Chemical Engineering - Mass Transfer

11. 

At 750°K and 1 atm, the approximate value of Schmidt number for air is

A. 0.01
B. 0.1
C. 1
D. 10

Answer: Option B

Explanation:

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12. 

Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

A. surface renewal
B. film
C. penetration
D. none of these.

Answer: Option B

Explanation:

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13. 

The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

A. NSc = 1
B. NSc = NPr = NLe
C. NPr = NLe
D. NSc = NLe

Answer: Option B

Explanation:

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14. 

For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m2 , a: in-terfacial area per unit volume of tower)

A.
B.
C.
D.

Answer: Option A

Explanation:

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15. 

Which of the following is used for the concentration of rubber latex ?

A. Agitated film evaporator
B. Long tube vertical evaporator
C. Short tube evaporator
D. Calendria

Answer: Option A

Explanation:

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