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.
| 1. |
Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ? |
| A. | Packed towers |
| B. | Plate towers |
| C. | Spray towers |
| D. | Wetted wall columns |
| Answer» E. | |
| 2. |
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease; depends on individual design |
| Answer» B. Decreases | |
| 3. |
With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature) ? |
| A. | Increases |
| B. | Remains unchanged |
| C. | Decreases |
| D. | Decreases linearly |
| Answer» B. Remains unchanged | |
| 4. |
With increase in pressure, the relative volatility for a binary system__________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Either A. or B., depends on the system |
| Answer» C. Remains same | |
| 5. |
With increase in pressure, the relative volatility for a binary system_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Either A. or B., depends on the system |
| Answer» C. Remains same | |
| 6. |
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas________________? |
| A. | Increases |
| B. | Decreases |
| C. | Decreases linearly |
| D. | Remain unaffected |
| Answer» C. Decreases linearly | |
| 7. |
With increase in temperature, the leaching rate increases due to__________________? |
| A. | Decreased liquid viscosity |
| B. | Increased diffusivity |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 8. |
With increase in temperature, the leaching rate increases because of the _____________________? |
| A. | Increased diffusivity |
| B. | Decreased viscosity of liquid |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 9. |
With increase in temperature, the mutual solubility of two liquids_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Decreases exponentially |
| Answer» B. Decreases | |
| 10. |
With increase in temperature, the mutual solubility of two liquids___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Decreases exponentially |
| Answer» B. Decreases | |
| 11. |
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Increases Linearly |
| Answer» B. Decreases | |
| 12. |
With increase in temperature, the rate of leaching increases, because the___________________? |
| A. | Diffusivity of solute increases |
| B. | Viscosity of solvent decreases |
| C. | Thermal conductivity of solute increases |
| D. | None of these |
| Answer» B. Viscosity of solvent decreases | |
| 13. |
With increase in temperature, the solubility of gases in liquids, at fixed pressure____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Either A. or B., depends on the system |
| Answer» C. Remain same | |
| 14. |
With increase in the concentration of the adsorbate, the integral heat of adsorption____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | May increase or decrease; depends on the type of adsorbate |
| Answer» C. Remains unchanged | |
| 15. |
With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________? |
| A. | Decreases |
| B. | Remains unchanged |
| C. | Increases |
| D. | Decreases exponentially |
| Answer» D. Decreases exponentially | |
| 16. |
With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Increases linearly |
| Answer» B. Decreases | |
| 17. |
With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux__________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease; depends on system |
| Answer» C. Remain same | |
| 18. |
With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Either A. or B., depends on the system |
| Answer» C. Remain same | |
| 19. |
With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent______________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Either A. or B., depends on the system |
| Answer» C. Remain same | |
| 20. |
Which of the following solutions will follow Raoult’s law most closely ? |
| A. | A solution of benzene, toluene and o-xylene |
| B. | 35% solution of camphor in water |
| C. | 35% solution of NH3 in water |
| D. | A solution of polar organic compounds (not of homologue of a series) |
| Answer» B. 35% solution of camphor in water | |
| 21. |
Which of the following quantities need not be fixed before starting the design of a cocurrent absorber ? |
| A. | Heat gain or loss |
| B. | Flow rate of entering liquid |
| C. | Flow rate of gas |
| D. | None of these |
| Answer» C. Flow rate of gas | |
| 22. |
Which of the following provides maximum contact surface for a liquid-vapour system ? |
| A. | Packed tower |
| B. | Bubble-cap plate column |
| C. | Sieve-plate column |
| D. | Wetted wall column |
| Answer» B. Bubble-cap plate column | |
| 23. |
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ? |
| A. | Humidification only |
| B. | Heating only |
| C. | Both heating and humidification |
| D. | Evaporative cooling |
| Answer» D. Evaporative cooling | |
| 24. |
Which of the following parameters remains constant during chemical dehumidification ? |
| A. | Dry bulb temperature |
| B. | Partial pressure of vapour |
| C. | Wet bulb temperature |
| D. | None of these |
| Answer» B. Partial pressure of vapour | |
| 25. |
Which of the following mixtures does not form an azeotrope at atmospheric pressure ? |
| A. | Water-alcohol |
| B. | Methyl alcohol-acetone |
| C. | Butyl acetate-water |
| D. | None of these |
| Answer» E. | |
| 26. |
Which of the following is not a unit of mass transfer co-efficient ? |
| A. | Moles transferred/ [(time) (area) (mole fraction)] |
| B. | Moles transferred/ [(time) (area) (mass A/mass B)] |
| C. | Moles transferred/ [(time) (area) (pressure)] |
| D. | None of these |
