1415 S1 Exam.pdf - SINGAPORE POLYTECHNIC ET0048/ET0163...

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SINGAPORE POLYTECHNIC ET0048/ET0163 2014/2015_S1 Page 1 of 9 2014/2015 SEMESTER ONE EXAMINATION Diploma in Electrical and Electronic Engineering 3 rd Year FT Diploma in Electrical and Electronic Engineering 4 th Year EO Diploma in Mechatronics and Robotics 3 rd Year FT SYSTEMS AND CONTROL Time Allowed: 2 Hours Instructions to candidates: 1. The examination rules set out on the last page of the answer booklet are to be complied with. 2. This paper consists of TWO sections: Section A - 6 short questions, 10 marks each. Section B - 2 long questions, 20 marks each. 3. ALL questions are COMPULSORY . 4. All questions are to be answered in the answer booklet. 5. The examination paper consists of a total of 7 pages. 6. A Laplace transform table, Z-transform table and formula for dynamic system performance are given at the last two pages.
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SINGAPORE POLYTECHNIC ET0048/ET0163 2014/2015_S1 Page 2 of 9 SECTION A Answer all questions. Each question carries 10 marks. A1. A level control system is shown in Fig. A1. (a) Sketch the system block diagram. (8 marks) (b) Identify the set-value and the controlled variable. (2 marks) Fig. A1 A2. A negative feedback control system is shown in Fig. A2. (a) Determine the closed-loop transfer function. (6 marks) (b) Obtain 𝐶(𝑠) 𝑅(𝑠) if 1 H(s) and , 1 ) ( G , 2 ) ( , ) ( 3 2 1 s s s G k s G . (4 marks) R(s) C(s) G 1 (s) G 2 (s) G 3 (s) H(s) _ + + Fig. A2 + Controller Control Valve Capacitance probe Tank Water supply Water outflow Level reference H
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SINGAPORE POLYTECHNIC ET0048/ET0163 2014/2015_S1 Page 3 of 9 A3. A first-order system is shown in Fig. A3.
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