# Discrete Time Systems MCQ’s

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

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

2. 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

3. If a system does 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

4. 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
c) No operation
d) None of the mentioned

5. What is the output y(n) when a signal x(n)=n*u(n)is passed through an 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

6. The block denoted as follows is known as __________
a) Delay block
c) Multiplier block

7. 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

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

9. 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

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

11. 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
c) Subtractor
d) Multiplier

12. If the output of the system at any ‘n’ depends only on 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

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