density difference |
| Answer» C. Solubility | |
| 458. |
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of$? |
| A. | Vapour pressure of component A to that of component B |
| B. | Vapour pressure of component A to the total pressure |
| C. | Vapour pressure of component A to the partial pressure of A |
| D. | Partial pressure of component A to the total pressure |
| Answer» B. Vapour pressure of component A to the total pressure | |
| 459. |
L/mG is the expression for$? |
| A. | Absorption factor |
| B. | Brinkman number |
| C. | Slope of operating line in absorber |
| D. | Slope of operating line in stripper |
| Answer» B. Brinkman number | |
| 460. |
Azeotropic distillation is employed to separate$? |
| A. | Constant boiling mixture |
| B. | High boiling mixture |
| C. | Mixture with very high relative volatility |
| D. | Heat sensitive materials |
| Answer» B. High boiling mixture | |
| 461. |
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an$? |
| A. | Pure component |
| B. | Binary mixture |
| C. | Ternary mixture |
| D. | Insoluble binary system |
| Answer» B. Binary mixture | |
| 462. |
Milk is dried usually in a __________ dryer.$? |
| A. | Freeze |
| B. | Spray |
| C. | Tray |
| D. | Rotary |
| Answer» C. Tray | |
| 463. |
Which of the following is not a continuous drier?$? |
| A. | Drum drier |
| B. | Spray drier |
| C. | Tunnel drier |
| D. | Tray drier |
| Answer» E. | |
| 464. |
Which of the following operations does not involve leaching?$? |
| A. | Dissolving gold from ores |
| B. | Dissolving pharmaceutical products from bark or roots |
| C. | Dissolving sugar from the cells of the beet |
| D. | Removing nicotine from its water solution by kerosene |
| Answer» E. | |
| 465. |
If f is defined as above, then which of the following applies to a feed at dew point?$? |
| A. | F = 1 |
| B. | F < 1 |
| C. | F > 1 |
| D. | 0 < f < 1 |
| Answer» B. F < 1 | |
| 466. |
Agitator is provided in a crystalliser for$? |
| A. | Avoiding deposition on cooler surfaces |
| B. | Formation of nuclei |
| C. | Crystal growth |
| D. | All of the above |
| Answer» E. | |
| 467. |
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?$? |
| A. | 90 |
| B. | 91.5 |
| C. | 95 |
| D. | 99 |
| Answer» D. 99 | |
| 468. |
Which of the following is a suitable absorbent for removal of H‚ÇÇS from natural gas?$? |
| A. | Vetrocoke solution |
| B. | Monoethanol amine (MEA) |
| C. | Dilute |
| D. | Hot water |
| Answer» C. Dilute | |
| 469. |
The most common packing used in industrial operations is __________ rings.$? |
| A. | Raschig |
| B. | Lessing |
| C. | Cross-partition |
| D. | Single spiral |
| Answer» B. Lessing | |
| 470. |
H‚ÇÇS is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H‚ÇÇS has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is$? |
| A. | 2.0 |
| B. | 1.56 |
| C. | 1.0 |
| D. | 0.56 |
| Answer» B. 1.56 | |
| 471. |
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,$? |
| A. | Inversely |
| B. | Linearly |
| C. | Exponentially |
| D. | None of these |
| Answer» C. Exponentially | |
| 472. |
Which of the following is used for the concentration of rubber latex?$? |
| A. | Agitated film evaporator |
| B. | Long tube vertical evaporator |
| C. | Short tube evaporator |
| D. | Calendria |
| Answer» B. Long tube vertical evaporator | |
| 473. |
In rectifying section of a continuous distillation column, the$? |
| A. | Vapour is enriched with low boilers |
| B. | Vapour is enriched with high boilers |
| C. | Liquid is stripped of high boilers |
| D. | None of these |
| Answer» C. Liquid is stripped of high boilers | |
| 474. |
The falling rate period in the drying of a solid is characterised by$? |
| A. | Increase in rate of drying |
| B. | Increasing temperatures both on the surface and within the solid |
| C. | Decreasing temperatures |
| D. | None of these |
| Answer» C. Decreasing temperatures | |
| 475. |
During drying of a solid, the critical moisture content increases with$? |
| A. | Decreased drying rate |
| B. | Increased thickness of the solid |
| C. | Increased drying rate |
| D. | Both B and C |
| Answer» E. | |
| 476. |
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.$? |
| A. | No change in theoretical |
| B. | Marginal decrease in the number of |
| C. | Major decrease in the number of |
| D. | None of these |
| Answer» C. Major decrease in the number of | |
| 477. |
The process employing desorption of the absorbed solute by a solvent is called$? |
| A. | Elution |
| B. | Osmosis |
| C. | Reverse osmosis |
| D. | Sublimation |
| Answer» B. Osmosis | |
| 478. |
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.$? |
| A. | Free |
| B. | Unbound |
| C. | Equilibrium |
| D. | Bound |
| Answer» D. Bound | |
| 479. |
Mass transfer co-efficient is defined as$? |
| A. | Flux = Co-efficient/concentration difference |
| B. | Co-efficient = Flux/concentration difference |
| C. | Flux=concentration difference/co-effi-cient |
