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← ScienceWhich consequence results when high back pressure forms?
A)Internal compression becomes substantially more complete
B)Volumetric efficiency declines significantly✓
C)Clearance volume requirement may often decrease
D)Refrigerant mass flow rate holds precisely constant
💡 Explanation
Lower volumetric efficiency results because high back pressure raises residual gas fraction preventing complete cylinder filling via valve overlap creating backflow. Therefore, volumetric efficiency plunges, rather than more compression, with an opposite effect on refrigerant values.
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