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← ScienceWhich consequence results when a PID loop's transfer function exhibits excessive phase lag on extruder temperature?
A)Rapid actuator thermal runaway
B)Unstable oscillatory temperature control✓
C)Reduced steady-state viscosity target
D)Increased material strength via annealing
💡 Explanation
Unstable oscillatory temperature control results because *negative feedback* becomes positive due to the phase shift, causing continuous overcorrection. Therefore, temperature oscillates rather than settling, because the correction adds to the error.
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