Mass Transfer

Question: If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.
[A].

a1 = a2

[B].

a1 = 2a2

[C].

a1 = 0.5 a2

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Penetration model (theory) for mass transfer was enunciated by
[A].

Danckwerts

[B].

Toor and Marchello

[C].

Higbie

[D].

Kissinevskii

Answer: Option C

Explanation:

No answer description available for this question.

Question: A good solvent used for absorption should not have very high
[A].

viscosity

[B].

vapor pressure

[C].

freezing point

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are
[A].

parallel

[B].

straight

[C].

both parallel and straight

[D].

neither parallel nor straight

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ diffusion is used for separating the isotopes of methane.
[A].

Thermal

[B].

Pressure

[C].

Concentration

[D].

Force

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: Minimum possible diameter of a packed coloumn is decided mainly by the
[A].

flooding

[B].

gas viscosity

[C].

liquid density

[D].

liquid hold up

Answer: Option A

Explanation:

No answer description available for this question.

Question: Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
[A].

less than

[B].

more than

[C].

same as

[D].

very much less

Answer: Option B

Explanation:

No answer description available for this question.

Question: Drying of refractory is normally carried out in a __________ dryer.
[A].

open pan

[B].

tray

[C].

rotary vacuum

[D].

truck/tunnel.

Answer: Option D

Explanation:

No answer description available for this question.