JNTU
JNTU B.Tech II DRILLING AND BLASTING Previous Question Paper (April - 2018 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Briefly mention the importance of drilling operations in mining and construction.
Answer
Drilling is the primary operation in mining and construction used to create boreholes for placing explosives. It is essential for fragmenting rock mass efficiently, controlling the geometry of excavations, and ensuring safety and productivity in subsequent blasting operations.
List the various type of drilling equipments.
Answer
Drilling equipment is broadly categorized into:
- Percussive drills (Jackhammers, Drifters, Wagon drills)
- Rotary drills (Auger drills)
- Rotary-percussive drills (Down-the-hole drills, Top hammer drills)
- Jet piercing drills
Define Drillability of rock.
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State the mechanics of drilling.
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Define the term Detonators.
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Define the term Exploders.
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Define the term Ring blasting.
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List the statuary requirement of Blasting.
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List the environmental impact due to blasting.
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Explain the term Secondary Blasting.
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Part B
Describe the differences between the Double tube core barrels and wire line core barrels.
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List the limitation of Core recovery.
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Specify the importance of core logging in drilling operation.
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Explain the process of Directional drilling?
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Explain the Process of rotary drilling method with neat sketches and mention its applications.
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The density of rock is 2.4 g/cm and the diameter of the chips produced during the drilling 0.6 mm. Determine the bailing velocity (m/s) required to remove the chips from the hole?
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List the causes of Drill bit wear.
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Discuss the applicability and limitations for SMS and EMS.
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List the purpose of Relays.
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Discuss the composition of different detonator with sketch.
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Describe the term Safety Fuse.
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Explain the method and application of Drag Cut with neat sketch.
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List the precaution against mis-fire.
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List the precautions against the dangers due to blasting below ground.
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Explain the method and application of Wedge cut.
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Explain in detail about Controlled blasting.
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Describe any one method in detail with neat sketches.
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Describe the Dimensional stone blasting.
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List the Preventive measures for fly rocks.
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