engineering recuitment BEL Probationary Engineers Mock Test 2025 Signals and Systems Linear Time Invariant Systems Continuous Time LTI Systems
The response h(t) of a linear time invariant system to an impulse δ(t), under initially relaxed condition is h(t) = e-t + e-2t. The response of this system for a unit step input u(t) is
1
u(t) + e-t + e-2t
2
(e-t + e-2t) u(t)
3
(1.5 – e-t – 0.5 e-2t) u(t)
4
e-tδ(t) + e-2t u(t)