GATE MN 2026 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

A bord and pillar panel has 24 developed pillars of size 40 m × 40 m (centre to centre) under extraction. The following information is given:

Gallery width = 4 m Extraction height = 3 m Extraction ratio during depillaring = 80% Specific gravity of coal = 1.4 Incubation period = 6 months Average working days per month = 25

In order to extract the panel within the incubation period, the minimum rate of production, in tonne per day, is ______________. (rounded off to one decimal place)

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Following observations were taken using a Tacheometer with staff held vertical. The additive and multiplying constants of the instrument are 0 and 100, respectively. The reduced level (RL) of the staff station R, in m, is _____________. (rounded off to two decimal places)

Instrument station P; staff stations Q and R. Staff readings at Q: 1.4, 2.7, 3.9; vertical angle: 7°; at R: 2.1, 2.8, 3.6; vertical angle: 5°. RL of Q = 102 m.

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A truss PQR carries vertical load of 10 kN at Q as shown. The force in member PR, in kN, is ________________. (rounded off to two decimal places)

Diagram for Mining Engineering question 63

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2026 · Paper 1

Question 61

Question 62

Question 63