GATE Control Systems: Transfer Function, Block Diagram and Signal Flow Graph – Previous Year Questions

5 GATE previous year questions on Transfer Function, Block Diagram and Signal Flow Graph (Control Systems, Electronics and Communication Engineering) with answers and explanations, from every paper.

1. GATE 2019 EC Q42 (2 marks, Multiple choice) – The block diagram of a system is illustrated in the figure shown, where X(s) is the input and Y(s) is the output. The transfer function H(s)=Y(s)X(s)…
2. GATE 2021 EC Q23 (1 mark, Multiple choice) – The block diagram of a feedback control system is shown in the figure. The transfer function Y(s)X(s) of the system is
3. GATE 2023 EC Q42 (2 marks, Multiple choice) – In the following block diagram, R(s) and D(s) are two inputs. The output Y(s) is expressed as Y(s)=G 1(s)R(s)+G 2(s)D(s). G 1(s) and G 2(s) are given…
4. GATE 2025 EC Q56 (2 marks, Multiple select) – Consider a system represented by the block diagram shown below. Which of the following signal flow graphs represent(s) this system? Choose the correct…
5. GATE 2026 EC Q19 (1 mark, Multiple choice) – A control system is shown in the Figure. Which option represents the correct transfer function of the system?