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← ScienceWhich outcome occurs when a positive displacement pump attempts to transfer a fluid held above its critical temperature?
A)Mass flow rate becomes negligible✓
B)Pump undergoes resonant cavitation
C)Volumetric efficiency reaches theoretical maximum
D)Drive motor experiences lowered back-EMF
💡 Explanation
When a fluid is held above its critical temperature, distinct liquid and gas phases no longer exist, because the heat transformation prevents phase change, resulting in greatly reduced volumetric expansion work. Therefore mass flow rate diminishes significantly, rather than cavitation, efficiency increase or back-EMF changes, which require phase separation and boiling.
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