Cavitation in a hydraulic machine begins when the local absolute pressure falls below the liquid's:
Correct answer: A. Vapour pressure
- A. Vapour pressure
- B. Atmospheric pressure
- C. Stagnation pressure
- D. Critical pressure
Explanation
Cavitation occurs when local absolute pressure becomes less than the liquid vapour pressure, causing vapour bubbles to form. Atmospheric pressure is not the controlling limit inside a pressurized flow passage.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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