Allied & ICAR Exam Bank • ALLIED_0602 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Psychrometry and Grain Drying

Subtopic: Psychrometry and Grain Drying

Question Statement:

At standard atmospheric pressure $P = 101.3\text{ kPa}$, moist air has water vapor partial pressure $P_v = 2.0\text{ kPa}$. The dry air partial pressure is $P - P_v = 101.3 - 2.0 = 99.3\text{ kPa}$. Specific humidity $\omega = 0.622 \times \frac{2.0}{99.3}$ in kg water / kg dry air is (rounded off to four decimal places):

Answer Key:

0.0125

Step-by-Step Solution & Explanation

$\omega = 0.622 \times \frac{2.0}{99.3} = 0.622 \times 0.020141 = 0.012527\text{ kg/kg} \approx 0.0125$.
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