Explore topic-wise MCQs in Digital Communications.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.

1.

Autocorrelation function of periodic signal is equal to _______

A. Energy of the signal
B. Power of the signal
C. Its area in frequency domain
D. None of the mentioned
Answer» C. Its area in frequency domain
Discussion
2.

Autocorrelation is maximum at _______

A. Unity
B. Origin
C. Infinite point
D. None of the mentioned
Answer» C. Infinite point
Discussion
3.

Autocorrelation is a function of

A. Time
B. Frequency
C. Time difference
D. Frequency difference
Answer» D. Frequency difference
Discussion
4.

Autocorrelation is a function which matches

A. Two same signals
B. Two different signal
C. One signal with its delayed version
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
5.

According to Parseval’s theorem the energy spectral density curve is equal to?

A. Area under magnitude of the signal
B. Area under square of the magnitude of the signal
C. Area under square root of magnitude of the signal
D. None of the mentioned
Answer» C. Area under square root of magnitude of the signal
Discussion
6.

AUTOCORRELATION_IS_A_FUNCTION_OF?$

A. Time
B. Frequency
C. Time difference
D. Frequency difference
Answer» D. Frequency difference
Discussion
7.

Autocorrelation function of periodic signal is equal to _______$

A. Energy of the signal
B. Power of the signal
C. Its area in frequency domain
D. None of the mentioned
Answer» C. Its area in frequency domain
Discussion
8.

Autocorrelation_is_maximum_at________$

A. Unity
B. Origin
C. Infinite point
D. None of the mentioned
Answer» C. Infinite point
Discussion
9.

Autocorrelation function of white noise will have?

A. Strong peak
B. Infinite peak
C. Weak peak
D. None of the mentioned
Answer» B. Infinite peak
Discussion
10.

Autocorrelation is a _______ function.

A. Real and even
B. Real and odd
C. Complex and even
D. Complex and odd
Answer» B. Real and odd
Discussion
11.

Autocorrelation is a function which matche?

A. Two same signals
B. Two different signal
C. One signal with its delayed version
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
12.

Spectogram is the graph plotted against?

A. Frequency domain
B. Time domain
C. Frequency & Time domain
D. None of the mentioned
Answer» C. Frequency & Time domain
Discussion
13.

According to Parseval’s theorem the energy spectral density curve is equal to?$

A. Area under magnitude of the signal
B. Area under square of the magnitude of the signal
C. Area under square root of magnitude of the signal
D. None of the mentioned
Answer» C. Area under square root of magnitude of the signal
Discussion
14.

What is Wiener-Khinchin theorem?

A. Spectral density and auto-covariance makes a fourier transform pair
B. Spectral density and auto-correlatioon makes a fourier tranform pair
C. Spectral density and variance makes a fourier tranform pair
D. None of the mentioned
Answer» C. Spectral density and variance makes a fourier tranform pair
Discussion
15.

How can power spectral density of non periodic signal be calculated?

A. By integrating
B. By truncating
C. By converting to periodic
D. None of the mentioned
Answer» C. By converting to periodic
Discussion
16.

Power spectrum describes distribution of _________ under frequency domain.

A. Mean
B. Variance
C. Gaussian
D. None of the mentioned
Answer» C. Gaussian
Discussion
17.

Energy spectral density defines

A. Signal energy per unit area
B. Signal energy per unit bandwidth
C. Signal power per unit area
D. Signal power per unit bandwidth
Answer» C. Signal power per unit area
Discussion
18.

Power spectral density function is a?

A. Real and even function
B. Non negative function
C. Periodic
D. All of the mentioned
Answer» E.
Discussion