EEC 217 Signals and Systems Exam 2026

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EEC 217: First Semester Examination for EEC217, Signals and Systems, University of Buea, instructor Dr. FEUDJIO, 15:30-17:30. Section I (20 marks): defining a system, periodic signal and random signal; mathematical expressions for energy, power and convolution; sketching/defining the unit impulse and unit step for continuous- and discrete-time; even/odd decomposition of x[n]=u[n]. Section II (50 marks): energy and power of a triangular ramp and of u[n]; expressing a piecewise exponential signal in closed form and describing its time-expansion by a factor of 2; testing time-invariance of y(t)=t x(t) and y[n]=n x[n]; deriving the ODE and zero-state step/exponential response for a transfer function H(s)=(s+5)/(s^2+5s+6); and the z-transform, pole-zero plot and region of convergence of the two-sided exponential x[n]=a^|n| for a<1 and a>1.