Allied & ICAR Exam Bank • ALLIED_0767 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Dairy Unit Operations

Subtopic: Dairy Unit Operations

Question Statement:

Concentrated whole milk with $48\%\text{ total solids}$ enters a spray dryer at rate $\dot{m}_{feed} = 1000\text{ kg/h}$. Total dry solids mass flow rate is $1000 \times 0.48 = 480\text{ kg/h}$. If the resulting milk powder has $4\%\text{ moisture}$ ($96\%\text{ solids}$), the powder production rate $\dot{m}_{powder} = 480 / 0.96$ in kg/h is:

Answer Key:

500

Step-by-Step Solution & Explanation

$\dot{m}_{powder} = 480 / 0.96 = 500.0\text{ kg/h}$.
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