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Free download in PDF Digital Signal Processing Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
The magnitude function |H(ω)| can be zero at some frequencies, but it cannot be zero over any finite band of frequencies.
(2)
If h(n) is causal and h(n)=he(n)+ho(n),then what is the expression for h(n) in terms of only he
[A]
h(n)=2he(n)u(n)+he(0)δ(n), n ≥ 0
[B]
h(n)=2he(n)u(n)+he(0)δ(n), n ≥ 1
[C]
h(n)=2he(n)u(n)-he(0)δ(n), n ≥ 1
[D]
h(n)=2he(n)u(n)-he(0)δ(n), n ≥ 0
Answer: h(n)=2he(n)u(n)-he(0)δ(n), n ≥ 0
(3)
If h(n) is causal and h(n)=he(n)+ho(n),then what is the expression for h(n) in terms of only ho(n)?
[A]
h(n)=2ho(n)u(n)+h(0)δ(n), n ≥ 0
[B]
h(n)=2ho(n)u(n)+h(0)δ(n), n ≥ 1
[C]
h(n)=2ho(n)u(n)-h(0)δ(n), n ≥ 1
[D]
h(n)=2ho(n)u(n)-h(0)δ(n), n ≥ 0
Answer: h(n)=2ho(n)u(n)+h(0)δ(n), n ≥ 1
(4)
If h(n) is absolutely summable, i.e., BIBO stable, then the equation for the frequency response H(ω) is given as?
[A]
HI(ω)-j HR(ω)
[B]
HR(ω)-j HI(ω)
[C]
HR(ω)+j HI(ω)
[D]
HI(ω)+j HR(ω)
(5)
HR(ω) and HI(ω) are interdependent and cannot be specified independently when the system is causal.
(6)
What is the Fourier transform of the unit step function U(ω)?
[A]
πδ(ω)-0.5-j0.5cot(ω/2)
[B]
πδ(ω)-0.5+j0.5cot(ω/2)
[C]
πδ(ω)+0.5+j0.5cot(ω/2)
[D]
πδ(ω)+0.5-j0.5cot(ω/2)
Answer: πδ(ω)+0.5-j0.5cot(ω/2)
(7)
The HI(ω) is uniquely determined from HR(ω) through the integral relationship. This integral is called as Continuous Hilbert transform.
(8)
The magnitude |H(ω)| cannot be constant in any finite range of frequencies and the transition from pass-band to stop-band cannot be infinitely sharp.
(9)
The frequency ωP is called as ______________
[A]
Pass band ripple
[B]
Stop band ripple
[C]
Pass band edge ripple
[D]
Stop band edge ripple
Answer: Pass band edge ripple
(10)
Which of the following represents the bandwidth of the filter?
[A]
ωP+ ωS
[B]
-ωP+ ωS
[C]
ωP-ωS
[D]
None of the mentioned
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