In a membrane reactor for an equilibrium-limited reaction, what is the primary advantage?

The correct answer is B: Selective removal of products shifts equilibrium forward, increasing conversion. By selectively removing product through the membrane, the equilibrium constant expression is displaced, allowing conversion beyond the thermodynamic limit.

In a constant pressure calorimeter, 1 kg of water is heated from 25°C to 75°C. Heat absorbed is approximately (Cₚ of water = 4.18 kJ/kg·K):

The correct answer is B: 209 kJ. Q = m × Cₚ × ΔT = 1 × 4.18 × (75-25) = 1 × 4.18 × 50 = 209 kJ. At constant pressure, Q = ΔH.

For laminar flow inside circular tubes, the Nusselt number (Nu) is approximately constant at what value?

The correct answer is B: 4.36. For fully developed laminar flow in a circular tube with constant wall temperature (thermal entry), Nu ≈ 4.36. For constant heat flux, Nu ≈ 3.66. The question refers to the thermally developed region.

For a fluid flowing over a submerged object, the drag force is given by F_D = (1/2)ρV²AC_D. If velocity doubles and drag coefficient remains constant, drag force increases by a factor of:

The correct answer is B: 4. F_D ∝ V². When V doubles (V₂ = 2V₁), F_D increases by factor of (2)² = 4

The mass transfer rate from a solid sphere dissolving in a flowing liquid can be described using the Ranz-Marshall correlation. Which parameter is NOT included in this correlation?

The correct answer is C: Froude number. The Ranz-Marshall correlation for a sphere is Sh = 2 + 0.6 Re^(1/2) Sc^(1/3). Froude number (related to gravity effects) is not part of this correlation.

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Chemical Engineering

Process design, thermodynamics, reactions

133 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 131–133 of 133

Topics in Chemical Engineering

All Mass Transfer 100 Heat Transfer 100 Fluid Mechanics 100 Chemical Reaction Engineering 100 Thermodynamics 97

Q.131 Easy Mass Transfer

In the film theory of mass transfer, what is assumed about the concentration profile across the stagnant film?

A Linear concentration gradient

B Logarithmic concentration gradient

C Exponential concentration gradient

D Parabolic concentration gradient

Correct Answer: A. Linear concentration gradient

EXPLANATION

Film theory assumes a linear concentration gradient across the stagnant boundary layer, making the analysis mathematically simple and suitable for engineering calculations.

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Q.132 Easy Mass Transfer

What is the Schmidt number (Sc) in mass transfer? Select the most accurate definition.

A Sc = μ/(ρ × D_AB)

B Sc = ρ × D_AB/μ

C Sc = μ × D_AB/ρ

D Sc = ρ/μ × D_AB

Correct Answer: A. Sc = μ/(ρ × D_AB)

EXPLANATION

Schmidt number is Sc = kinematic viscosity/diffusivity = μ/(ρ × D_AB). It is a dimensionless number analogous to Prandtl number in heat transfer.

Test

Q.133 Easy Mass Transfer

Which of the following is the correct definition of mass transfer coefficient in a binary diffusion system?

A Rate of mass transfer per unit area per unit concentration difference

B Total molar flux divided by pressure gradient

C Diffusivity multiplied by viscosity

D Molecular weight ratio of components

Correct Answer: A. Rate of mass transfer per unit area per unit concentration difference

EXPLANATION

Mass transfer coefficient (k) is defined as the rate of mass transfer per unit interfacial area per unit concentration difference, with units of length/time.

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