A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

1500

2500

2000

1000

1500

2500

2000

1000

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Calculated

Unknown

Known

Not required

Calculated

Unknown

Known

Not required

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De/t)1/2

(4De/t)

(De.t)1/2

(4De/πt)1/2

(De/t)1/2

(4De/t)

(De.t)1/2

(4De/πt)1/2

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Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Temperature

Total pressure

Composition

All of these

Temperature

Total pressure

Composition

All of these

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Hot water entering and the cooled water leaving the cooling tower

None of these

Hot water entering the tower and the wet bulb temperature of the surrounding air

Cold water leaving the tower and the wet bulb temperature of the surrounding air

Hot water entering and the cooled water leaving the cooling tower

None of these

Hot water entering the tower and the wet bulb temperature of the surrounding air

Cold water leaving the tower and the wet bulb temperature of the surrounding air

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Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Pressure falls

Pressure rises

Temperature falls

Temperature rises

Pressure falls

Pressure rises

Temperature falls

Temperature rises

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Mass Transfer

Mass Transfer For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Mass Transfer Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

Mass Transfer The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Mass Transfer The term "approach" in a cooling tower refers to the difference in the temperature of the

Mass Transfer The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the