Signal and System Processing

Digital Communications Systems

This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “signals, Systems and Signal Processing”.

1. Which of the following is common independent variable for speech signal, EEG and ECG?
a) Time
b) Spatial coordinates
c) Pressure
d) None of the mentioned

2. Which of the following conditions made digital signal processing more advantageous over analog signal processing?
a) Flexibility
b) Accuracy
c) Storage
d) All of the mentioned

3. Which property does y(t)=x(1-t) exhibit?
a) Time scaling
b) Time shifting
c) Reflecting
d) Time shifting and reflecting

4. If x(n)=(0,1,2,3,3,0,0,0) then x(2n) is?
a) (0,2,4,6,6,0,0,0)
b) (0,1,2,3,3,0,0,0)
c) (0,2,3,0,0,0,0,0)
d) None of the mentioned

5. If x(n)=(0,0,1,2,3,4,0,0) then x(n-2) is?
a) (0,0,2,4,6,8,0,0)
b) (0,0,1,2,3,4,0,0)
c) (1,2,3,4,0,0,0,0)
d) (0,0,0,0,1,2,3,4)

6. If x(n)=(0,0,1,1,1,1,1,0) then x(3n+1) is?
a) (0,1,0,0,0,0,0,0)
b) (0,0,1,1,1,1,0,0)
c) (1,1,0,0,0,0,0,0)
d) None of the mentioned

7. If a signal x(t) is processed through a system to obtain the signal (x(t)2), then the system is said to be ____________
a) Linear
b) Non-linear
c) Exponential
d) None of the mentioned

8. What are the important block(s) required to process an input analog signal to get an output analog signal?
a) A/D converter
b) Digital signal processor
c) D/A converter
d) All of the mentioned

9. Which of the following block is not required in digital processing of a RADAR signal?
a) A/D converter
b) D/A converter
c) DSP
d) All of the mentioned

10. Which of the following wave is known as “amplitude modulated wave” of x(t)?
a) C.x(t) (where C is a constant)
b) x(t)+y(t)
c) x(t).y(t)
d) dx(t)/dt

11. What is the physical device that performs an operation on the signal?
a) Signal source
b) System
c) Medium
d) None of the mentioned

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