GATE MN topic:mine-ventilation PYQs & Answers — Page 4

Questions 31–37 of 37. Imported answers require independent review unless marked reviewed.

The main surface fan of a mine as shown in the figure, has characteristic curve approximated by

, where P is pressure in Pa and Q is quantity in m

/s. A booster fan is installed in section A such that there is no air flow in section B. The operating pressure of the main surface fan, in Pa, (rounded off to two decimal places) is

Diagram for Mining Engineering question 42

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Considering ‘I’ as ‘intake’ and ‘R’ as ‘return’, the ventilation symbol for the shaft-bottom air-lock in a coal mine is

Your answerChoose one option.

Diagram for Mining Engineering question 12

Diagram for Mining Engineering question 12 (figure 2)

Diagram for Mining Engineering question 12 (figure 3)

Diagram for Mining Engineering question 12 (figure 4)

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The temperature profiles and the plume patterns that are most likely to result are given in the figures. The dotted line represents ‘adiabatic lapse rate’ and the bold line represents ‘environmental lapse rate’. The WRONG combination is

Your answerChoose one option.

Diagram for Mining Engineering question 14

Diagram for Mining Engineering question 14 (figure 2)

Diagram for Mining Engineering question 14 (figure 3)

Diagram for Mining Engineering question 14 (figure 4)

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A panel in coal mine produces 400 tonne per day. The number of persons employed in each of the three shifts is 110, 130 and 120. As per CMR, the minimum quantity of air that needs to be circulated at the last ventilation connection of the panel in

Your answerChoose one option.

780

900

1000

2400

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A portion of a ventilation system has two splits as shown. Split ‘A’ has a resistance of

and a regulator of size 2.0

. The resistance of split ‘B’ in

is _________.

Diagram for Mining Engineering question 37

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In a mine, 200 and 250 persons are deployed in the Panels A and B (shown in figure) respectively in the largest shift.

Diagram for Mining Engineering question 48

The panels produce 400 and 500 tonne/day respectively. The resistances of panels A and B are 0.3 Ns²m⁻⁸ and 0.4 Ns²m⁻⁸ respectively and the combined resistance of shaft and trunk airways is 0.5 Ns²m⁻⁸. The operating static pressure of the fan in Pa to provide the minimum air quantities in the panels as per CMR 1957 is ________

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In an auxiliary ventilation system, a fan is installed inside a 100 m long and 600 mm diameter duct to ventilate a blind heading face. The frictional coefficient of the duct is 0.0066 Ns²m⁻⁴ and the static pressure characteristic of the fan is represented by:

where,

is in Pa and Q is in m³/s. The quantity of air delivered by the fan in m³/s is ________

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GATE MN topic:mine-ventilation PYQs

Question 42

Question 12

Question 14

Question 30

Question 37

Question 48

Question 49