JNTU
JNTU B.Tech II DRILLING AND BLASTING Previous Question Paper (December - 2017 - R13)
Note: This question paper contains two parts A and B. 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. Each question carries 10 marks and may have a, b, c as sub questions.
PART A
List the different methods of core recovery.
Answer
The primary methods of core recovery include wireline drilling, conventional core barrel drilling, and triple-tube core barrel systems used for soft or fractured formations.
What is fishing of bore hole?
Answer
Fishing in a borehole refers to the recovery of lost or stuck drilling tools, drill strings, or equipment from the hole. It involves using specialized tools known as 'fishing tools' to retrieve the debris or lost items to restore drilling operations.
What are the different types of drill rods used in underground mining?
Answer
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What are the precautions to be taken during transportation of explosives on surface?
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What are the various tests to be conducted for determining the explosive performance?
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How do you store the explosives and detonators in underground district?
Answer
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List any four types of drill/blast patterns for underground face.
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What is blown out shot and blown through shot?
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What is secondary blasting?
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What is deck charging in opencast blasting?
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PART B
Explain the method of wire line drilling with a neat sketch along with its applicability.
Answer
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What is bore hole surveying? Explain the method of bore hole logging.
Answer
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Explain the method of Rotary Percussive drilling with a neat sketch.
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What are the various physic-mechanical factors affecting drillability?
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What is an explosive? What are the properties affecting choice of explosives?
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Explain the method of blasting using Nonels in opencast blasting with a representative sketch.
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What is induced blasting?
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Explain the method of induced blasting in underground coal mine.
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What is a misfire? Explain the process of dealing the misfire in underground mines.
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What are the environmental impacts due to blasting?
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What are the precautions to be taken to reduce damage to environment due to blasting in opencast mines?
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What is secondary blasting in opencast mines? What is the need of secondary blasting?
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What are the various methods of secondary blasting? Explain each one with a neat sketch.
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