1. Consider the following statements : 1. Water hammer can develop in an unsteady flow only. 2. Time required for rapid closure of valve is between 2 L/C and 4 L/C where L is the pipe length and C is the celerity of wave. 3. In flexible water column theory, pipe may expand and water may compress in the flow system. 4. Joukowskyhas carried out the mathematical analysis of water hammer. Which is the above statements relating to water hammer in pipes are correct ?





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