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Which outcome occurs when a PID controller aggressively corrects small setpoint deviations in process control?

A)Systematic bias from sensor drift
B)Damped oscillations around setpoint
C)Runaway instability with amplified oscillations
D)Permanent offset from controller saturation

💡 Explanation

When a PID controller overreacts to small deviations, derivative gain amplifies noise causing rapid control action resulting in exponentially increasing oscillations, leading to instability. Therefore runaway instability emerges, rather than bias, damping or offset which require component malfunctions or specific integral saturation.

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