A fan running at a speed of 280 rpm circulates 105 m3/s of air in a mine. If the power input to the motor for driving the fan is recorded to be 75 kW, with the combined efficiency of fan and motor at 70%. the fan pressure in Pa is
A. 50
B. 350
C. 500
D. 650
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Ventilation
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