Question Bank • QB_SUB_DFE_DCM_002 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Heat and Mass Transfer

Subtopic: Diffusive and convective mass transfer

Question Statement:

In convective mass transfer across a boundary layer, if the Sherwood number $Sh = 80$, the characteristic length $L = 0.04\text{ m}$, and binary mass diffusivity $D_{AB} = 2.5 \times 10^{-5}\text{ m}^2\text{/s}$, the convective mass transfer coefficient $k_c$ (in m/s) is:

Answer Key:

0.05

Step-by-Step Solution & Explanation

Sherwood number definition: $Sh = \frac{k_c L}{D_{AB}}$ $k_c = \frac{Sh \cdot D_{AB}}{L} = \frac{80 \times (2.5 \times 10^{-5})}{0.04} = \frac{2.0 \times 10^{-3}}{0.04} = 0.05\text{ m/s}$
← Previous (QB_DFE_GATE_002) Next (QB_DFE_EXP_090) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test