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.
| 501. |
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 | |
| 502. |
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. | |
| 503. |
Rate of leaching increases with increasing? |
| A. | Temperature |
| B. | Viscosity of solvent |
| C. | Pressure |
| D. | Size of the solid |
| Answer» B. Viscosity of solvent | |
| 504. |
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively? |
| A. | < 1 and ‚Äö√¢√ 1 |
| B. | 1 and 0 |
| C. | >1 and ‚Äö√¢√ 1 |
| D. | 0 and ‚Äö√¢√ 1 |
| Answer» B. 1 and 0 | |
| 505. |
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will? |
| A. | Increase |
| B. | Decrease |
| C. | Remains same |
| D. | Depend on saturated boiling point; may increase or decrease |
| Answer» B. Decrease | |
| 506. |
Heat load in a cooling tower? |
| A. | Means the amount of heat thrown away (KCal/hr.) by the cooling tower |
| B. | Is equal to the number of kg, of water circulated times the cooling range |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 507. |
Fractional solvent extraction? |
| A. | Employs only one solvent |
| B. | Employs two solvents |
| C. | Results in low interfacial tension |
| D. | None of these |
| Answer» C. Results in low interfacial tension | |
| 508. |
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?? |
| A. | Cooling and dehumidification |
| B. | Heating and dehumidification at almost constant wet bulb temperature |
| C. | Dehumidification with dry bulb temperature remaining constant |
| D. | None of these |
| Answer» C. Dehumidification with dry bulb temperature remaining constant | |
| 509. |
The solvent used in liquid-liquid extraction should have __________ less than one.? |
| A. | Selectivity |
| B. | Distribution co-efficient |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» E. | |
| 510. |
An ideal tower packing should not? |
| A. | Have low weight per unit volume |
| B. | Have large surface area per unit volume |
| C. | Have large free cross-section |
| D. | Hold up large amount of liquid in the packing |
| Answer» E. | |
| 511. |
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 | |
| 512. |
Leaching rate is independent of the? |
| A. | Agitation |
| B. | Temperature |
| C. | Particle size |
| D. | None of these |
| Answer» E. | |
| 513. |
The commonly used solvent in supercritical extraction is? |
| A. | Methyl ethyl ketone |
| B. | Water |
| C. | Carbon tetrachloride |
| D. | Carbon dioxide |
| Answer» E. | |
| 514. |
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 | |
| 515. |
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 | |
| 516. |
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 | |
| 517. |
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 | |
| 518. |
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 | |
| 519. |
Boiling point diagram is not affected by the ambient? |
| A. | Pressure |
| B. | Humidity |
| C. | Temperature |
| D. | Both B and C |
| Answer» E. | |
| 520. |
Separation of two volatile liquids by distillation makes use of their? |
| A. | Selectivity |
| B. | Relative volatility |
| C. | Solubility |
| D. | Density difference |
| Answer» C. Solubility | |
| 521. |
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 | |
| 522. |
In paper industry, paper is dried in a __________ dryer.? |
| A. | Tunnel |
| B. | Heated cylinder |
| C. | Conveyor |
| D. | Festoon |
| Answer» C. Conveyor | |
| 523. |
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 | |
| 524. |
__________ equation applies to diffusivities in liquids.? |
| A. | Gilliland |
| B. | Hirschfelder |
| C. | Wilke and Chang |
| D. | None of these |
| Answer» B. Hirschfelder | |
| 525. |
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 | |
| 526. |
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 | |
| 527. |
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 | |
| 528. |
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 | |
| 529. |
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 | |
| 530. |
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 | |
| 531. |
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 | |
| 532. |
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 | |
| 533. |
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. | |
| 534. |
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. | |
| 535. |
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 | |
| 536. |
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 | |
| 537. |
Which of the following is not a continuous drier?? |
| A. | Drum drier |
| B. | Spray drier |
| C. | Tunnel drier |
| D. | Tray drier |
| Answer» E. | |
| 538. |
Rayleigh's equation applies to __________ distillation.? |
| A. | Continuous |
| B. | Steam |
| C. | Differential |
| D. | Flash |
| Answer» D. Flash | |
| 539. |
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.? |
| A. | 25 |
| B. | > 25 |
| C. | < 25 |
| D. | - 25 |
| Answer» C. < 25 | |
| 540. |
The caking of crystals can be prevented by? |
| A. | Maintaining high critical humidity |
| B. | Maintaining low critical humidity |
| C. | Coating the product with inert material |
| D. | Both A and C |
| Answer» E. | |
| 541. |
Steady state equimolal counter diffusion is encountered in? |
| A. | Separation of a binary mixture by distillation |
| B. | Absorption of NH‚ÇÉ from air by water |
| C. | All liquid-liquid diffusion systems |
| D. | All of the above |
| Answer» B. Absorption of NH‚Äö√á√â from air by water | |
| 542. |
Make up water is supplied during cooling tower operation to compensate for water losses due to? |
| A. | Evaporation |
| B. | Blowdown |
| C. | Entrainment |
| D. | All of the above |
| Answer» E. | |
| 543. |
Free flowing granular materials can be best dried in a __________ drier.? |
| A. | Rotary |
| B. | Cylinder |
| C. | Drun |
| D. | Freeze |
| Answer» B. Cylinder | |
| 544. |
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 | |
| 545. |
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 | |
| 546. |
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 | |
| 547. |
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 | |
| 548. |
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 | |
| 549. |
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 | |
| 550. |
Milk is dried usually in a __________ dryer.? |
| A. | Freeze |
| B. | Spray |
| C. | Tray |
| D. | Rotary |
| Answer» C. Tray | |