Mining Engineering
2024 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE MN 2024 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.
Question 49
Open questionMNNAT2 marksNeeds review
The data obtained from an air sample analysis of an old working in a coal mine are given.
O₂ 17.15%, CO₂ 3.40%, CH₄ 2.20%, and N₂ 77.25%.
Considering atmospheric air contains
O₂ 20.95%, CO₂ 0.03%, and N₂ 79.2%,
the percentage of blackdamp in the old working, is __. (round off up to 2 decimals)
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 50
Open questionMNNAT2 marksNeeds review
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]Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 51
Open questionMNNAT2 marksNeeds review
Data for a centrifugal pump discharging water from a sump to the surface are given.
Head, m : 180
Discharge rate, m
/hr : 320
Operating hours per day for 270 days in a year : 14
Operating hours per day for remaining 95 days : 20
Overall efficiency of the pump system : 0.70
Specific weight of mine water, kN/m
: 10.20The annual electrical power consumption in GWh, due to pumping operation, is _____. (round off up to 2 decimals)
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer