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The time required to close a valve gradually is (where L is the length of pipe and C = velocity of pressure wave)

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The time required to close a valve gradually is (where L is the length of pipe and C = velocity of pressure wave) Answer: >2L/C

Question context

This question is part of 🚧 Civil Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.