Discrete Time Systems

Digital Communications Systems

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

1. The output signal when a signal x(n)=(0,1,2,3) is processed through an ‘Identical’ system is?
a) (3,2,1,0)
b) (1,2,3,0)
c) (0,1,2,3)
d) None of the mentioned

2. If a signal x(n) is passed through a system to get an output signal of y(n)=x(n+1), then the signal is said to be ____________
a) Delayed
b) Advanced
c) No operation
d) None of the mentioned

3. If the output of the system is y(n)=∑nk=−∞x(y) with an input of x(n) then the system will work as ___________
a) Accumulator
b) Adder
c) Subtractor
d) Multiplier

4. What is the output y(n) when a signal x(n)=n*u(n)is passed through a accumulator system under the conditions that it is initially relaxed?
a) n2+n+12
b) n(n+1)2
c) n2+n+22
d) None of the mentioned

5. The block denoted as follows is known as __________

a) Delay block
b) Advance block
c) Multiplier block
d) Adder block

6. The output signal when a signal x(n)=(0,1,2,3) is processed through an ‘Delay’ system is?
a) (3,2,1,0)
b) (1,2,3,0)
c) (0,1,2,3)
d) None of the mentioned

7. The system described by the input-output equation y(n)=nx(n)+bx3(n) is a __________
a) Static system
b) Dynamic system
c) Identical system
d) None of the mentioned

8. Whether the system described by the input-output equations y(n)=x(n)-x(n-1) a Time-variant system.
a) True
b) False

9. The system described by the input-output equations y(n)=x2(n) is a Non-linear system.
a) True
b) False

10. If the output of the system of the system at any ‘n’ depends only the present or the past values of the inputs then the system is said to be __________
a) Linear
b) Non-Linear
c) Causal
d) Non-causal

11. The system described by the input-output equations y(n)=x(-n) is a causal system.
a) True
b) False

12. If a system do not have a bounded output for bounded input, then the system is said to be __________
a) Causal
b) Non-causal
c) Stable
d) Non-stable

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