| D. | None of these |
| Answer» C. Flux=concentration difference/co-effi-cient | |
| 480. |
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by$? |
| A. | Solvent extraction |
| B. | Continuous distillation |
| C. | Evaporation |
| D. | Absorption |
| Answer» B. Continuous distillation | |
| 481. |
As the reflux ratio in a distillation coloumn is increased from the minimum, the$? |
| A. | Slope of the operating line in stripping section decreases |
| B. | Number of plates decreases very slowly first and then more and more rapidly |
| C. | Total cost first decreases and then increases |
| D. | Liquid flow increases while the vapor flow decreases for a system |
| Answer» D. Liquid flow increases while the vapor flow decreases for a system | |
| 482. |
Tower diameter may be decreased by$? |
| A. | Using higher reflux ratio |
| B. | Use of increased tray spacing |
| C. | Increasing the liquid flow rate |
| D. | Increasing the vapour flow rate |
| Answer» C. Increasing the liquid flow rate | |
| 483. |
Free flowing granular materials can be best dried in a __________ drier.$? |
| A. | Rotary |
| B. | Cylinder |
| C. | Drun |
| D. | Freeze |
| Answer» B. Cylinder | |
| 484. |
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as$? |
| A. | D ‚Äö√ √π P0.5 |
| B. | D ‚Äö√ √π 1/P0.5 |
| C. | D ‚Äö√ √π 1/P |
| D. | D ‚Äö√ √π 1/P1.5 |
| Answer» D. D ‚Äö√ √π 1/P1.5 | |
| 485. |
For absorbing a sparingly soluble gas in a liquid$? |
| A. | Gas side mass transfer co-efficient should be increased |
| B. | Liquid side mass transfer co-efficient should be increased |
| C. | Liquid side mass transfer co-efficient should be decreased |
| D. | Mass transfer co-efficient must be kept constant |
| Answer» C. Liquid side mass transfer co-efficient should be decreased | |
| 486. |
The minimum liquid rate to be used in an absorber corresponds to an operating line$? |
| A. | Of slope = 1 |
| B. | Ofslope = 0.1 |
| C. | Tangential to the equilibrium curve |
| D. | None of these |
| Answer» D. None of these | |
| 487. |
In paper industry, paper is dried in a __________ dryer.$? |
| A. | Tunnel |
| B. | Heated cylinder |
| C. | Conveyor |
| D. | Festoon |
| Answer» C. Conveyor | |
| 488. |
__________ equation applies to diffusivities in liquids.$? |
| A. | Gilliland |
| B. | Hirschfelder |
| C. | Wilke and Chang |
| D. | None of these |
| Answer» B. Hirschfelder | |
| 489. |
Which of the following unit operations makes use of Thiele-Geddes equation?$? |
| A. | Liquid-liquid extraction |
| B. | Solid-liquid extraction |
| C. | Multicomponent absorption with chemical reaction |
| D. | Multicomponent distillation |
| Answer» E. | |
| 490. |
In a counter-current extractor, as the axial mixing increases, the extraction efficiency$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Depends on the pressure of the system |
| Answer» C. Remains unchanged | |
| 491. |
The expression, y(1 - x)/x(1 - y) is for$? |
| A. | Absorption factor |
| B. | Relative volatility |
| C. | Selectivity |
| D. | Murphree efficiency |
| Answer» C. Selectivity | |
| 492. |
Swenson-Walker crystalliser is a __________ unit$? |
| A. | Continuous |
| B. | Batch |
| C. | Semi-batch |
| D. | Cooling (adiabatic)-cum-evaporation |
| Answer» B. Batch | |
| 493. |
Steam distillation is used to separate$? |
| A. | Azeotropes |
| B. | High boiling substances from nonvolatile impurities |
| C. | Heat sensitive materials |
| D. | Mixtures of low relative volatility |
| Answer» C. Heat sensitive materials | |
| 494. |
Use of natural draft cooling tower is practised, when the air has low$? |
| A. | Humidity |
| B. | Temperature |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 495. |
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.$? |
| A. | 1 |
| B. | 1 to 5 |
| C. | 5 to 10 |
| D. | > 10 |
| Answer» B. 1 to 5 | |
| 496. |
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in$? |
| A. | Greater degree of separation with a fixed number of trays |
| B. | Increased reboiler load |
| C. | Increased reflux ratio |
| D. | None of these |
| Answer» D. None of these | |
| 497. |
Flash distillation is? |
| A. | Same as differential distillation |
| B. | Used for multicomponent systems like crude refining |
| C. | Same as simple distillation |
| D. | Most useful for handling binary systems |
| Answer» C. Same as simple distillation | |
| 498. |
Which of the following is a suitable absorbent for removal of H‚ÇÇS from natural gas?? |
| A. | Vetrocoke solution |
| B. | Monoethanol amine (MEA) |
| C. | Dilute |
| D. | Hot water |
| Answer» C. Dilute | |
| 499. |
The most common packing used in industrial operations is __________ rings.? |
| A. | Raschig |
| B. | Lessing |
| C. | Cross-partition |
| D. | Single spiral |
| Answer» B. Lessing | |
| 500. |
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?? |
| A. | 90 |
| B. | 91.5 |
| C. | 95 |
| D. | 99 |
| Answer» D. 99 | |