GATE Surface Environment, Mine Ventilation and Underground Hazards: Mine Ventilation – Previous Year Questions
22 GATE previous year questions on Mine Ventilation (Surface Environment, Mine Ventilation and Underground Hazards, Mining Engineering) with answers and explanations, from every paper.
- GATE 2021 MN Q29 – For geometrically similar fans, how does pressure scale with rotational speed n, impeller diameter D and air density ?
- GATE 2021 MN Q64 – A three-shift coal mine produces 400 t/day from panel A and 200 t/day from B, both with face OMS 1.0. Parallel-panel resistances are 0.6 and 0.5…
- GATE 2022 MN Q26 – Identify the WRONG statement about properly controlled air recirculation in an underground workplace. It can:
- GATE 2022 MN Q59 – An underground AC plant needs 250 US gpm of water at 7°C; 15.85 US gpm equals 1 L/s. Ice at 0°C (latent heat 334 kJ/kg) is mixed with 20°C water…
- GATE 2022 MN Q60 – An intake shaft 400 m deep has resistance 0.05 N s²/m⁸ and flow 100 m³/s. Average density is 1.2 kg/m³. Surface barometer reads 99.375 kPa; g=9.81…
- GATE 2023 MN Q33 – Increase roadway resistance by 1.5 N s²/m⁸ using a regulator. Find its opening area in m² to two decimals, using the conventional equivalent-orifice…
- GATE 2023 MN Q35 – A panel has 50 workers, each consuming oxygen at 2.5×10⁻³ m³/min. Intake oxygen is 20.95%. Find the ventilating air supply in m³/min needed to…
- GATE 2023 MN Q43 – An exhausting fan on a 0.60 m diameter duct carries 4.0 m³/s. Static pressure behind it is −97.5 mm water gauge. An outlet evasee has inlet-to-outlet…
- GATE 2023 MN Q64 – A main fan circulates 30 m³/s through parallel districts A and B. Resistances are RA=2.0 and RB=4.0 N s²/m⁸; the common intake and return each have…
- GATE 2024 MN Q13 – An airway 2.0 m wide and 2.5 m high turns throughπ/4 radians with 4.0 m bend radius. Find its empirical bend shock factor to three decimals.
- GATE 2024 MN Q37 – Four identical districts have total flow 3500 m³/min at stated fan-drift pressure 1.15 kPa. Sealing one raises resultant resistance by 0.072 N s²/m⁸.…
- GATE 2024 MN Q50 – A 2×2.5 m face in a 1000 m drive uses 20 kg explosive producing 2200 cm³ fumes/kg. The duct outlet is 10 m from the face. Find airflow Q in m³/s…
- GATE 2025 MN Q22 – A depillaring face has both dry- and wet-bulb temperatures of30°C. Find relative humidity in percent.
- GATE 2025 MN Q24 – Match fan-curve points P,Q,R to1 stall point,2 operating point,3 theoretical shut-off head.
- GATE 2025 MN Q32 – Airways of resistance4.0,6.25 and9.0 N s²/m⁸ are in parallel. Find equivalent resistance to two decimals.
- GATE 2025 MN Q40 – The airway is a rectangle topped by a semicircle of radius r. Its full perimeter is20 m and it carries fixed airflow. Which radius minimises mean air…
- GATE 2025 MN Q61 – Air flows at1.2 m/s through a900 m road of height2.5 m and width3 m. Friction coefficient is0.022 N s²/m⁴. Find friction pressure drop in Pa to three…
- GATE 2026 MN Q26 – What is the mining term for the gradually expanding duct fitted to an exhaust fan’s outlet?
- GATE 2026 MN Q33 – A500 m long circular airway of diameter5 m carries30 m³/s. With unchanged surface roughness and length, find diameter needed to double flow at the…
- GATE 2026 MN Q34 – A Kata thermometer takes60 s to fall from38°C to35°C. Its factor is480 millicalories/cm². Find cooling power in W/m², to one decimal.
- GATE 2026 MN Q40 – Two parallel ventilation districts A and B initially have common pressure drop ΔP and flows QA,QB. A booster increases B flow to Q′B while A flow…
- GATE 2026 MN Q52 – A mine fan generates25 mm water gauge and an aiding natural-ventilation pressure is15 mm water gauge, producing500 m³/min. With the same aiding…