Mining Engineering
GATE MN topic:underground-hazards PYQs
Build your understanding with focused practice from past exam papers.
How to practice topic:underground-hazards
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 31. Imported answers require independent review unless marked reviewed.
Question 27
Open questionMNMCQ1 markNeeds review
The cobweb-like appearance in the radiograph of the lung of a miner can be diagnosed as
Your answerChoose one option.
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 28
Open questionMNMCQ1 markNeeds review
In firedamp explosion, the methane concentration in the stoichiometric methane-air mixture, in % by volume, is
Assume the air contains 79 % nitrogen and 21 % oxygen, by volume.
Your answerChoose one option.
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 45
Open questionMNNAT2 marksNeeds review
A closed-circuit self-contained breathing apparatus (SCA) contains 2 liters of O
at 200 bar. If a miner consumes O
at a rate of 2 liters min
, the maximum duration that the apparatus can supply O
, in min, is ____________. (answer in integer)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 61
Open questionMNNAT2 marksNeeds review
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)
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 23
Open questionMNMCQ1 markNeeds review
The chemicals used in a foam type fire extinguisher are
Your answerChoose one option.
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 25
Open questionMNMCQ1 markNeeds review
As per CM 2017, haulage ropes shall be recapped once at least in every
Your answerChoose one option.
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 11
Open questionMNMCQ1 markNeeds review
Exposure to loud impulsive noise may lead to
Your answerChoose one option.
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 12
Open questionMNMCQ1 markNeeds review
In a self-contained closed-circuit breathing apparatus,
Your answerChoose one option.
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 14
Open questionMNMCQ1 markNeeds review
In an underground coal mine, two fatalities and three serious bodily injuries occurred during the year 2022. The average daily employment is 1100 and annual working days is 300. The severity index as per DGMS guideline for the mine is
Your answerChoose one option.
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 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 answer