Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Rotary dryer is suitable for drying sticky material

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Rotary dryer is suitable for drying sticky material

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Avoid flooding

Reduce liquid hold up

Avoid channeling

Minimise the overall pressure drop

Avoid flooding

Reduce liquid hold up

Avoid channeling

Minimise the overall pressure drop

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Mass Transfer
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Increase

Decrease

Data insufficient, can't be predicted

Remain same

Increase

Decrease

Data insufficient, can't be predicted

Remain same

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Mass Transfer
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

Sherwood

Lewis

None of these

Grashoff

Sherwood

Lewis

None of these

Grashoff

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Mass Transfer
During the constant rate period of drying of a solid,

Increased air humidity decreases the rate of drying

None of these

Increasing the air temperature decreases the drying rate

Surface evaporation of unbound moisture occurs

Increased air humidity decreases the rate of drying

None of these

Increasing the air temperature decreases the drying rate

Surface evaporation of unbound moisture occurs

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Mass Transfer
Ion exchange process is similar to

Absorption

Adsorption

Leaching

Extraction

Absorption

Adsorption

Leaching

Extraction

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Mass Transfer

Mass Transfer Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer The main reason for dividing a tall packed tower into series of small towers is to

Mass Transfer For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Mass Transfer In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

Mass Transfer During the constant rate period of drying of a solid,

Mass Transfer Ion exchange process is similar to

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Mass Transfer
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Mass Transfer
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.

Mass Transfer
During the constant rate period of drying of a solid,

Mass Transfer
Ion exchange process is similar to