Chemical Engineering - MCQ Practice Questions

In gas-solid adsorption, the Langmuir isotherm assumes:

For simultaneous diffusion and reaction (fast reaction regime) in a porous catalyst, the effectiveness factor η approaches:

In hollow fiber membrane contactors for gas absorption, the advantage over conventional columns is:

The correlation for mass transfer coefficient in agitated vessels (Harriott equation) is k_L·a ∝:

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

The flux N_A for component A diffusing through stagnant B can be expressed using:

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

The effective diffusivity in porous solids is given by the Knudsen diffusion model when:

In evaporative cooling, the heat and mass transfer are coupled. The Lewis number (Le) relationship between them is:

For a gas diffusing into a liquid droplet, the internal circulation (if present) causes:

In industrial scale-up of absorption columns, the L/G ratio (liquid to gas ratio) is adjusted to:

For membrane distillation with a hydrophobic membrane, the mass transfer resistance in the gas phase across the membrane pores is overcome by:

For a long thin fin with adiabatic tip condition, the fin efficiency is given by:

In a parallel plate channel with constant heat flux q'' on both walls, what is the thermal entrance length relationship with hydrodynamic entrance length?

The Graetz number in laminar heat transfer represents:

Which statement best describes radiation heat transfer in participating media?

For a microfin tube (enhanced surface), the heat transfer improvement comes primarily from:

In a counter-flow double pipe heat exchanger, the outlet temperature of hot fluid becomes lower than the outlet temperature of cold fluid. This is:

For radiation heat exchange between two parallel plates at temperatures T₁ and T₂ with emissivities ε₁ and ε₂, the radiation heat transfer is reduced by factor:

For boiling heat transfer, the critical heat flux (CHF) depends on which property most strongly?