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+2N1​n=−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​ 1−2N1​n=−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​ 1−2N1​n=−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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