The GATE Grind

GATE Networks, Signals and Systems: LTI Systems – Previous Year Questions

17 GATE previous year questions on LTI Systems (Networks, Signals and Systems, Electronics and Communication Engineering) with answers and explanations, from every paper.

  1. GATE 2017 EC Q15 (1 mark, Multiple choice) – Consider the following statements for continuous-time linear time invariant (LTI) systems. I. There is no bounded input bounded output (BIBO) stable…
  2. GATE 2017 EC Q16 (1 mark, Multiple choice) – Consider a single input single output discrete-time system with x[n] as input and y[n] as output, where the two are related as y[n] = cases n x[n] , &…
  3. GATE 2017 EC Q62 (2 marks, Numerical answer) – A continuous time signal x(t) = 4(200 t) + 8(400 t), where t is in seconds, is the input to a linear time invariant (LTI) filter with the impulse…
  4. GATE 2016 EC Q16 (1 mark, Multiple choice) – Which one of the following is an eigen function of the class of all continuous-time, linear, time-invariant systems (u(t) denotes the unit-step…
  5. GATE 2018 EC Q14 (1 mark, Multiple choice) – Let the input be u and the output be y of a system, and the other parameters are real constants. Identify which among the following systems is not a…
  6. GATE 2019 EC Q15 (1 mark, Multiple choice) – Let Y(s) be the unit-step response of a causal system having a transfer function G(s)=3-s(s+1)(s+3) that is, Y(s)=G(s)s. The forced response of the…
  7. GATE 2020 EC Q15 (1 mark, Multiple choice) – The output y[n] of a discrete-time system for an input x[n] is y[n]= - k n x[k] . The unit impulse response of the system is
  8. GATE 2021 EC Q50 (2 marks, Numerical answer) – For a unit step input u[n], a discrete-time LTI system produces an output signal (2[n+1]+[n]+[n-1]). Let y[n] be the output of the system for an input…
  9. GATE 2022 EC Q46 (2 marks, Multiple select) – The outputs of four systems (S 1, S 2, S 3, and S 4) corresponding to the input signal (t), for all time t, are as follows. S 1: input (t), output…
  10. GATE 2023 EC Q26 (1 mark, Multiple choice) – Consider a system with input x(t) and output y(t)=x(et). The system is
  11. GATE 2023 EC Q58 (2 marks, Numerical answer) – Let x 1(t)=u(t+1.5)-u(t-1.5) and x 2(t) is shown in the figure below. For y(t)=x 1(t)*x 2(t), the -y(t)\,dt is (rounded off to the nearest integer).
  12. GATE 2024 EC Q21 (1 mark, Multiple choice) – A causal and stable LTI system with impulse response h(t) produces an output y(t) for an input signal x(t). A signal x(0.5t) is applied to another…
  13. GATE 2024 EC Q24 (1 mark, Multiple select) – For a causal discrete-time LTI system with transfer function H(z)=2z2+3(z+13)(z-13), which of the following statements is/are true?
  14. GATE 2025 EC Q17 (1 mark, Multiple choice) – Consider the discrete-time system below with input x[n] and output y[n]. In the figure, h 1[n] and h 2[n] denote the impulse responses of LTI…
  15. GATE 2026 EC Q13 (1 mark, Multiple choice) – The Laplace Transform of the signal x(t) = u(t-2) * (t\,u(t)) is given by which of the following expressions? [“*” represents convolution operator]
  16. GATE 2026 EC Q16 (1 mark, Multiple choice) – The response of a discrete time system y[n] obeys the following relation: y[n]=56 y[n-1]-16 y[n-2]+x[n]. The input to the system is x[n]=[n]-13[n-1].…
  17. GATE 2026 EC Q47 (2 marks, Multiple choice) – Consider the discrete time system (S) with input x[n] and output y[n] as shown in the Figure. The two sub-systems represented by their impulse…