For a multicomponent gas mixture undergoing absorption with selective removal, the flux of component i is affected by:

The correct answer is B: Gradients of all species and their mutual interactions. In multicomponent systems, the Stefan-Maxwell equations govern diffusion, showing that fluxes depend on concentration gradients of all species and their binary diffusivity interactions.

Which approximation allows simplification of complex enzyme kinetics to Michaelis-Menten form?

The correct answer is C: Both A and B are valid under different conditions. Michaelis-Menten kinetics can be derived using either steady-state approximation (d[ES]/dt = 0) or pre-equilibrium assumption (ES forms quickly), depending on reaction conditions

A rotameter (variable area flowmeter) is used for gas flow measurement. The float rise in the tube depends on which factor?

The correct answer is B: Both viscosity and density of the gas. Rotameter float position equilibrium depends on drag force, buoyancy, and weight - all affected by fluid viscosity and density

In a packed column used for gas absorption, the NTU (Number of Transfer Units) approach is preferred over HTU when:

The correct answer is C: The gas and liquid flow rates are both variable. NTU accounts for changing concentrations along the column height and is more versatile for varying flow rates, while HTU is better for constant flow conditions with linear equilibrium.

The Weisz-Prater criterion is used to determine:

The correct answer is A: Whether internal mass transfer limitations exist in catalytic reactions. Weisz-Prater number: CWP = (k''ρcRp²)/De. If CWP

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Chemical Engineering
Fluid Mechanics

Process design, thermodynamics, reactions

33 Q 5 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–33 of 33

Topics in Chemical Engineering

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

Q.31 Easy Fluid Mechanics

Which equation relates pressure drop to velocity in laminar flow through pipes?

A Hagen-Poiseuille equation

B Darcy-Weisbach equation

C Fanning friction factor equation

D Colebrook-White equation

Correct Answer: A. Hagen-Poiseuille equation

EXPLANATION

Hagen-Poiseuille equation (ΔP = 32μLV/D²) is specific for laminar flow. Darcy-Weisbach is general for both laminar and turbulent flows.

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Q.32 Easy Fluid Mechanics

A fluid flows through a pipe of diameter 0.1 m with velocity 2 m/s. If the kinematic viscosity is 1×10⁻⁶ m²/s, calculate the Reynolds number.

A 2×10⁵

B 2×10⁴

C 2×10³

D 2×10²

Correct Answer: A. 2×10⁵

EXPLANATION

Re = (ρVD)/μ = VD/ν. Re = (2 × 0.1)/(1×10⁻⁶) = 0.2/(1×10⁻⁶) = 2×10⁵. Flow is turbulent.

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Q.33 Easy Fluid Mechanics

Which of the following is the SI unit of kinematic viscosity?

A m²/s

B kg/(m·s)

C N·s/m²

D Pa·s

Correct Answer: A. m²/s

EXPLANATION

Kinematic viscosity is dynamic viscosity divided by density. Its SI unit is m²/s (or Stokes in CGS, where 1 Stoke = 10⁻⁴ m²/s).

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