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%. If the fan pressure is to be increased by 200 Pa by changing the fan speed. the fan speed in rpm will become
A. 768
B. 549
C. 392
D. 332
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Ventilation
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