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# Discrete Time System Implementation MCQ’s

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

1. The system described by the equation y(n)=ay(n-1)+b x(n) is a recursive system.
a) True
b) False

2. Which of the following linear time invariant system is a purely recursive system?
a) y(n) = −∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)+∑𝑀𝑘=0𝑏𝑘𝑥(𝑛−𝑘)
b) y(n) = ∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)+∑𝑀𝑘=0𝑏𝑘𝑥(𝑛−𝑘)
c) y(n) = −∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)−∑𝑀𝑘=0𝑏𝑘𝑥(𝑛−𝑘)
d) y(n) = −∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)+𝑏0𝑥(𝑛)

3. To implement the linear time-invariant recursive system described by the difference equation y(n)=−∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)+∑𝑀𝑘=0𝑏𝑘𝑥(𝑛−𝑘) in Direct form-I, how many a number of delay elements and multipliers are required respectively?
a) M+N+1, M+N
b) M+N-1, M+N
c) M+N, M+N+1
d) None of the mentioned

4. An FIR system is also called as “recursive system”.
a) True
b) False

5. What is the output of the system represented by the following direct form?

a) y(n)=-a1y(n-1)-a2y(n-2)- b0x(n)-b1x(n-1)-b2x(n-2)
b) y(n)=-a1y(n-1)-a2y(n-2)+b0x(n)
c) y(n)=-a1y(n-1)-a2y(n-2)+ b0x(n)+b1x(n-1)+b2x(n-2)
d) y(n)=a1y(n-1)+a2y(n-2)+ b0x(n)+b1x(n-1)+b2x(n-2)

6. What is system does the following direct form structure represents?

a) FIR system
b) Purely recursive system
c) General second order system
d) None of the mentioned

7. The system represented by the following direct form structure is:

a) General second order system
b) Purely recursive system
c) Partial recursive system
d) FIR system

8. Which of the following is the difference equation of a special case of FIR system?
a) y(n) = ∑𝑀𝑘=0𝑏𝑘𝑥(𝑛−𝑘)
b) y(n) = 𝑎0𝑦(𝑛)−∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)
c) y(n) = −∑𝑁𝑘=1𝑎𝑘𝑦(𝑛−𝑘)
d) None of the mentioned

9. What is the form of the FIR system to compute the moving average of the signal x(n)?
a) y(n)=1𝑀+1∑𝑀𝑘=0𝑥(𝑛−𝑘)
b) y(n)=1𝑀+1∑𝑀𝑘=0𝑥(𝑛+𝑘)
c) y(n)=1𝑀+1∑∞𝑘=0𝑥(𝑛−𝑘)
d) None of the mentioned

10. Which of the following is a recursive form of a non-recursive system described by the equation y(n)=1𝑀+1∑𝑀𝑘=0𝑥(𝑛−𝑘)?
a) y(n)=y(n-1)+1𝑀+1[x(n)+x(n-1-M)]
b) y(n)=y(n-1)+1𝑀+1[x(n)+x(n-1+M)]
c) y(n)=y(n-1)+1𝑀+1[x(n)-x(n-1+M)]
d) y(n)=y(n-1)+1𝑀+1[x(n)-x(n-1-M)]

11. The system described by the equation y(n)=ay(n+1)+b x(n) is a recursive system.
a) True
b) False

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