GATE MN Mine Ventilation PYQs & Answers — Page 2

Questions 11–20 of 37. Imported answers require independent review unless marked reviewed.

In a longwall panel, air flows at a velocity of 1.2 m/s through a 900 m long gate road of 2.5 m height and 3 m width. The coefficient of friction is 0.02 Ns²m⁻⁴. The frictional pressure drop, in Pa, between two ends of the gate road is ____ (rounded off to 3 decimal places)

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A rectangular mine airway of 2.0 m width and 2.5 m height has a bend with deflection of

radian. If the radius of curvature of the bend is 4.0 m, the shock factor of the bend is (round off to three decimals)

Your answerChoose one option.

0.014

0.024

0.051

0.071

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Four identical districts of a mine are ventilated with a quantity of 350 m

/min at a fan drift pressure of 1.15 kPa. When one of the districts is sealed off, the change in resultant resistance is 0.072 Ns

. If the fan is stopped, keeping a district sealed, the quantity through the mine becomes 850 m

/min. The natural ventilation pressure in Pa, is

Your answerChoose one option.

72.12

82.28

105.56

144.56

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A rectangular face of 2.0 m × 2.5 m dimension is blasted with 20 kg explosive in a 1000 m long drive. One kilogram of explosive produces 2200 cm³ of nitrous fumes. The face is ventilated with a duct, located 10.0 m away from the face, to dilute the fumes. The quantity of air, in m³/s to be circulated for reducing the concentration of nitrous fumes to 5 ppm within a period of 5 minutes, is ____. (round off up to 2 decimals)

[Use the relation,

, where t = time,

= volume of the tunnel over which the mixing of the gases produced at the face and air delivered by the fan occurs, c = concentration at time t, V = volume of tunnel, Q = quantity of air flow, q = total volume of nitrous fumes produced]

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To increase the resistance of a mine roadway by 1.5 Ns² m⁻⁸, the size in m² of the regulator to be installed is _____. [rounded off to 2 decimal places]

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In a panel with 50 workers, a miner typically consumes 2.5 × 10⁻³ m³/min of oxygen. The percentage of oxygen in the intake air is 20.95%. To ensure minimum permissible oxygen in the return air as per CMR 2017 the quantity of ventilation air in m³/min to be supplied to the panel is_____. [rounded off to 2 decimal places]

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A duct of diameter 0.60 m with an exhausting fan has −97.5 mm wg static pressure behind the fan when the air flow rate is 4.0 m³/s. If an evase with inlet to outlet area ratio of 1:4 and efficiency 60% is attached to the outlet of the fan, the static pressure of the fan in mm of wg becomes

Your answerChoose one option.

−104.26

−99.13

−90.73

−80.6

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A fan installed in a line ventilation system circulates 30 m³/s of air to two districts A and B as shown in Figure below. It is desired to increase the quantity of air by 20% in the district B using a booster fan in it. Assuming that the main fan pressure is unchanged, the pressure of the booster fan, in Pa, is _____.

[rounded off to 2 decimal places]

Diagram for Mining Engineering question 64

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If the ambient lapse rate is higher than the dry adiabatic lapse rate, the atmosphere is

Your answerChoose one option.

stable

neutral

unstable

strongly stable

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Identify the WRONG statement: The application of controlled air recirculation in an underground work place can

Your answerChoose one option.

increase the air velocity at the work place

lead to increased concentration of contaminants in the work place

require the installation of an additional fan in the system

lead to overall ventilation cost savings

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GATE MN Mine Ventilation PYQs

Question 61

Question 13

Question 37

Question 50

Question 33

Question 35

Question 43

Question 64

Question 25

Question 26