A closed-loop control system is usually more accurate than an open-loop system. 2. Feedback is sometimes used to improve the sensitivity of a control system. 1. (T) (F) (T) (F) If an open-loop system is unstable, then applying feedback will always improve its stability. 3. (T) (F) 4. Feedback can cause instability. (T) (F) 5. Nonlinear elements are sometimes intentionally introduced to a control system to improve its performance. (T) (F) 6. Discrete-data control systems are more susceptible to noise due to the nature of its signals. (T) (F)

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.