Allied & ICAR Exam Bank • ALLIED_1313 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Dairy Unit Operations

Subtopic: Spray Dryer Mass Balance

Question Statement:

Concentrated milk having 45% total solids is fed to a spray dryer at 1000 kg/h to produce whole milk powder having 96% total solids (4% moisture). Neglecting powder handling losses, the production rate of milk powder in kg/h is:

Answer Key:

468.8

Step-by-Step Solution & Explanation

Solids balance: Feed Solids $=$ Powder Solids $\implies 1000 \times 0.45 = P \times 0.96 \implies 450 = 0.96 P \implies P = \frac{450}{0.96} = 468.75\text{ kg/h}$.
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