railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Signals and Systems Introduction To Signals and Systems Types of Systems
Which of the following systems are time-invariant?
1
y(t) = t2 x(t - 1)
2
y(t) = x(t) + tx(t - 1)
3
y(t) = t x(t)
4
y(t) = x(t)