Practice Digital Signal Processing Multiple Choice Questions with Answers Quiz-1

Q.1.

DFT is applied to

Infinite sequences
Finite discrete sequences
Continuous infinite signals
Continuous finite sequences

Q.2.

DTFT is the representation of

Periodic Discrete time signals
Aperiodic Discrete time signals
Aperiodic continuous signals
Periodic continuous signals

Q.3.

Telegraph signals are examples of

Digital signals
Analog signals
Impulse signals
Pulse train

Q.4.

The circular convolution of two sequences in time domain is equivalent to

Multiplication of DFTs of two sequences
Summation of DFTs of two sequences
Difference of DFTs of two sequences
Square of multiplication of DFTs of two sequences

Q.5.

Frequency selectivity characteristics of DFT refers to

Ability to resolve different frequency components from input signal
Ability to translate into frequency domain
Ability to convert into discrete signal
None of the above

Q.6.

The interface between an analog signal and a digital processor is

D/A converter
A/D converter
Modulator
Demodulator

Q.7.

The similarity between the Fourier transform and the z transform is that

Both convert frequency spectrum domain to discrete time domain
Both convert discrete time domain to frequency spectrum domain
Both convert analog signal to digital signal
Both convert digital signal to analog signal

Q.8.

Fiber-optic cables are better than copper cables because...

they carry less information
they carry about a thousand times more information per second.
they take up less space
they take up more space

Q.9.

The power of a signal x[n] is defined as:

P=lim⁡N→∞ 11+2N∑n=−NN∣x(n)∣2P=\lim_{N\rightarrow\infty\ }\ \frac{1}{1+2N}\sum_{n=-N}^N\left|x\left(n\right)\right|^2P=N→∞ lim 1+2N1n=−N∑N∣x(n)∣2
P=lim⁡N→∞ 11−2N∑n=−NN∣x[n]∣2P=\lim_{N\rightarrow\infty}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2P=N→∞lim 1−2N1n=−N∑N∣x[n]∣2
P=lim⁡N→0 11−2N∑n=−NN∣x[n]∣2P=\lim_{N\rightarrow0}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2P=N→0lim 1−2N1n=−N∑N∣x[n]∣2
P=lim⁡N→n 12N+1∑−NN∣x[n2]∣P=\lim_{N\rightarrow n}\ \frac{1}{2N+1}\sum_{-N}^N\left|x\left[n^2\right]\right|P=N→nlim 2N+11−N∑N∣∣x[n2]∣∣

Q.10.

Eunice is maintaining the audio levels while her musician is recording a song. What phase of production is Eunice in?

Post-Production
Pre-Production
Production
Final-Production

Q.11.

Technology's goal is to

improve the way people live
give us cool inventions
take all of our time away
make us sleepy

Q.12.

Y[n] = x[n]* δ[n]\delta\left[n\right]δ[n] is

x[n]
\delta\left[n\right]δ[n]
1
x[n] \delta\left[n\right]δ[n]

Q.13.

δ[n] \delta\left[n\right]\ δ[n] can be represented as:

u[n]+u[n+1]
u[n-1]-u[n]
-u[n-1]+u[n]
u[n-1]-u[n+1]

Q.14.

y[n]=ex[n]+1y\left[n\right]=e^{x\left[n\right]}+1y[n]=ex[n]+is

Linear system
Non linear system

Q.15.

If W4100W_4^{100}W= Wx200W_x^{200}Wxthen what is the value of x?

2
4
8
16

Q.16.

If x(n) is a real sequence and X(k) is its N-point DFT, then which of the following is true?

X(N-k)=X(-k)
X(N-k)=X*(k)
X(-k)=X*(k)
All of the mentioned

Q.17.

"Noise" in information technology is considered

small and large tubes
a coded message like morse code
random signals that alter information signals
None of these

Q.18.

Selena feels her video project’s audio needs less echo. Which of the following audio elements should she use?

Audio effects
Voiceover
Background audio
All of above

Q.19.

What audio file format is best for use on the web?

.MP3
.MIDI
.AAC
.WAV

Q.20.

Online services that allow users to listen to music as it is being downloaded uses what type of technology?

Looping
Streaming
Recording
Streaming

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