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Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

Questions
1 The impulse response of a LTI system is h(n)={1,1,1}. What is the response of the signal to the input x(n)={1,2,3}?
A {1,3,6,3,1}
B {1,2,3,2,1}
C {1,3,6,5,3}
D {1,1,1,0,0}

Answer:{1,3,6,5,3}
2  x(n)*(h1(n)*h2(n))=(x(n)*h1(n))*h2(n).
A True
B False

Answer:True
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3 An LTI system is said to be causal if and only if?
A Impulse response is non-zero for positive values of n
B Impulse response is zero for positive values of n
C Impulse response is non-zero for negative values of n
D Impulse response is zero for negative values of n

Answer:Impulse response is zero for negative values of n
4 x(n)*δ(n-n0)=?
A x(n+n0)
B x(n-n0)
C x(-n-n0)
D x(-n+n0)

Answer:x(n-n0)
5 Is the system with impulse response h(n)=2nu(n-1) stable.
A True
B False

Answer:False
6 If x(n) is a discrete-time signal, then the value of x(n) at non integer value of ‘n’ is?
A Zero
B Positive
C Negative
D Not defined

Answer:Not defined
7 The discrete time function defined as u(n)=n for n≥0;u(n)=0 for n<0 is an _____________
A Unit sample signal
B Unit step signal
C Unit ramp signal
D None of the mentioned

Answer:Unit ramp signal
8 The phase function of a discrete time signal x(n)=an, where a=r.ejθ is?
A tan(nθ)
B nθ
C tan-1(nθ)
D none of the mentioned

Answer:nθ
9 x(n)*δ(n-k)=?
A x(n)
B x(k)
C x(k)*δ(n-k)
D x(k)*δ(k)

Answer:x(k)*δ(n-k)
10 A real valued signal x(n) is called as anti-symmetric if ___________
A x(n)=x(-n)
B x(n)=-x(-n)
C x(n)=-x(n)
D none of the mentioned

Answer:x(n)=-x(-n)

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