The film penetration model of mass transfer was enunciated by

Penetration model (theory) for mass transfer was enunciated by

A

Danckwerts

B

Toor and Marchello

C

Higbie

D

Kissinevskii

Surface renewal model of mass transfer was enunciated by

A

Toor and Marchello

B

Fick

C

Danckwerts

D

Stefan

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.

A

CO₂

B

SO₂

C

NH₃

D

None of these

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

A

D

B

D²

C

D^0.5

D

$$\frac{1}{{\text{D}}}$$

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

A

Convection

B

Radiation

C

Conduction

D

Both convection and conduction

Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

A

K ∝ D

B

K ∝ $$\sqrt {\text{D}} $$

C

K ∝ D^1.5

D

K ∝ D²

Mr. Mamun bought 73 rolls of film. He can take 24 pictures with each roll of film. What is the total number of pictures he can take with 73 rolls of film ?

A

1,642

B

1,652

C

1,742

D

1,752

Which film has been awarded with best Environment film in 64th National film awards?

A

Kassav

B

Dashkriya

C

Ventilator

D

The tiger who crossed the line

Who enunciated the laws of planetary motion?

A

Nicolaus Copernicus

B

Johannes Kepler

C

Isaac Newton

D

Galileo

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

A

Calculated

B

Unknown

C

Known

D

Not required

The film penetration model of mass transfer was enunciated by

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