A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

The top and bottom compositions are unchanged with and without total reflux

Reboiler load and condenser load are minimum

The top and bottom compositions correspond to the maximum enrichment available

Composition of vapors and that of liquid do not vary throughout the column

The top and bottom compositions are unchanged with and without total reflux

Reboiler load and condenser load are minimum

The top and bottom compositions correspond to the maximum enrichment available

Composition of vapors and that of liquid do not vary throughout the column

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

> 4 :1

< 8 : 1

> 8:1

< 6:1

> 4 :1

< 8 : 1

> 8:1

< 6:1

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Prandtl number for water at 20°C is about

150

0.7

70

7

150

0.7

70

7

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Reboiler is considered as one theoretical plate, because

Reboiler itself contains one plate

None of these

Vapour is recycled to the column

Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

Reboiler itself contains one plate

None of these

Vapour is recycled to the column

Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
To get high tray efficiency

Gas velocity should be very low

Interfacial surface between liquid and gas phase should be large

Time of contact between the two phases should be less

Liquid entrainment should be severe

Gas velocity should be very low

Interfacial surface between liquid and gas phase should be large

Time of contact between the two phases should be less

Liquid entrainment should be severe

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

Total pressure is less

Saturated steam is used for steam distillation

Temperature is less

Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

Total pressure is less

Saturated steam is used for steam distillation

Temperature is less

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer

Mass Transfer A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Mass Transfer In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Mass Transfer Prandtl number for water at 20°C is about

Mass Transfer Reboiler is considered as one theoretical plate, because

Mass Transfer To get high tray efficiency

Mass Transfer In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Mass Transfer
Prandtl number for water at 20°C is about

Mass Transfer
Reboiler is considered as one theoretical plate, because

Mass Transfer
To get high tray efficiency

Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because