| Answer» E. | |
| 27. |
Which of the following is not a batch drier ? |
| A. | Truck drier |
| B. | Agitated pan drier |
| C. | Fluidised bed drier |
| D. | Vacuum shelf drier |
| Answer» D. Vacuum shelf drier | |
| 28. |
Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ? |
| A. | Partial condenser |
| B. | Total condenser |
| C. | Reboiler |
| D. | Both B. and C |
| Answer» E. | |
| 29. |
Which of the following employs an accessory known as ‘drift eliminator’ ? |
| A. | Multiple effect evaporator |
| B. | Mechanical draft cooling tower |
| C. | Rotary dryer |
| D. | Rotating disc contactor |
| Answer» C. Rotary dryer | |
| 30. |
Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ? |
| A. | Dew point |
| B. | Humidity ratio |
| C. | Wet bulb temperature |
| D. | None of these |
| Answer» D. None of these | |
| 31. |
Which of the following adsorbent is used in the refining of sugar? |
| A. | Bone charcoal |
| B. | Wood charcoal |
| C. | Silica gel |
| D. | Activated clay |
| Answer» B. Wood charcoal | |
| 32. |
Which is the controlling factor for a drum drier ? |
| A. | Diffusion |
| B. | Heat transfer |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 33. |
When the ____________________ the relative humidity of air decreases, despite an increase in the absolute humidity? |
| A. | Temperature rises |
| B. | Pressure rises |
| C. | Pressure rises |
| D. | Pressure falls |
| Answer» B. Pressure rises | |
| 34. |
When the temperature and humidity of air is low, we usually use _______________ draft cooling tower? |
| A. | Natural |
| B. | Forced |
| C. | Induced |
| D. | None of these |
| Answer» B. Forced | |
| 35. |
When the solvent dissolves very little of solute, then__________________________? |
| A. | Solvent of low latent heat of vaporisation should be used |
| B. | Solvent of low freezing point should be used |
| C. | Large quantity of solvent is required to extract the solute |
| D. | Very small quantity of solvent is required |
| Answer» D. Very small quantity of solvent is required | |
| 36. |
When the psychometric ratio is ______________ then the adiabatic saturation temperature and wet bulb temperature becomes equal? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | ∞ |
| Answer» B. < 1 | |
| 37. |
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation? |
| A. | Continuous |
| B. | Steam |
| C. | Azeotropic |
| D. | None of these |
| Answer» C. Azeotropic | |
| 38. |
When the liquid over a plate is of uniform concentration, then ______________________? |
| A. | Murphree efficiency > point efficiency |
| B. | Murphree efficiency < point efficiency |
| C. | Murphree efficiency = point efficiency |
| D. | Murphree efficiency ≠ point efficiency |
| Answer» D. Murphree efficiency ≠ point efficiency | |
| 39. |
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 | |
| 40. |
When the gas to be dissolved in liquid is a/an ___________________ then normally co-current adsorber are used? |
| A. | Mixture of two gases |
| B. | Pure gas |
| C. | Ideal gas |
| D. | Sparingly soluble gas |
| Answer» C. Ideal gas | |
| 41. |
When the feed to a distillation column is a saturated liquid, slope of the feed line is_____________________? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | None of these |
| Answer» D. None of these | |
| 42. |
When both the fluids flow concurrently in an absorber, the slope of the operating line is____________________? |
| A. | -ve |
| B. | +ve |
| C. | 1 |
| D. | -1 |
| Answer» B. +ve | |
| 43. |
When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ? |
| A. | The partial pressure of water vapour increases |
| B. | The specific humidity decreases |
| C. | The relative humidity increases |
| D. | The relative humidity decreases |
| Answer» E. | |
| 44. |
When adsorption hysteresis is observed, the desorption equilibrium pressure is _________________ that obtained by adsorption? |
| A. | Always lower than |
| B. | Always higher than |
| C. | Same as |
| D. | Dependent on the system; can be either lower or higher than |
| Answer» B. Always higher than | |
| 45. |
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system ? |
| A. | As the acetone concentration increases, the solubility curves approach each other |
| B. | Both the phases become identical at a particular common point on both the solubility curves called the plait point |
| C. | The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y |
| D. | All A., B. and C. |
| Answer» E. | |
| 46. |
Wetted wall tower experiment determines the__________________? |
| A. | Molal diffusivity |
| B. | Volumetric co-efficient |
| C. | Mass transfer co-efficient |
| D. | None of these |
| Answer» D. None of these | |
| 47. |
Wet bulb and dry bulb temperatures becomes identical at _______________ percent saturation curve? |
| A. | 100 |
| B. | 50 |
| C. | 78 |
| D. | None of these |
| Answer» B. 50 | |
| 48. |
Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is_________________? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Unpredictable |
| Answer» B. More | |
| 49. |
Weeping in a distillation column_____________________? |
| A. | Increases tray efficiency |
| B. | Provides large interfacial surface for mass transfer |
| C. | Results due to very high gas velocity |
| D. | Results due to very low gas velocity |
| Answer» E. | |
| 50. |
Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by ________________ distillation? |
| A. | Atmospheric |
| B. | Vacuum |
| C. | High pressure |
| D. | None of these |
| Answer» C. High pressure | |