Digital Signal Processing MCQs (Chapterwise Multiple Choice Questions)

In DFT equation, the symbol for circularly even sequence is _________.

x (( n ))

x (( n - k ))

x (( -n ))

x ( N-n ) = x ( n )

Answer & Explanation

Correct Answer: x ( N-n ) = x ( n )

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The condition of periodicity for a continuous time signal can be defined mathematically as _______. (Note: Here "To" is the fundamental period.)

x ( t ) = x ( t + 2To )

x ( t ) = x ( t + To/2 )

x ( t ) = x ( t + 4To )

x ( t ) = x ( t + To )

Answer & Explanation

Correct Answer: x ( t ) = x ( t + To )

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How many stages of FFT algorithm are there for an 8-Point DFT?

Three

Two

One

Four

Answer & Explanation

Correct Answer: Three

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Interfacing of digital systems with different sampling rates can be done efficiently by __________.

reduction of the sampling rate

interpolation of the sampling rate

both reduction and interpolation of the sampling rate

keeping the sampling rate constant

Answer & Explanation

Correct Answer: both reduction and interpolation of the sampling rate

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The multiplication of two DFTs is equivalent to the circular convolution of their sequences in the _____________.

frequency domain

time domain

Both frequency and time domains

Neither frequency nor time domain

Answer & Explanation

Correct Answer: time domain

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The Discrete Fourier Transform ( DFT ) of unit impulse function is__________.

Zero

Infinity

1

2

Answer & Explanation

Correct Answer: 1

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In order to avoid aliasing during the reduction of the sampling rate, we divide the sampling frequency by ___________.

D

2D

4D

8D

Answer & Explanation

Correct Answer: 2D

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The term "filter" is used to describe a ___________.

linear time variant system

causal system

non-causal system

linear time invariant system

Answer & Explanation

Correct Answer: linear time invariant system

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In Multirate Digital Signal Processing, the sampling rate of signals __________.

is increased

is decreased

is either increased or decreased

remains constant

Answer & Explanation

Correct Answer: is either increased or decreased

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The circular frequency shift property is also known as __________.

the quadrature modulation theorem

the frequency modulation theorem

the shift modulation theorem

the circular modulation theorem

Answer & Explanation

Correct Answer: the quadrature modulation theorem

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