Signal Processing MCQ Questions & Answers

41

The units of the spectrum obtained by Fourier transforming the covariance function of a stationary stochastic process is

A) power per Hertz B) energy per Hertz C) power per second D) energy per second

Discuss

Answer & Solution

Answer: Option B

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

42

Zero padding are

A) zero appearing in the X(k) sequence B) value of X(k) is zero C) dummy sample added with value 0 in X(k) D) both A and B

Discuss

Answer & Solution

Answer: Option A

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

43

In Digital Filters, how many interpolated data points are inserted between samples when performing 4X over sampling?

A) 2 B) 3 C) 4 D) 5

Discuss

Answer & Solution

Answer: Option B

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

44

Which of the following statement is not true

A) Autocorrelation function and energy spectral density form a Fourier transform pair B) Autocorrelation function of a real valued energy signal is a real valued odd function C) The value of autocorrelation function of a power signal at the origin is equal to the average power of the signal D) Autocorrelation function is the inverse Fourier transform of power spectral density

Discuss

Answer & Solution

Answer: Option B

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

45

Which of the following is not a periodic function of φ?

A) sinφ + π cosφ B) sin(πφ) + cos(πφ) C) sin(φ) + cos(πφ) D) sin(π) + cos(π + φ)

Discuss

Answer & Solution

Answer: Option C

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

46

Which of the following cannot be the Fourier series expansion of a periodic signal?

A) x(t) = 2cost + 3cos3t B) x(t) = 2cosπt + 7cost C) x(t) = cost + 0.5 D) x(t) = 2cos 1.5πt + sin 3.5πt

Discuss

Answer & Solution

Answer: Option B

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

47

A system with input x[n] and output y[n] is given as $$y\left[ n \right] = \left( {\sin \frac{5}{6}\pi n} \right)x\left( n \right).$$
The system is

A) linear, stable and invertible B) non-linear, stable and non-invertible C) linear, stable and non-invertible D) linear, unstable and invertible

Discuss

Answer & Solution

Answer: Option C

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

48

Let F(ω) be the Fourier transform of a function f(t), then F(0) is

A) $$\int\limits_{ - \infty }^\infty {f\left( t \right)dt} $$ B) $$\int\limits_{ - \infty }^\infty {{{\left| {f\left( t \right)} \right|}^2}dt} $$ C) $$\int\limits_{ - \infty }^\infty {{{\left| {tf\left( t \right)} \right|}^2}dt} $$ D) $$\int\limits_{ - \infty }^\infty {tf\left( t \right)dt} $$

Discuss

Answer & Solution

Answer: Option A

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

49

Let P be linearity, Q be time-invariance, R be causality and S be stability. A discrete-time system has the input-output relationship,
\[y\left( n \right) = \left\{ {\begin{array}{*{20}{c}} {x\left( n \right),}&{n \geqslant 1} \\ {0,}&{n = 0} \\ {x\left( {n + 1} \right)}&{n \leqslant - 1} \end{array}} \right.\]
Where x(n) is the input and y(n) is the output.
The above system has the properties

A) P, S but not Q, R B) P, Q, S but not R C) P, Q, R, S D) Q, R, S but not P

Discuss

Answer & Solution

Answer: Option A

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

50

Consider a random sinusoidal signal x(t) = sin(ω₀t + φ), where a random variable 'φ' is uniformly distributed in the range $$ \pm \frac{\pi }{2}.$$ The mean value of x(t) is

A) zerp B) $$\frac{2}{\pi }$$ sin (ω₀t) C) $$\frac{2}{\pi }$$ cos (ω₀t) D) $$\frac{2}{\pi }$$

Discuss

Answer & Solution

Answer: Option B

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

Signal Processing MCQ Questions & Answers | ECE