Mass Transfer Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Mass Transfer ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Mass Transfer comprehensively.
2. The diffusivity of a constituent A in solution B has the units.
M/s
M2/s
M3/s
Kmol/(m2-s)
3. For steady-state molecular diffusion of gas A through non-diffusing B the ratio NA/(NA + NB) is
0
1
?
B
4. For steady-state equimolal counterdiffusion of two gases A and A the ration NA/(NA + NB) is
0
1
?
D
5. Methane is being cracked on a catalyst CH4?C + 2H2 under circumstances that CH4 (A) diffuses to the cracking surface and H2(B) diffuses back. At steady-state the ratio NA(NA + NB)is
?
1
?
2
6. The binary diffusivity in gases is dependent upon
The temperature
The pressure
The nature of components
All of the above
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7. The binary diffusivity in gases varies almost as where T = absolute temperature of the system
T
T1/2
T3/2
T2
8. The binary diffusivity in gases varies
Directly as the pressure
Inversely as the pressure
Inversely as the square root of pressure
Directly as the square root of pressure
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9. The binary diffusivity in gases at atmospheric conditions is of the order of
10-1 cm2/sec
10-5 cm2/sec
105 cm2/sec
10-7 cm2/sec
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10. The binary diffusivity in liquids is of the order of
10-5 cm2/sec
10-5 m2/sec
10-5 mm2/sec
10-5 ft2/sec
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11. The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is linear
In the case of steady-state equimolal counter-diffusion
In the case of steady-state unimolal unidirectional diffusion
Both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion
A
12. The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is non-linear
In the case of steady-state equimolal counter-diffusion
In the case of steady-state unimolal unidirectional diffusion
Both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion
B
13. The diffusivity DAB for A diffusing in B is the same as the fiffusivity DBA for B diffusing in A for a binary mixture of
Ideal gases only
Real gases only
Both ideal and real gases
Real liquids only
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14. At steady-state the partial pressure distribution of an ideal gas A diffusing through a stagnant ideal gas B follows
Linear law
Hyperbolic law
Parabolic law
Exponential law
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15. Select the wrong statement
Molecular diffusion in solids is much faster than molecular diffusion in gases and liquids
Molecular diffusion in solids is much slower than molecular diffusion in gases and liquids
The diffusion coefficient in a liquid is 10-4 to 10-5 times times the diffusion coefficient in a gas
Molecular diffusion in gases is much faster than molecular diffusion in liquids
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