While measuring average air velocity of air flowing through a circular duct using precise traversing with equal area method, the radii r1, r2 and r3, in mm, as shown in the figure of the three circles should be
A. 83, 167 and 240
B. 36, 107 and 261
C. 102, 177 and 228
D. 108, 157 and 216
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Ventilation
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