Chemical Engineering · all questions

Mass Transfer
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Q121

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

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Q122

For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

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Q123

Extraction of pencillin employs a __________ extraction coloumn.

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Q124

The relative volatility of a binary mixture at constant temperature __________ the total pressure.

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Q125

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/k_y.C_z is around

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Q126

The surface renewal frequency in Danckwerts model of mass transfer is given by (K_L: mass transfer co-efficient)

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Q127

Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

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Q128

Pick out the correct statement.

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Q129

Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10^-3 kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m².s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is

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Q130

Small dia distillation column can be a

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Q131

Flights in a rotary dryer are provided to

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Q132

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m².hr. The equilibrium data is represented by Y = 3X², where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

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Q133

__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

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Q134

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

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Q135

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

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Q136

All moisture in a non-hygroscopic material is the __________ moisture.

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Q137

In physical terms, Schmidt number means

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Q138

In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

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Q139

Which of the following assumes constant molal vaporisation and overflow?

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Q140

The wetted wall tower is used to determine

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