Quiz  /  Digital Signal Processing Gate & PSU MCQ Questions With Answers

  • 1. 
    When audio editing is complete, which of the following formats would be the best choice for export?

  • .PNG
  • .MP3
  • .AVI
  • All of above

  • 2. 
    Any unwanted signal interfering with the main signal is

  • System
  • Noise
  • Frequency
  • None

  • 3. 
    Which type of signal is represented by discrete values?

  • Nois signal
  • Non linear
  • Analog
  • Digital

  • 4. 
    DTFT is the representation of

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

  • 5. 
    As compared to the analog systems, the digital processing of signals allow1) Programmable operations2) Flexibility in the system design3) Cheaper systems4) More reliability

  • 1, 2 and 3 are correct
  • 1 and 2 are correct
  • 1, 2 and 4 are correct
  • All the four are correct

  • 6. 
    How many complex multiplications are need to be performed to calculate chirp z-transform?(M=N+L-1)

  • log2M
  • Mlog2M
  • (M-1)log2M
  • Mlog2(M-1)

  • 7. 
    Kim is placing background music under her voiceover in an advertisement. What editing technique should she use to remove part of the music at the end of the recording?

  • Fading
  • Looping
  • Trimming
  • All of above

  • 8. 
    Reverb time (RT 60) is the amount of time it takes for a reverberated signal to reach -60db below the direct sound level.

  • True
  • False

  • 9. 
    If X1(k) and X2(k) are the N-point DFTs of X1(n) and x2(n) respectively, then what is the N-point DFT of x(n)=ax1(n)+bx2(n)?

  • X1(ak)+X2(bk)
  • aX1(k)+bX2(k)
  • eakX1(k)+ebkX2(k)
  • None of the mentioned

  • 10. 
    Why is it important to understand how a mixing console works when recording audio?

  • You will need to use one to record voiceovers
  • You will need to use one to record instruments
  • It is the basis for the interface in audio editing software
  • All of above

  • 11. 
    The condition for a system to be causal is

  • All poles of its transfer function must be left half of s-plane
  • All poles of its transfer function must be right half of s-plane
  • All zeros of its transfer function must be right half of s-plane
  • All zeros of its transfer function must be left half of s-plane

  • 12. 
    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

  • 13. 
    Telegraph signals are examples of

  • Digital signals
  • Analog signals
  • Impulse signals
  • Pulse train

  • 14. 
    When recording audio, how are the channels used?

  • One channel records all the instruments and one records microphones
  • Each channel records a separate audio input
  • Only one channel can be recorded at a time
  • All of above

  • 15. 
    What is the configuration of system for digital processing of an analog signal?

  • Analog signal->Pre-filter ->D/A Converter -> Digital Processor -> A/D Converter -> Post-filter
  • Analog signal-> Pre-filter ->A/D Converter -> Digital Processor -> D/A Converter -> Post-filter
  • Analog signal-> Post-filter ->D/A Converter -> Digital Processor -> A/D Converter -> Pre-filter
  • None of the above

  • 16. 
    Which of the following is not related to dynamic level processing?

  • flanger
  • limiter
  • gate
  • expander

  • 17. 
    Which of the following characterizes an analog quantity?

  • Discrete levels represent changes in a quantity.
  • Its values follow a logarithmic response curve.
  • It can be described with a finite number of steps.
  • It has a continuous set of values over a given range.

  • 18. 
    The condition for a system to be stable is

  • All poles of its transfer function lie on the left half of s-plane
  • All poles of its transfer function must be right half of s-plane
  • All zeros of its transfer function must be right half of s-plane
  • All zeros of its transfer function must be left half of s-plane

  • 19. 
    The basic properties of DFT includes1) Linearity2) Periodicity3) Circular symmetry4) Summation

  • 1, 2 and 3 are correct
  • 1, 2 and 4 are correct
  • 1 and 3 are correct
  • All the four are correct

  • 20. 
    What audio file format is best for use on the web?

  • .MP3
  • .MIDI
  • .AAC
  • .WAV

  • 21. 
    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]

  • 22. 
    If W4100W_4^{100}W4100​ = Wx200W_x^{200}Wx200​ then what is the value of x?

  • 2
  • 4
  • 8
  • 16

  • 23. 
    Why are gates used when miking a drum kit?

  • used to isolate drum sounds on a track
  • to allow drums to bleed together in mix

  • 24. 
    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

  • 25. 
    Quantized and coded version of the discrete time signals are

  • Analog signals
  • Digital signals
  • Both A and B
  • Coded signal

  • 26. 
    What is the transform that is suitable for evaluating the z-transform of a set of data on a variety of contours in the z-plane?

  • Goertzel Algorithm
  • Fast Fourier transform
  • Chirp-z transform
  • None of the mentioned

  • 27. 
    Which control is not typical on a compressor?

  • Threshold
  • Attack
  • Release
  • Ratio
  • Frequency

  • 28. 
    If x(n) and X(k) are an N-point DFT pair, then X(k+N)=?

  • X(-k)
  • -X(k)
  • X(k)
  • None of the mentioned

  • 29. 
    If the contour is a circle of radius r and the zk are N equally spaced points, then what is the value of zk?

  • re-j2πkn/N
  • rejπkn/N
  • rej2πkn
  • rej2πkn/N
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