Mass Transfer Questions and Answers – Non Dimensionless Correlation for Conve…

This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Non Dimensionless Correlation for Convective Mass Transport”.

1. Assume the following thermos-physical properties of air
D = 0.256 * 10 ^-4 m²/s
µ = 1.86 * 10 ^-5 kg/m s
c _p = 1.005 k J/kg degree Celsius
p _r = 0.701
p =1.165 kg/m³
Find the value of Schmidt number
a) 0.423
b) 0.523
c) 0.623
d) 0.723
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2. Air at 30°C flows at 45 m/s past a wet flat plate of length 0.5 m. Estimate the value of the mass transfer coefficient, assuming the water vapor content of air is initially negligible. The thermophysical properties of air are: diffusion coefficient D = 0.256 × 10^-4 m²/s, dynamic viscosity µ = 1.86 × 10^-5 kg/m·s, specific heat c_p = 1.005 kJ/kg·°C, Prandtl number Pr = 0.701, and density ρ = 1.165 kg/m³.
a) 0.1076 m/s
b) 0.2076 m/s
c) 0.3076 m/s
d) 0.4076 m/s
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3. Consider air at 30°C flowing past a wet flat plate at a velocity of 45 m/s and a plate length of 0.5 m. Given that the dynamic viscosity µ = 1.86 × 10^-5 kg/m·s and density ρ = 1.165 kg/m³, determine the Reynolds number for the flow.
a) 14.09 * 10 ⁸
b) 14.09 * 10 ⁷
c) 14.09 * 10 ⁶
d) 14.09 * 10 ⁵
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4. Assume the following thermos-physical properties of air
D =0.82 * 10 -6 m²/s
v = 15.5 * 10 -6 m²/s
Find the value of Schmidt number
a) 2.89
b) 1.89
c) 3.89
d) 0.89
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5. Air at 1 atm and 25 degree Celsius temperature, flows inside a 3 cm diameter tube with a velocity of 5.25 m/s. Determine mass transfer coefficient for iodine transfer from the air stream to the weak surface. Assume the following thermos-physical properties of air
D =0.82 * 10 -6 m²/s
v = 15.5 * 10 -6 m²/s
a) 0.0176 m/s
b) 1.0176 m/s
c) 2.0176 m/s
d) 3.0176 m/s
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6. Given the following parameters for iodine transfer from an air stream to a weak surface:
Air velocity = 5.25 m/s
Tube diameter = 3 cm
Diffusion coefficient (D) = 0.82 × 10^-6 m²/s
Kinematic viscosity (v) = 15.5 × 10^-6 m²/s
Find the value of the Sherwood number for this mass transfer process.
a) 84.44
b) 74.44
c) 64.44
d) 54.44
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7. The empirical correlation for local mass transfer coefficient for laminar boundary layer flow past a flat plate is given by
a) Sh _X = 0.332 (Re) ^0.5 (Sc) ^0.23
b) Sh _X = 0.332 (Re) ^0.5 (Sc) ^0.33
c) Sh _X = 0.332 (Re) ^0.5 (Sc) ^0.43
d) Sh _X = 0.332 (Re) ^0.5 (Sc) ^0.53
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8. The empirical correlation for local mass transfer coefficient for turbulent boundary layer flow past a flat plate is given by
a) Sh _X = 0.332 (Re) ^0.5 (Sc) ^0.33
b) Sh _X = 0.332 (Re) ^0.6 (Sc) ^0.33
c) Sh _X = 0.0298 (Re) ^0.7 (Sc) ^0.33
d) Sh _X = 0.0298 (Re) ^0.8 (Sc) ^0.33
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9. The expression for average mass transfer coefficient is
a) Sh = 0.664 (Re) ^0.5 (Sc) ^0.33
b) Sh = 0.664 (Re) ^0.6 (Sc) ^0.33
c) Sh = 0.332 (Re) ^0.7 (Sc) ^0.33
d) Sh = 0.332 (Re) ^0.8 (Sc) ^0.33
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10. Sherwood number is a function of
a) Lewis number and Reynolds number
b) Prandtl number and Lewis number
c) Reynolds number and Schmidt number
d) Schmidt number and Lewis number
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Sanfoundry Global Education & Learning Series – Mass Transfer.

To practice all areas of Mass Transfer, here is complete set of 1000+ Multiple Choice Questions and Answers.