Signal Processing MCQ Questions & Answers

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Each section contains 100 MCQs on Signal Processing .

The unit step response y(t) of a linear system is defined as y(t) = (1 - 3e^-t + 3e^-2t)u(t)
For the system function, the frequency at which the forced response becomes zero is:

A) $$\frac{1}{{\sqrt 2 }}$$ rad/s B) $$\frac{1}{2}$$ rad/s C) $$\sqrt 2 $$ rad/s D) 2 rad/s

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The region of the z plane for which $$\left| {\frac{{z - a}}{{z + a}}} \right| = 1\,\,\left( {\operatorname{Re} a \ne 0} \right)$$ is

A) x-axis B) y-axis C) the straight line z = |a| D) none of these

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Ideal frequency selective filters are

A) causal system B) non causal system C) time invariant system D) time variant system

Discuss

Answer & Solution

Answer: Option A

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Consider a real-valued base-band signal x(t), band limited to 10 kHz. The Nyquist rate for the signal $${\text{y}}\left( {\text{t}} \right) = {\text{x}}\left( {\text{t}} \right){\text{x}}\left( {1 + \frac{{\text{t}}}{2}} \right)$$ is

A) 15 kHz B) 30 kHz C) 60 kHz D) 20 kHz

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The number of complex multiplications required to calculate N-point DFT using radix-2 FFT algorithm is

A) N log₂ N B) $$\frac{{\text{N}}}{2}$$ log₁₀ N C) N log₁₀ N D) $$\frac{{\text{N}}}{2}$$ log₂ N

Discuss

Answer & Solution

Answer: Option D

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Consider the signal x(t) = cos (2πf₀t). Its Hilbert transform is

A) -sin(2πf₀t) B) sin(2πf₀t) C) -cos(2πf₀t) D) cos(2πf₀t)

Discuss

Answer & Solution

Answer: Option B

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In the case of a random variable dealing with non-deterministic signals

A) it is a function from space of outcomes to the real/complex numbers B) it is a function with the probabilities of outcomes as random numbers C) the values assumed by signals are always deterministic D) sometimes the events associated with random variable are deterministic

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Answer & Solution

Answer: Option B

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Laplace transform of the given signal x(t) = u(t - 2) is

A) $$\frac{{{e^{ - 2s}}}}{s}$$ B) $$\frac{1}{s}$$ C) $$\frac{{{e^{ - s}}}}{s}$$ D) $${e^{ - s}}$$

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Answer & Solution

Answer: Option A

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The Fourier transform of the function Sgn(t) defined in the Figure is
Signal Processing mcq question image

A) $$ - \frac{2}{{j\omega }}$$ B) $$\frac{4}{{j\omega }}$$ C) $$\frac{2}{{j\omega }}$$ D) $$\frac{1}{{j\omega }} + 1$$

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Answer & Solution

Answer: Option C

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If x_in(t) = sin(2$$\pi $$ × 4000t) + 0.75sin(2$$\pi $$ × 5000t + $$\frac{\pi }{4}$$) is sampled with F_s = 16000 Hz. Calculate X(0) if $$X\left( m \right) = \sum\nolimits_{n = 0}^{N - 1} {x\left( n \right){e^{ - \frac{{j2\pi nm}}{N}}}} .$$ When N = 8, where x(n) = x_in(nt_s)

A) 0.0 - j4.0 B) 0.0 - j0.0 C) 1.414 + j1.414 D) 0.0 + j4.0

Discuss

Answer & Solution

Answer: Option B

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Signal Processing MCQ Questions & Answers | ECE