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.
| 51. |
Use of packed towers for distillation is generally limited to the%! |
| A. | Small sizes |
| B. | Multicomponent distillation |
| C. | High pressure operation |
| D. | Vacuum distillation |
| Answer» B. Multicomponent distillation | |
| 52. |
Which of the following is not a continuous leaching equipment?%! |
| A. | Pachuka tank |
| B. | Kennedy extractor |
| C. | Bollman extractor |
| D. | Hydrocyclones |
| Answer» B. Kennedy extractor | |
| 53. |
The main reason for dividing a tall packed tower into series of small towers is to%! |
| A. | Minimise the overall pressure drop |
| B. | Avoid flooding |
| C. | Reduce liquid hold up |
| D. | Avoid channeling |
| Answer» E. | |
| 54. |
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 ‚Äö√¢‚Ä point efficiency | |
| 55. |
Separation of two or more components of a liquid solution can not be achieved by%! |
| A. | Fractional crystallisation |
| B. | Liquid extraction |
| C. | Absorption |
| D. | Evaporation |
| Answer» D. Evaporation | |
| 56. |
*$___________ column is used in gas absorption process.? |
| A. | Wetted wall |
| B. | Seive/perforated tray |
| C. | Bubble cap |
| D. | Packed |
| Answer» E. | |
| 57. |
*$_Smoke is an example of? |
| A. | Solid dispersed in liquid |
| B. | Solid dispersed in gas |
| C. | Liquid dispersed in gas |
| D. | Gas dispersed in liquid |
| Answer» C. Liquid dispersed in gas | |
| 58. |
*$_At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?? |
| A. | 0 |
| B. | 1 |
| C. | ‚à û |
| D. | < 1 |
| Answer» D. < 1 | |
| 59. |
*$_Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled? |
| A. | And humidified |
| B. | And dehumidified with increase in wet bulb temperature |
| C. | At the same relative humidity |
| D. | And dehumidified with decrease in wet bulb temperature |
| Answer» E. | |
| 60. |
*$___________ extractor uses centrifugal force for separating the two phases.? |
| A. | Treybal |
| B. | Schiebel |
| C. | Podbielniak |
| D. | None of these |
| Answer» D. None of these | |
| 61. |
*$_Separation of __________ employs gaseous diffusion process.? |
| A. | N‚ÇÇ and O‚ÇÇ from air |
| B. | Isotopes of uranium |
| C. | Isotopes of helium |
| D. | SO‚ÇÇ and air |
| Answer» C. Isotopes of helium | |
| 62. |
*$_Plate efficiency? |
| A. | Is a function of the mass transfer between liquid and vapour |
| B. | Increases due to foaming |
| C. | Increases due to liquid entrainment |
| D. | Increases due to weeping and dumping of liquid |
| Answer» B. Increases due to foaming | |
| 63. |
*$_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. | Remains same |
| D. | Increases linearly |
| Answer» B. Decreases | |
| 64. |
*$_In batch distillation with constant reflux, overhead product composition __________ with time.? |
| A. | Increases |
| B. | Decreases |
| C. | Does not vary |
| D. | May increase on decrease, depends on the system |
| Answer» C. Does not vary | |
| 65. |
*$_Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Either A or B; depends on the solid |
| Answer» B. More than | |
| 66. |
*$_Antibiotics are best handled in a? |
| A. | Podbielniak extractor |
| B. | Sieve tray contractor |
| C. | Rotating disc contactor |
| D. | Pulsed column extractor |
| Answer» B. Sieve tray contractor | |
| 67. |
*$_If a‚ÇÅ and a‚ÇÇ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.? |
| A. | a‚ÇÅ = a‚ÇÇ |
| B. | a‚ÇÅ = 2a‚ÇÇ |
| C. | a‚ÇÅ = 0.5 a‚ÇÇ |
| D. | None of these |
| Answer» E. | |
| 68. |
*$_As the reflux ratio decreases, the? |
| A. | Separation becomes more efficient |
| B. | Number of plates increases |
| C. | Column diameter increases |
| D. | None of these |
| Answer» C. Column diameter increases | |
| 69. |
*$_In a binary system, separation is very efficient, when the relative volatility is? |
| A. | 1 |
| B. | > 1 |
| C. | < 1 |
| D. | 0.5 |
| Answer» C. < 1 | |
| 70. |
*$_According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.? |
| A. | 5 |
| B. | 9 |
| C. | 12 |
| D. | 28 |
| Answer» D. 28 | |
| 71. |
*$_Large scale usage of flash distillation is practised in? |
| A. | Soap manufacturing |
| B. | Ammonia synthesis plant |
| C. | Polymerisation industry |
| D. | Petroleum refinning |
| Answer» E. | |
| 72. |
*$_With increase in the concentration of the adsorbate, the integral heat of adsorption? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | May increase or decrease ; depends on the type of adsorbate |
| Answer» C. Remains unchanged | |
| 73. |
*$_Separation of the isotopes of helium for scientific investigations is done by? |
| A. | Reverse osmosis |
| B. | Thermal diffusion |
| C. | Leaching |
| D. | Solvent extraction |
| Answer» C. Leaching | |
| 74. |
*$_In saturated gas, the? |
| A. | Vapour is in equilibrium with the liquid at the gas temperature |
| B. | Vapour is in equilibrium with the liquid at the room temperature |
| C. | Partial pressure of vapour equals the vapour pressure of the liquid at room temperature |
| D. | None of these |
| Answer» B. Vapour is in equilibrium with the liquid at the room temperature | |
| 75. |
*$_Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.? |
