Vidya Vikas Pratishtan
Institute of Engineering & Technology, Solapur
Department of Electronics and telecommunication engineering
(Academic Year 2016-17)
Unit Test III Subject: - SS Date: 11/04/2017
Class: - SE Time: -10-11 am Max. Marks- 30
Q.1. Multiple choice questions (1*5=5)
1. If x[4-n] is derived from the x[n] by which transformation?
a) Reversal and shift b) reversal only c) Scaling d) scaling and shifting
2. Which system is non-causal system?
a) y(t)=x(t+1) b) y(t)=x(t-1) c) y(t)=x(t)+c d) y(t)=x(t)-c
3. With u(n) as unit step function, u(n)-u(n-1) is
a) δ(n) b) δ(n)+ δ(n-1) c) δ(n)- δ(n-1) d) δ(n)+ δ(n+1)
4. Find the convolution of x(n)={1,2,2} h(n)={1,2}
a) {1,2,5,6} b) {0,4,3,1} c) {1,4,6,4} d) {4,2,3,1}
5. A discrete time signal is represented as
a) x(n) b) x(t) c) u(n) d) δ(n)
6. Find the time period of x(t)= cos(50t)
a) 25π b) 50 c) π/2 d) π/25
Q.2. Attempt any three (5*3=15)
a) Determine following system is y(t)= even {x(t)}
1. static/dynamic 2. Linear / Non-linear 3. Causal/non-causal
b) Check for causal/non-causal and Linear/ Non-linear Y(t)=ex(t)
c) For the signal shown in fig. find following 1. x(2t+1) 2. x(3-2t)
d) Find the convolution using graphical method x(n)={1,2,3,2} h(n)={1,2,2}
e) Find the step response and also check the stability if the impulse response is e-2t u(t)
