JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year DRILLING AND BLASTING Previous Question Paper (April - 2018 - R16)
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
What is the fishing of bore hole?
Answer
Fishing of a borehole refers to the recovery of lost or stuck drilling tools, drill strings, or other equipment that has become detached or trapped within the borehole during drilling operations.
List the various type of drilling equipment.
Answer
The various types of drilling equipment include:
- Percussive drills (Jackhammers, Drifters)
- Rotary drills (Tri-cone bits, Drag bits)
- Rotary-percussive drills (Down-the-hole hammers)
- Diamond core drills
- Auger drills
What is the uses of Drill rods?
Answer
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Define the term drillability.
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What is the term detonating cords?
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What are the blast patterns designs?
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What is solid Blasting?
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What are the Blasting agents?
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Define the term fumes in open pit blasting.
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Write a short note on dimensional stone blasting.
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Part B
What are the various types of drilling equipment used in mining industry? Explain about the operation and maintenance of Rotary Drilling with a diagram.
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What is core recovery? How are you going to recover the core form Single tube core barrel? Explain with a neat diagram?
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What is production drilling? What are different types of production drilling equipment used in mines? Explain about drill machines used in blasting gallery method in coal mines? Give the parametric performance of the drill?
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What is the purpose of doing production drilling? How you are going to do rotary drilling with a neat sketch? What are the precautions you need to take while drilling?
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Explain about the following:
Drillability & Drilling Index
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Factors affecting drilling
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drill hole economics.
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What are the different kind of accessories available for blasting in mines? Explain each one of them in brief.
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Define Misfires. In which conditions the misfires can happen? What are the statutory precautions that can be taken to prevent Misfires?
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What is an accident? What are different kinds of accidents that can take place due to blasting in opencast mines? Explain about the preventive measures.
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What are different kinds of blasting in opencast mines? Explain about primary blasting and secondary blasting in opencast mines.
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What is trench cutting? What are the precautions we need to take while doing French cutting in hard rocks?
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