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# Test answers for Digital Signal Processing Test 2020

(69) Last updated: January 27
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## 69 NOT Answered Yet Test Questions:

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`1. Thermal noise can be considered to be ___________.`

• white non-Gaussian noise

• white Gaussian noise

• flicker noise

• transit time noise

`2. For the signal x ( t ) = 3cos50πt + 10sin300πt – cos100πt , nyquist rate is________.`

• 150 Hz

• 300 Hz

• 100 Hz

• 50 Hz

`3. If a Z-Transform is evaluated on the unit circle at evenly spaced points only, it becomes __________.`

• FFT

• DTFT

• FT

• DFT

`4. In DFT, a circularly folded sequence is denoted by_________.`

• x (( n ))

• x (( n/2 ))

• x (( 2n ))

• x (( -n ))

`5. A non-periodic signal has a period ( T ) of _______.`

• T = ∞

• T = 0

• T = 1

• T = 2

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

• Zero

• Infinity

• 1

• 2

`7. How many clock cycles are required by the DSP processor to execute an instruction?`

• One

• Two

• Four

• Eight

`8. In order to design digital filter, an important condition is that, the response of filter should ___________.`

• causal

• non-causal

• time-variant

• time-invariant

`9. Sampling rate conversion by the rational number ( I / D = 1023 / 511 ) needs a polyphase filter with _________.`

• 511 subfilters

• 500 subfilters

• 1000 subfilters

• 1023 subfilters

`10. Environmental parameters like temperature, humidity etc. change the performance of __________.`

• analog filters only

• digital Filters only

• Both analog and digital filters

• Neither analog nor digital filters

`11. 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

`12. A continuous time signal is said to be symmetrical or even if it satisfies the condition, _________.`

• x ( t ) = x ( t/2 )

• x ( t ) = x (√t )

• x ( t ) = x ( 2t )

• x ( t ) = x ( -t )

`13. Which one of the following is not a register associated with the Program Sequencer?`

• Arithmetic Status Register (ASTAT)

• Stack Status Register (SSTAT)

• Mode Status Register (MSTAT)

• System Register

`14. Digital F.I.R. filters are so designed that they have linear phase characteristics in the  _____________.`

• stop band

• pass band

• low pass band

• high pass band

`15. Continuous time signals have_____________.`

• periodic spectra

• discrete spectra

• aperiodic spectra

• continuous spectra

`16. The condition of periodicity for a discrete time signal can be defined mathematically as ________. (Note: Here Number 'N' is the period of the signal.)`

• x ( n ) = x ( n + N/2 )

• x ( n ) = x ( n + 2N )

• x ( n ) = x ( n + N )

• None of the above

`17. MAC is used for ___________.`

• high speed multiplication

• high speed division

• high speed subtraction

`18. Quantization of a signal_____________.`

• reduces bandwidth requirement

• increases bandwidth requirement

• does not have any effect on bandwidth

`19. The fundamental period of signal 10sin(12πt) + 4sin(18πt) is______.`

• 2/3 Sec

• 1/2 Sec

• 1/3 Sec

• 1/4 Sec

`20. Which one of the following is a static system?`

• y ( n ) = x ( n2 )

• y ( n ) = x ( n ) - 3 x (n - 2)

• y ( n ) = x ( - n )

• y ( n ) = n x ( n )

`21. Signals that are statistically stationary can be better estimated with  _________.`

• Short data record

• Long data record

• Average data record

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

• D

• 2D

• 4D

• 8D

`23. 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

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

• x (( n ))

• x (( n - k ))

• x (( -n ))

• x ( N-n ) = x ( n )

`25. Which of the following is a non-causal system?`

• y ( n ) = x ( n ) + x ( n - 2 )

• y ( n ) = e x (n)

• y ( n ) = cos x ( n )

• y ( n ) = x ( n ) + n x ( n - 1 )

