In a cryogenic pump circulating liquid helium, which failure results when internal seals degrade?

💡 Explanation

Decreased volumetric efficiency results from seal degradation because leak-back occurs, where pumped fluid recirculates within the pump via internal leakage, therefore less fluid reaches the outlet, rather than optimized impeller flow or reduced losses.

• Which outcome occurs when an internal combustion engine piston approaches top dead center with excessive carbon accumulation?
• Which consequence results when a hydraulic pump operates hot, under heavy load?
• Which hazard arises when a three-phase circuit breaker fails to interrupt a short circuit?
• Which risk increases when water condenses extensively within an aircraft's fuel tanks?
• Which positional error occurs during sensor fusion in autonomous robot navigation, if Kalman filtering is inadequately tuned regarding inertial measurement?
• Which outcome occurs when a satellite's reaction wheels saturate near rotational limits?