An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Less number of trays are required

More number of trays are required and the residue composition is more dilute in methanol

More number of trays are required but the residue composition remains unchanged

Composition of the residue remains unchanged

Less number of trays are required

More number of trays are required and the residue composition is more dilute in methanol

More number of trays are required but the residue composition remains unchanged

Composition of the residue remains unchanged

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

They are always equal under all circumstances

Lewis number is close to unity

Solubility of the components of air in water is very small

Water has a high latent heat of evaporation

They are always equal under all circumstances

Lewis number is close to unity

Solubility of the components of air in water is very small

Water has a high latent heat of evaporation

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Mass Transfer
Mass transfer co-efficient is defined as

None of the listed here

Flux = Co-efficient/concentration difference

Flux=concentration difference/co-effi-cient

Co-efficient = Flux/concentration difference

None of the listed here

Flux = Co-efficient/concentration difference

Flux=concentration difference/co-effi-cient

Co-efficient = Flux/concentration difference

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Mass Transfer
As the reflux ratio decreases, the

Separation becomes more efficient

Column diameter increases

None of these

Number of plates increases

Separation becomes more efficient

Column diameter increases

None of these

Number of plates increases

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Flow rate of inlet air

Humidity of inlet air

Temperature of the solid

Relative humidity of outlet air

Flow rate of inlet air

Humidity of inlet air

Temperature of the solid

Relative humidity of outlet air

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Mass Transfer
In a counter-current liquid extractor

Liquid's flow rate depends upon the temperature and pressure

Both liquids can have any desired flow rate

Both liquids flow at fixed rate

Only one of the liquids may be pumped at any desired rate

Liquid's flow rate depends upon the temperature and pressure

Both liquids can have any desired flow rate

Both liquids flow at fixed rate

Only one of the liquids may be pumped at any desired rate

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Mass Transfer

Mass Transfer For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Mass Transfer Mass transfer co-efficient is defined as

Mass Transfer As the reflux ratio decreases, the

Mass Transfer A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Mass Transfer In a counter-current liquid extractor

Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Mass Transfer
Mass transfer co-efficient is defined as

Mass Transfer
As the reflux ratio decreases, the

Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Mass Transfer
In a counter-current liquid extractor