Signal Processing MCQ Questions & Answers

11

The discrete equation y(n + 1) + 0.5ny(n) = 0.5x(n + 1) is not attributable to a

A) Memory less system B) Time-varying system C) Linear system D) Causal system

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Answer & Solution

Answer: Option C

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12

Which one of the following systems is a causal system?

A) y(t) = sin(t + 3) B) y(t) = u(t) + u(t - 1) C) y(t) = u(t) + u(t + 1) D) y(t) = sin(t - 3) + sin(t + 3)

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Answer & Solution

Answer: Option B

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13

The impulse response h[n] of a linear time-invariant system is given by h[n] = u[n + 3] + u[n - 2] - 2u[n - 7] where u[n] is the unit step sequence. The above system is

A) stable and causal B) stable but not causal C) unstable and not causal D) causal but unstable

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Answer & Solution

Answer: Option B

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14

If z₀ is a zero of a (real-valued) linear-phase FIR filter then following is/are also zero/zeros of a (real-valued) linear-phase FIR filter,

A) $${\text{z}}_0^ * $$ B) $$\frac{1}{{{{\text{z}}_0}}}$$ C) $$\frac{1}{{{{\text{z}}_0}}},\,{\text{z}}_0^ * {\text{ and }}\frac{1}{{{\text{z}}_0^ * }}$$ D) $$\frac{1}{{{{\text{z}}_0}}}\,{\text{and}}\,\frac{1}{{{\text{z}}_0^ * }}$$

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Answer & Solution

Answer: Option C

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15

A non zero DC signal pass through a low pass filter then output is

A) Less than input B) more than input C) Same as input D) zero

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Answer & Solution

Answer: Option C

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16

It is possible to compute the cross-correlation R_xy(τ) between two signals x(t) and y(t) directly from their convolution provided

A) x(t) has even symmetry B) x(t) has odd symmetry C) y(t) has odd symmetry D) y(t) has even symmetry

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Answer & Solution

Answer: Option D

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17

A discrete LTI system is non-causal if its impulse response is

A) aⁿU(n - 2) B) a^{n - 2}U(n) C) a^{n + 2}U(n) D) aⁿU(n + 2)

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Answer & Solution

Answer: Option D

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18

The linear constant coefficient difference equation $$y\left( n \right) - \frac{1}{2}y\left( {n - 1} \right) = x\left( n \right) + \frac{1}{3}x\left( {n - 1} \right)$$ lead to

A) $$\frac{{Y\left( Z \right)}}{{X\left( Z \right)}} = \frac{{1 + \frac{1}{3}{Z^{ - 1}}}}{{1 + \frac{1}{2}{Z^{ - 1}}}}$$ B) $$\frac{{Y\left( Z \right)}}{{X\left( Z \right)}} = \frac{{1 - \frac{1}{3}{Z^{ - 1}}}}{{1 - \frac{1}{2}{Z^{ - 1}}}}$$ C) $$\frac{{Y\left( Z \right)}}{{X\left( Z \right)}} = \frac{{1 - \frac{1}{3}{Z^{ - 1}}}}{{1 + \frac{1}{2}{Z^{ - 1}}}}$$ D) $$\frac{{Y\left( Z \right)}}{{X\left( Z \right)}} = \frac{{1 + \frac{1}{3}{Z^{ - 1}}}}{{1 - \frac{1}{2}{Z^{ - 1}}}}$$

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Answer & Solution

Answer: Option D

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19

If the lower limit of Region of Convergence (ROC) is greater than the upper limit of ROC, the series $$X\left( z \right) = \sum\nolimits_{n = - \infty }^\infty {x\left( n \right){z^{ - n}}} $$

A) Converges B) Zero C) Does not converge D) None of the above

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Answer & Solution

Answer: Option C

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20

A rectangular pulse train s(t) as shown in the figure is convolved with the signal cos²(4π × 10³t). The convolved signal will be a
Signal Processing mcq question image

A) DC B) 12 kHz sinusoid C) 8 kHz sinusoid D) 14 kHz sinusoid

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Answer & Solution

Answer: Option A

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Signal Processing MCQ Questions & Answers | ECE