7481. For a binary mixture with low relative volatility,
Use steam distillation
Use molecular distillation
Use high pressure distillation
An azeotrope may be formed during distillation
✅ The correct answer is option D.
Chemical Engineering
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7482. __________ developed the film theory.
Higbie
Fick
Ergun
Levenspeil
✅ The correct answer is option A.
7483. According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to
F
F/2
2f
1/f
✅ The correct answer is option B.
7484. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Higher dew point
Higher absolute (specific) humidity
Higher relative humidity
Higher wet bulb temperature
✅ The correct answer is option C.
7485. 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.
25
> 25
< 25
-25
✅ The correct answer is option B.
7486. With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux
Increases
Decreases
Remains same
May increase or decrease ; depends on system
✅ The correct answer is option B.
7487. Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)
Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Decreases pressure drop, decreases surface area
✅ The correct answer is option C.
7488. For gas absorption, low viscosity solvents are preferred, because of their
Better flow characteristics
Low pumping pressure drop
Rapid absorption rates
All of the above
✅ The correct answer is option D.
7489. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
Range is 15°F
Approach is 10°F
Both A & B
Neither A nor B
✅ The correct answer is option C.