D0.5
D
1/D
D1.5
✅ The correct answer is option A.
Chemical Engineering MCQs
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high
Viscosity variation of the fluids may cause channeling/flooding
None of these
✅ The correct answer is option A.
Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.
Less than
More than
Equal to
Either A or B; depends on the solid
✅ The correct answer is option A.
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
Humidity
Velocity
Temperature
All of the above
✅ The correct answer is option D.
When the solvent dissolves very little of solute, then
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required
✅ The correct answer is option C.
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.
Indirect tray
Spray
Freeze
None of these
✅ The correct answer is option C.
As the reflux ratio decreases, the
Separation becomes more efficient
Number of plates increases
Column diameter increases
None of these
✅ The correct answer is option B.
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
Natural
Forced
Induced
None of these
✅ The correct answer is option A.
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.
21.7
20
27.3
18.7
✅ The correct answer is option D.
For an absorber, both equilibrium and operating line will be straight for
Concentrated solution and non-isothermal operation
Dilute solution and non-isothermal operation
Dilute solution and isothermal operation
Concentrated solution and isothermal operation
✅ The correct answer is option C.