Discussion
If the gain of a feedback system is too high, the system may become
Answer: B
With too much gain the system may become oscillatory or unstable.
Every real feedback loop has delays and phase lag. As loop gain rises, the phase and gain margins shrink, and when the gain reaches 1 at a phase lag of 180 degrees, the negative feedback in effect turns positive. The response then rings, oscillates without settling, or grows without limit.
Higher gain makes the system faster and more responsive, not unresponsive, and up to a point it reduces error, but it does not make the system more stable. Dead time is a fixed property of the process, not something the gain creates.
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