Question Bank • QB_DFE_EXP_088 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Pasteurization

Question Statement:

In an HTST pasteurizer operating at a milk flow rate of $3600\text{ L/h}$ ($0.001\text{ m}^3/\text{s}$), the holding tube must provide a minimum legal holding time of $15.0\text{ seconds}$. Calculate the required holding tube volume in $\text{liters}$.

Answer Key:

15

Step-by-Step Solution & Explanation

Flow rate per second: $Q = \frac{3600\text{ L}}{3600\text{ s}} = 1.0\text{ L/s}$ Required holding volume: $V = Q \times t_{\text{hold}} = 1.0\text{ L/s} \times 15.0\text{ s} = 15.0\text{ liters}$
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