1. A digital control system uses digital signals and a digital computer to control a process. False True or 2. The sampled signal is available only with limited precision. True or False 3. Root locus methods are not applicable to digital control system design and analysis. True or False 4. A sampled system is stable if all the poles of the closed-loop transfer function lie outside the unit circle of the z-plane. True or False 5. The z-transform is a conformal mapping from the s-plane to the z-plane by the relation -e" True or False