| A. | At < 100 |
| B. | At > 210.6 |
| C. | Between 100 and 210 |
| D. | None of these |
| Answer» B. At > 210.6 | |
| 76. |
*$_With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas? |
| A. | Increases |
| B. | Decreases |
| C. | Decreases linearly |
| D. | Remains unaffected |
| Answer» C. Decreases linearly | |
| 77. |
*$_At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.? |
| A. | Operating |
| B. | Total |
| C. | Minimum |
| D. | Maximum permissible |
| Answer» C. Minimum | |
| 78. |
*$_Lewis number (Le) is? |
| A. | Sc x Pr |
| B. | Pr x St |
| C. | Sh x Pr |
| D. | St x Sh |
| Answer» B. Pr x St | |
| 79. |
*$_With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease ; depends on individual design |
| Answer» B. Decreases | |
| 80. |
*$_The dew point of a saturated gas phase equals the __________ temperature.? |
| A. | Gas |
| B. | Room |
| C. | Wet bulb |
| D. | None of these |
| Answer» B. Room | |
| 81. |
*$_Large scale drying of sugar is done in a __________ dryer.? |
| A. | Spouted bed |
| B. | Tray |
| C. | Rotary |
| D. | Truck |
| Answer» D. Truck | |
| 82. |
*$_Desulphurisation of petrol is done in a? |
| A. | Bollman extractor |
| B. | Rotating disc extractor |
| C. | Packed extraction column |
| D. | Plate type extraction column |
| Answer» C. Packed extraction column | |
| 83. |
*$___________ is concerned with the adsorption equilibria.? |
| A. | Fick's law |
| B. | Gibb's equation |
| C. | Freundlich equation |
| D. | None of these |
| Answer» D. None of these | |
| 84. |
*$_Dorr thickener is an equipment used for? |
| A. | Classification |
| B. | Sedimentation |
| C. | Clarification |
| D. | Leaching |
| Answer» C. Clarification | |
| 85. |
*$_H‚ÇÇS present in naphtha reformed gas is removed by absorbing with? |
| A. | Ethanolamine |
| B. | K‚ÇÇCO‚ÇÉ |
| C. | HCl |
| D. | Vacuum gas oil |
| Answer» B. K‚Äö√á√áCO‚Äö√á√â | |
| 86. |
*$_In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in? |
| A. | Reducing the axial mixing |
| B. | Increasing the rate of extraction |
| C. | Maintaining the concentration difference between the two phases |
| D. | All of the above |
| Answer» E. | |
| 87. |
*$_Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their? |
| A. | Viscosity |
| B. | Density |
| C. | Solubility |
| D. | Relative volatility |
| Answer» D. Relative volatility | |
| 88. |
*$_At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.? |
| A. | 100 |
| B. | 0 |
| C. | 50 |
| D. | Between 0 and 100 |
| Answer» C. 50 | |
| 89. |
*$_The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the? |
| A. | Differential heat of adsorption |
| B. | Heat of wetting |
| C. | Integral heat of adsorption |
| D. | None of these |
| Answer» B. Heat of wetting | |
| 90. |
*$_The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is? |
| A. | 1 |
| B. | ‚à û |
| C. | 0.5 |
| D. | 2 |
| Answer» B. ‚Äö√ √ª | |
| 91. |
*$_Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.? |
| A. | Indirect tray |
| B. | Spray |
| C. | Freeze |
| D. | None of these |
| Answer» D. None of these | |
| 92. |
*$_Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?? |
| A. | Dew point |
| B. | Humidity ratio |
| C. | Wet bulb temperature |
| D. | None of these |
| Answer» D. None of these | |
| 93. |
*$_Use of packed towers for distillation is generally limited to the? |
| A. | Small sizes |
| B. | Multicomponent distillation |
| C. | High pressure operation |
| D. | Vacuum distillation |
| Answer» B. Multicomponent distillation | |
| 94. |
*$_Which of the following is not a continuous leaching equipment?? |
| A. | Pachuka tank |
| B. | Kennedy extractor |
| C. | Bollman extractor |
| D. | Hydrocyclones |
| Answer» B. Kennedy extractor | |
| 95. |
*$_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 ‚Äö√¢‚Ä point efficiency | |
| 96. |
*$_Separation of two or more components of a liquid solution can not be achieved by? |
| A. | Fractional crystallisation |
| B. | Liquid extraction |
| C. | Absorption |
| D. | Evaporation |
| Answer» D. Evaporation | |
| 97. |
*$_Low viscosity absorbent is preferred for reasons of? |
| A. | Rapid absorption rates and good heat transfer characteristics |
| B. | Improved flooding characteristics |
| C. | Low pressure drop on pumping |
| D. | All of the above |
| Answer» E. | |
| 98. |
*$_The main reason for dividing a tall packed tower into series of small towers is to? |
| A. | Minimise the overall pressure drop |
| B. | Avoid flooding |
| C. | Reduce liquid hold up |
| D. | Avoid channeling |
| Answer» E. | |
| 99. |
*$_A minimum boiling azeotrope is exemplified by? |
| A. | Toluene-benzene |
| B. | Acetone-carbon disulphide |
| C. | Water-isobutyl alcohol |
| D. | None of these |
| Answer» C. Water-isobutyl alcohol | |
| 100. |
*$_When a multistage tray tower uses a minimum reflux ratio, it implies? |
| A. | Infinite trays and maximum reboiler heat load |
| B. | Infinite trays and minimum reboiler heat load |
| C. | Minimum trays and minimum reboiler heat load |
| D. | Minimum trays and maximum reboiler heat load |
| Answer» B. Infinite trays and minimum reboiler heat load | |