In a coal mine district, air flows at a rate of 30 m3/s at a pressure of 1200 Pa. The density of air is 1.2 kg/m3. The mine management decided to reduce the flow rate of air to 20 m3/s using a regulator without changing the ventilation pressure. The area of regulator expressed in m2 will be
A. 0.99
B. 0.77
C. 0.71
D. 0.6
Answer: Option A
This Question Belongs to Mining Engineering >> Mine Ventilation
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