Allied & ICAR Exam Bank • ALLIED_1293 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Psychrometry and Grain Drying

Subtopic: Humid Volume

Question Statement:

The humid volume $v_H$ (m$^3$ of moist air per kg of dry air) at dry bulb temperature $T = 27^\circ\text{C}$ (300 K) and humidity ratio $w = 0.010\text{ kg/kg dry air}$ under standard atmospheric pressure ($101.325\text{ kPa}$) is (taking gas constant for dry air $R_{air} = 287\text{ J/(kg}\cdot\text{K)}$):

Answer Key:

0.863

Step-by-Step Solution & Explanation

$v_H = 0.8497 \times (1 + 1.608 \times 0.010) = 0.8497 \times (1 + 0.01608) = 0.8497 \times 1.01608 \approx 0.8634\text{ m}^3/\text{kg dry air}$.
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