# Properties of the Impulse Response Representation for LTI Systems MCQ’s

This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Properties of the Impulse Response Representation for LTI Systems”.

2. When two LTI systems with impulse responses ha (t) and hb (t) are cascaded then equivalent response is given by ______

a) h(t) = ha(t) + hb(t)

b) h(t) = ha(t) – hb(t)

c) h(t) = ha(t) hb(t)

d) h(t) = ha(t) * hb(t)

3. What is this property of impulse response is called ___________

h1(t) * h2(t) = h2(t) * h1(t)

a) Associative property

b) Commutative property

c) Distributive property

d) Closure law

1. If two LTI systems with impulse response h1 (t) and h2 (t) and are connected in parallel then output is given by ______

a) y(t) = x(t) *(h1(t) + h2(t))

b) y(t) = x(t) + (h1(t) + h2(t))

c) y(t) = x(t) * (h1(t) h2(t))

d) y(t) = (x(t) * h1(t)) + h2(t)

4. The overall impulse response of the system is given by ______

a) h(t) = (h1(t) + h2(t) * h3(t)) – h4(t)

b) y(t) = x(t) * (h1(t) + h2(t)*h3(t)) – h4(t)

c) h(t) = (h1(t) + h2(t) * h3(t)) + h4(t) * x(t)

d) h(t) = (h1(t) h2(t) * h3(t)) – h4(t)

6. The condition for memory-less system is given by _____

a) h[k] = cδ[k]

b) h[k] = cδ[n-k]

c) h[k] = ch[k]δ[k]

d) h[k] = ch[n-k]δ[k]

5. The overall impulse response of the system is given by ______

a) h[n] = (h1[n]-h2[n])*h3[n]+h5[n]*h4[n]

b) h[n] = (((h1[n]-h2[n])*h3[n])+h5[n])*h4[n]

c) h[n] = (((h1[n]-h2[n])*h3[n])-h5[n])*h4[n]

d) h[n] = (((h1[n]-h2[n])*-h3[n])-h5[n])*h4[n]

8. Causal systems are ______

a) Anticipative

b) Non anticipative

c) For certain cases anticipative

d) For certain cases anticipative and non anticipative

7. The causal continuous system with impulse response should satisfy ____ equation.

a) h(t)=0,t<0

b) h(t)=0,t>0

c) h(t)≠0,t<0

d) h(t)≠0,t≤0

9. Which of the following is true for discrete-time stable systems?

a)

b)

c)

d)

10. The impulse response of discrete-time signal is given by h [n] = u [n+3]. Whether the system is causal or not?

a) Causal

b) Non-causal

c) Insufficient information

d) The system cannot be classified

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