# Properties of Systems – 4 MCQ’s

This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Properties of Systems – 4″.

1. If This is an example for _______ system.
a) Stable system
b) Unstable system
c) Bounded input unbounded output system
d) Unbounded input system

2. If x(t)= ∂(t-1) and y(t)= e-t. This is an example for ______ system.
a) Stable
b) BIBO
c) Bounded input
d) Unstable

3. What is a stable system?
a) If every bounded input results in the bounded output
b) If every bounded input results in an unbounded output
c) If every unbounded input results in a bounded output
d) If unbounded input results in bounded as well as unbounded output

4. Which of the following is not true about systems having memory?
a) It is also called dynamic systems
b) The output signal depends on the past values of the input signal
c) It is also called static system
d) Resistive circuit

5. If x(t)=et, y(t)= e-2t this is a _____system.
a) Unstable
b) Stable
c) BIBO
d) Cannot classify the system

6. How far does the memory of the given system y[n]=1/2{x[n]+ x[n-1]} extend into past?
a) Two time units
b) One time unit
c) Three time units
d) Not predictable

7. What is the memory of the system if its input-output relation is given by  ?
a) Memory extends from time t to the infinite future
b) Memory extends from time t to the infinite past
c) Does not have memory
d) Insufficient information

8. The input- output relation of a device is represented asi(t)=ao+a1v1(t)+a2v2 (t)+⋯. Does this device have memory?
a) Has memory
b) Does not have memory
c) It is dynamic
d) Insufficient information

9. Which is not an example for memory system?
a) Capacitive circuit
b) Inductive circuit
c) Resistive circuit
d) Parallel RC circuit

10. Which of the following systems is memory less?
a) y(t) = 2x(t) + ddx x(t)
b) y(t) = 2x2 (t) + ddx x(t)
c) y(t) = ∫x(t)dt
d) y(t) = 2x2 (t)

11. Is Ideal low pass filter is an example for Non –causal system?
a) True
b) False

12. Which of the following is an example for non- causal system?
a) y[n] = 13 {x[n-1] + x[n] + x[n-2]}
b) y[n] = 13 {x[n-1] + x[n] + x[n+1]}
c) y[n] = 12 {x[n-1] + x[n]}
d) y[n] = 12 {x[n] + x[n-2]}

13. An example for non-causal system is ________
a) Amplifier
b) Oscillator
c) Rectifiers
d) Does not exists

14. Can impulse response be measured?
a) Impulse cannot be generated
b) Impulse can be generated
c) Can be measured
d) Cannot be measured

15. Which of the following is not true about invertible systems?
a) H-1 H=I
b) There must be one-to-one mapping between input and output signals for a system to be invertible
c) Input of the invertible system can be recovered from the system output
d) Input of the invertible system cannot be recovered from the system output

16. y(t) = 2x(t) + 3t ddx x(t) Is an example for _____
a) Time invariant system
b) Time varying system
c) LTI system
d) Time invariant and linear system

17. Is y(t)= x2 (t) is an example for invertible system?
a) True
b) False

18. y(t) = 5x(t) + 6 ddx x(t) Is an example for _____ system.
a) Time varying
b) Time invariant
c) Time varying and linear
d) Time varying and non linear 5 Star
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