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20 km long penstock pipe is connected to a tank at one end and a valve at another end to regulate the flow of water in pipe. Valve is closed suddenly and the velocity of pressure waves is 1000 m/s. Critical time (in seconds) for the closure of the valve is,
  • a)
    20
  • b)
    30
  • c)
    40
  • d)
    50
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
20 km long penstock pipe is connected to a tank at one end and a valve...
Critical time for closure of the valve = total time taken by pressure wave for travelling from the valve to the tank and from tank to valve.
Critical time (TC)= 2L/C
L = Distance travelled from valve to tank = 20 km
C = Velocity of pressure wave = 1000 m/s
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20 km long penstock pipe is connected to a tank at one end and a valve at another end to regulate the flow of water in pipe. Valve is closed suddenly and the velocity of pressure waves is 1000 m/s. Critical time (in seconds) for the closure of the valve is,a)20b)30c)40d)50Correct answer is option 'C'. Can you explain this answer?
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