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Question Detail
Surge tank is for the protection of
Options
Option A: Dam
Option B: Spillways
Option C: Penstock
Option D: Headworks
Correct Answer
Penstock
Solution & Explanation
{"type":"technical","methodBadge":"Concept & Principle","explanation":"A surge tank is a small reservoir or tank placed at the end of the penstock or near the turbine to protect the penstock from 'water hammer' pressure effects. It acts as a pressure relief mechanism by absorbing sudden surges of water or providing water during load demand fluctuations.","workingPrinciple":"When the turbine load suddenly decreases, the governor closes the gates, causing a rapid stoppage of water flow. This creates high-pressure waves (water hammer) that could burst the penstock; the surge tank provides a relief path, allowing the water level to rise in the tank instead of hitting the penstock walls. Conversely, during sudden load increases, the surge tank supplies the initial surge of water, preventing negative pressure (cavitation) in the penstock.","diagramSvg":"ConduitSurge TankPenstock","keyFormulas":["$h_w = \\frac{L \\cdot v}{g \\cdot t}$ тАФ approximate pressure head rise due to water hammer ($L$=length, $v$=velocity, $t$=closing time)","$P = \\rho \\cdot g \\cdot Q \\cdot H$ тАФ power output relation where surge tank maintains steady $H$"],"keyPoints":["Prevents water hammer effect in long penstocks.","Improves turbine speed regulation by acting as a supplementary water source.","Usually placed as close to the powerhouse as possible.","Essential in high-head and medium-head hydro power plants."],"advantages":["Protects penstock from bursting due to pressure surges","Provides quick response to load changes","Prevents penstock collapse under negative pressure"],"disadvantages":["High initial construction cost","Requires significant maintenance and structural monitoring"],"applications":["Hydroelectric power stations with long pressure conduits","Pumped storage systems"],"comparisonTable":[],"additionalInfo":["Water hammer is the phenomenon of pressure oscillation caused by the rapid change in water velocity.","Option A (Dam) is a storage structure, not a protection device for flow conduits. Option B (Spillways) are safety valves for dams, not penstocks."],"answer":"C is correct тАФ The surge tank is specifically designed to mitigate water hammer pressure waves within the penstock during rapid flow changes.","correctedOptions":["Dam","Spillways","Penstock","Headworks"],"coreConcepts":["Water Hammer Effect","Hydroelectric Power Plant Hydraulics","Pressure Transient Mitigation"],"crossTopicTip":"Always remember that in hydroelectric questions, 'Penstock' relates to fluid pressure regulation via surge tanks, while 'Governor' relates to mechanical speed control."}
