7081. If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is
L/G
G/L
Always < 1
None of these
✅ The correct answer is option A.
Chemical Engineering
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7082. Boiling point diagram is
Not affected by pressure
Affected by pressure
A plot of temperature vs. liquid composition
A plot of temperature vs. vapour composition
✅ The correct answer is option B.
7083. Mass transfer co-efficient ‘K’ according to penetration theory varies with mass dif-fusivity as
D0.5
D
1/D
D1.5
✅ The correct answer is option A.
7084. 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.
7085. 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.
7086. 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.
7087. 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.
7088. 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.
7089. 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.
7090. 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.