Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III MINING OF DEEP-SEATED DEPOSITS Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the modern techniques of mineral exploration?
Answer
Modern mineral exploration techniques include remote sensing (satellite imagery and hyperspectral imaging), airborne geophysical surveys (magnetic, electromagnetic, and radiometric), geochemical sampling (soil, stream sediment, and biogeochemical), and advanced 3D geological modeling integrated with GIS.
What are the best geo-physical methods for coal exploration?
Answer
The most effective geophysical methods for coal exploration are seismic reflection surveys (for mapping seam continuity and structural disturbances), electrical resistivity tomography, and borehole logging (gamma-gamma and neutron-neutron logs) to determine coal seam thickness and quality.
List the Experimental trial methods for Coal deposits extraction.
Answer
Sign in to view the complete answer paper.
List the Continues miner technology stability analysis in Deep seated seam mines.
Answer
Sign in to view the complete answer paper.
List the geo-mechanical issues for deep mining.
Answer
Sign in to view the complete answer paper.
What is front abutment?
Answer
Sign in to view the complete answer paper.
What is a pressure bump?
Answer
Sign in to view the complete answer paper.
Define the terms “Convergence and Heave”.
Answer
Sign in to view the complete answer paper.
Why convergence caused in Underground mines?
Answer
Sign in to view the complete answer paper.
What is a bore hole extensometer?
Answer
Sign in to view the complete answer paper.
Part B
Explain the Geo-Chemical method of exploration.
Answer
Sign in to view the complete answer paper.
List causes of Coal seam deposit abnormalities.
Answer
Sign in to view the complete answer paper.
Explain the modern Seismic Exploration technique.
Answer
Sign in to view the complete answer paper.
Explain the Godavari valley coal field.
Answer
Sign in to view the complete answer paper.
List the challenges Associated With Mining of Deep seated Coal Seams.
Answer
Sign in to view the complete answer paper.
Explain the Failure criteria of rock burst in the coal pillars.
Answer
Sign in to view the complete answer paper.
State the problems causes parameters due to deep underground mines.
Answer
Sign in to view the complete answer paper.
Explain the Underground coal mining in India – Technological options and challenges ahead.
Answer
Sign in to view the complete answer paper.
What parameters influence the size and shape of a pillar in bord and pillar method of mining?
Answer
Sign in to view the complete answer paper.
The pillars of a bord and pillar panel are 25 m centre to centre with a gallery width of 4.8 m. Assume the height of the pillar to be 3.0 m. Estimate load acting on the pillar if the depth of the excavations are 200 m.
Answer
Sign in to view the complete answer paper.
A coal seam of 2.5 m thick, dipping at 1 in 14 and occurring at a depth of 200 m, is to be worked out by the Wongawilli system of working deploying continuous miner, shuttle cars, Alpine breaker line supports. Give a suitable layout of proposed method of working?
Answer
Sign in to view the complete answer paper.
What is shaft pillar? Explain its importance with reference to safety also explain the parameters that influence its design?
Answer
Sign in to view the complete answer paper.
Calculate the support requirement for an extraction of 3m thick coal seam with cavable roof. Bulking factor of roof rock = 1.2, Specific gravity of roof rock = 2.5Te/m3. Assume other conditions?
Answer
Sign in to view the complete answer paper.
Explain the method of estimation of roof load in an underground excavation.
Answer
Sign in to view the complete answer paper.
Explain the difference of continuum and Dis-continuum methods of numerical modeling.
Answer
Sign in to view the complete answer paper.
Describe briefly about ANSYS software.
Answer
Sign in to view the complete answer paper.
Explain the underground coal gasification at great depth.
Answer
Sign in to view the complete answer paper.
Describe the Flat jacks method of In-situ stress determination for Deep seam mines.
Answer
Sign in to view the complete answer paper.
Explain the procedure to measure and record convergence in an underground mine.
Answer
Sign in to view the complete answer paper.
Explain the term “Mineral bio-technology” its scope.
Answer
Sign in to view the complete answer paper.