Electronics and Communication Engineering  Signals and Systems
Exercise :: Signals and Systems  Section 8
1. 
The discrete time system describes by y(n) = x(n^{2}) is 
A. 
casual, Linear, time varying  B. 
casual, nonlinear, timevari  C. 
noncasual, Linear, time invariant  D. 
noncasual, nonlinear, time variant 
Answer: Option A
Explanation:

2. 
If Laplace transform of f(t) is F(s), then £[tf(t)] = 
Answer: Option B
Explanation:

3. 
A system is stable if ROC 
A. 
include the unit circle  B. 
exclude the unit circle  C. 
lies on Circle  D. 
entire plane 
Answer: Option A
Explanation:

4. 
The Laplace transform of a unit step function is 
Answer: Option B
Explanation:

5. 
The minimum sampling frequency in sample/sec. required to reconstruct the following signal from its samples wuthout distortion would be 
A. 
2 x 10^{3}  B. 
4 x 10^{3}  C. 
6 x 10^{3}  D. 
8 x 10^{3} 
Answer: Option C
Explanation:
