GATE 2026 MN – Question 52

Surface Environment, Mine Ventilation and Underground Hazards · Mine Ventilation · 2 marks · Numerical answer

A mine fan generates25 mm water gauge and an aiding natural-ventilation pressure is15 mm water gauge, producing500 m³/min. With the same aiding natural pressure, what fan pressure is needed for1000 m³/min? Give an integer.

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Correct answer: 145 to 145

Explanation

Initially the airway friction loss is25+15=40 mm water gauge. At unchanged resistance, doubling flow multiplies friction pressure by four, requiring160 mm total. Natural ventilation still supplies15, so the fan must supply160−15=145 mm water gauge.

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