railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Signals and Systems Linear Time Invariant Systems Properties of LTI Systems
An LTI system is causal if and only if
1
h(t) = 0 for t < 0
2
h(t) is finite for 0 < t < ∞
3
h(t) is finite for t < 0
4
h(t) is non-zero for all t