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Unformatted text preview: EE 429 EXAM II 24 April 1995 Name: ID#: DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO Problem Weight Score 1 20 2 20 3 30 4 30 Total 100 This test consists of four problems. Answer each problem on the exam itself; if you use additional paper, repeat the identifying information above, and staple it to the rest of your exam when you hand it in. The quality of your analysis and evaluation is as important as your answers. Your reasoning must be precise and clear; your complete English sentences should convey what you are doing. For your convenience, a z-Transform table is provided on page 10 and a calibrated scale is given on page 11. 1 Problem 1: (20 points) A student is experimenting with a simple sampled-data control system in the laboratory for the first time. The block diagram of the system is shown in Fig. 1. K 1- e- sT s T = 1 sec- R ( s ) + ZOH Plant 1 s Y ( s ) Figure 1: Simple sampled-data system used by our novice control engineer. 1. (10 points) To determine the effect of the amplifier gain K on system stability, the student increases the gain K from zero to three. describe the natural response the student will observe for the followingfrom zero to three....
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