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Which outcome results if a heat pump's operating cycle exceeds atmospheric pressure limits?

A)Refrigerant boiling temperature shifts upwards
B)Cycle efficiency proportionally improves drastically
C)Lubricant oil becomes more viscous
D)System undergoes compressive mechanical lockup

💡 Explanation

Compressive mechanical lockup occurs because exceeding atmospheric pressure limits causes an increase in compression ratio, straining pistons or rotors until they seize up therefore resulting in failure rather than increased efficiency or temperature changes.

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