The GATE Grind

GATE Engineering Mathematics: Complex Variables: Cauchy's integral theorem – Previous Year Questions

7 GATE previous year questions on Complex Variables: Cauchy's integral theorem (Engineering Mathematics, Electrical Engineering) with answers and explanations, from every paper.

  1. GATE 2017 EE Q38 (2 marks, Multiple choice) – Consider the line integral I = c (x2 + iy2)\,dz, where z = x + iy. The line c is shown in the figure below. [Figure: The x-y plane with a straight…
  2. GATE 2018 EE Q23 (1 mark, Multiple choice) – The value of the integral Cz+1z2-4\,dz in counter clockwise direction around a circle C of radius 1 with center at the point z=-2 is
  3. GATE 2018 EE Q45 (2 marks, Multiple choice) – If C is a circle z =4 and f(z)=z2(z2-3z+2)2, then Cf(z)\,dz is
  4. GATE 2019 EE Q37 (2 marks, Multiple choice) – The closed loop line integral z =5z3+z2+8z+2\,dz evaluated counter-clockwise, is
  5. GATE 2020 EE Q15 (1 mark, Multiple choice) – The value of the following complex integral, with C representing the unit circle centered at origin in the counterclockwise sense, is: Cz2+1z2-2z\,dz
  6. GATE 2021 EE Q38 (2 marks, Multiple choice) – Let (-1-j), (3-j), (3+j) and (-1+j) be the vertices of a rectangle C in the complex plane. Assuming that C is traversed in counter-clockwise…
  7. GATE 2026 EE Q62 (2 marks, Numerical answer) – The magnitude of the contour integral C((z+1)2(z-i)(z-2))dz over the contour C:\ z-2-i =3/2 is . (Round off to two decimal places) Note: z is a…