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GATE Engineering Mathematics: PDE: Fourier series, separation of variables, diffusion, wave and Laplace equations – Previous Year Questions

8 GATE previous year questions on PDE: Fourier series, separation of variables, diffusion, wave and Laplace equations (Engineering Mathematics, Civil Engineering) with answers and explanations, from every paper.

  1. GATE 2023 CE (CE1) Q25 (1 mark, Multiple select) – The following function is defined over the interval [-L, L]: f(x) = px4 + qx5. If it is expressed as a Fourier series, f(x) = a 0 + n=1\a n(n xL) + b…
  2. GATE 2024 CE (CE2) Q11 (1 mark, Multiple choice) – A partial differential equation 2T x2 + 2T y2 = 0 is defined for the two-dimensional field T: T(x, y), inside a planar square domain of size 2 m × 2…
  3. GATE 2024 CE (CE1) Q12 (1 mark, Multiple choice) – The second-order differential equation in an unknown function u: u(x, y) is defined as 2u x2 = 2. Assuming g: g(x), f: f(y), and h: h(y), the general…
  4. GATE 2024 CE (CE1) Q28 (1 mark, Multiple select) – For the following partial differential equation, x2f x2 + y2f y2 = x2 + y22, which of the following option(s) is/are CORRECT?
  5. GATE 2025 CE (CE1) Q13 (1 mark, Multiple choice) – Which one of the following options is the correct Fourier series of the periodic function f(x) described below: f(x) = cases 0, & -2 < x < -1 \\ 2k, &…
  6. GATE 2025 CE (CE1) Q28 (1 mark, Multiple select) – Which of the following equations belong/belongs to the class of second-order, linear, homogeneous partial differential equations:
  7. GATE 2026 CE (CE2) Q13 (1 mark, Multiple choice) – Periodic function f(x) is given below. f(x) = cases -1, & - < x < 0 \\ 1, & 0 < x < cases; f(x + 2) = f(x) The CORRECT option representing the Fourier…
  8. GATE 2026 CE (CE2) Q30 (1 mark, Multiple select) – A partial differential equation is given below. 2 u x2 - 2 u y2 = 0 Possible solution(s) is/are: