Which symptom indicates cavitation onset in hydraulic turbines?

💡 Explanation

Reduced turbine efficiency indicates cavitation because vapor bubble formation and collapse remove power through turbulent energy dissipation rather than transferring it to mechanical rotation; therefore, efficiency drops, rather than viscosity changing or oxygenation increasing.

• Which issue arises if an aircraft's flight controls experience excessive free play?
• Which limit occurs when an LED's junction temperature increases excessively?
• Which limitation on bandwidth results when a photodiode detects an incident pulsed optical signal?
• Which consequence results when an aircraft's aileron control cable jams near the wingtip, preventing aileron deflection?
• Which risk increases when a turbocharged engine operates at high altitude with fixed wastegate settings?
• Which risk increases when an aircraft's fuel rapidly vaporizes?