Electronics and Communication Engineering  Signals and Systems
Exercise :: Signals and Systems  Section 5
1. 
The unit step response of a system starting from rest is given by c(t) = 1  e^{2t} for t ≥ 0. The transfer function of the syste is 
Answer: Option B
Explanation:

2. 
check the following system for causality  y[n] = x[n] + 2x[n  1]
 y[n] = x[n  k]
 y[n] = x[2n]

A. 
(1) and (2)  B. 
(2) and (3)  C. 
(1) omly  D. 
(1) and (3) 
Answer: Option C
Explanation:

3. 
If the system transfer function of a discrete time system then system is 
A. 
stable  B. 
unstable  C. 
stable at z = 1  D. 
unstable at z = 1 
Answer: Option A
Explanation:

4. 
Two rectangular waveforms of duration t_{1} and t_{2} seconds are convolved. What is the shape of the resulting waveform? 
A. 
Triangular  B. 
Rectangular  C. 
Trapezoidal  D. 
Semicircular 
Answer: Option C
Explanation:

5. 
The function Ae^{(s + jω)}^{t} represens a rotating phasor having a magnitude increasing with time. 
Answer: Option A
Explanation:
