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← TechnologyRefrigerant pump efficiency decreases from oil contamination due to what effect on the pump?
A)Increased fluid viscosity restricting flow✓
B)Reduced motor torque from lubrication failure
C)Accelerated impeller wear from cavitation
D)Localized overheating due to poor heat transfer
💡 Explanation
When oil contaminates refrigerant, fluid viscosity increases because the immiscible oils raise the intermolecular friction, restricting the refrigerant's flow rate. Therefore increased fluid viscosity restricts flow, rather than lubrication failure, cavitation, or localized overheating, which involve distinct physical mechanisms.
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