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Percussion drilling is unsuitable in _______(a) unconsolidated sand(b) unconsolidated gravel(c) consolidated rocks(d) quick sand |
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Answer» Correct answer is (d) quick sand Easy explanation: Percussion drilling is a manual drilling technique in which a heavy cutting or hammering bit attached to a rope or cable is lowered in the open hole or inside a temporary casing. The technique is often also referred to as ‘Cable tool’. Usually a tripod is used to support the tools. |
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