`26. The type-1 chebyshev filter contains __________.`

• all zeros

• all poles

• zeros as well as poles

• No poles and zeros

`27. A continuous time signal is also known as a/an_______.`

• analog signal

• digital signal

• even signal

• odd signal

`28. The ADSP-2100A has  ____________.`

• no on-chip memory

• on-chip memory

• attached memory

• both on-chip and attached memories

`29. The periodogram is _________.`

• not a consistent estimate of the true power density spectrum

• a consistent estimate of the true power density spectrum

• not a consistent estimate of the true energy density spectrum

• a consistent estimate of the true energy density spectrum

`30. What is the function of  a Fourier Transform?`

• It converts the time domain signal into the frequency domain signal

• It converts the frequency domain signal into the time domain signal

• It converts the time domain signal into the phase domain signal

• It converts the frequency domain signal into the phase domain signal

`31. The Harvard Architecture referred to the computer architectures that used _____________.`

• the same data storage for instructions and data

• separate data storages for instructions and data

• no storage for instructions and data

• storage for instructions only

`32. The finite impulse response ( F.I.R ) filters are also called_________.`

• recursive filters

• feedback filters

• non-recursive filters

• notch filters

`33. The process of reducing the sampling rate by a factor D is called ___________.`

• Decimation

• Interpolation

• Dissemination

• Reduction

`34. The parametric methods for Power Spectrum Estimation provide __________.`

• better phase resolution

• better amplitude resolution

• better frequency resolution

• better leakage effects

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

• Three

• Two

• One

• Four

`36. The MUSIC ( Multiple Signal Classification ) method is used for ____________.`

• estimation of power spectrum

• estimation of spectral leakage effects

• estimation of amplitude distortion

• estimation of noise frequency

`37. The frequency warping effect occurs because of___________.`

• linear mapping

• frequency expansion

• amplitude attenuation

• non-linear mapping

`38. Digital Transmultiplexers are devices for converting ___________.`

• analog to digital signals

• digital to analog signal

• TDM to FDM

• FDM to CDMA

`39. Any arbitrary signal can be expressed as the sum of two signals. These two signals must be_________.`

• even and odd signals

• periodic and non-periodic signals

• energy and power signals

• deterministic and random signals

`40. Linear predictive coding is normally used to achieve __________.`

• light synthesis

• noise synthesis

• phase synthesis

• speech synthesis

`41. The ADSP-21XX family supports  __________.`

• a 32-bit instruction word

• an 8-bit instruction word

• a 16-bit instruction word

• a 24-bit instruction word

`42. Comb Filters can be viewed as ___________.`

• notch filters

• digital resonators

• all pass filters

• mirror filters

`43. Power signals are the signals having ________.`

• infinite non zero power

• infinite zero power

• finite non zero power

• finite zero power

`44. An analog filter is stable if the poles lie  ________________.`

• on the R.H.S. of the S-Plane

• on the L.H.S. of the S-Plane

• inside the unit circle in the Z-domain

• outside the unit circle in the Z-domain

`45. DFT is obtained from DTFT by putting____________.`

• W = 2πK / N

• W = K / N

• W = πK / 2N

• W = 4πK / N

`46. In a Butterworth approximation for bilinear transformation, we have,`

• Ω= 2 / Ts tan ωc/ 4

• Ω= 1 / Ts tan ωc / 2

• Ω= 2 / Ts tan ωc / 2

• Ω = 1 / Ts tan ωc / 3

`47. For the signal x ( t ) = 3cos600πt + 2cos1800πt , the folding frequency is __________.`

• 600 Hz

• 1800 Hz

• 900 Hz

• 500 Hz

`48. The circular frequency shift property is also known as __________.`

• the frequency modulation theorem

• the shift modulation theorem

• the circular modulation theorem

`49. The non-parametric methods for power spectrum estimation suffer from________.`

• phase distortion

• spectrum leakage effects

• amplitude distortion

• None of the above

`50. The Flanging effect is a ____________.`

• light effect

• vibration effect

• sound effect

• microwave signal effect

`51. Which of the following systems is unstable?`

• y ( n ) = cos [ x ( n ) ]

• y ( n ) = x ( - n )

• y ( n ) = x ( 2 n )

• None of the above

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

• linear time variant system

• causal system

• non-causal system

• linear time invariant system

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

• is increased

• is decreased

• is either increased or decreased

• remains constant

`54. The signal cos(0.01πn) is_________.`

• non-periodic

• periodic

• an analog signal

• None of the above

`55. The ALU of the ADSP 21XX family has two input ports named __________.`

• A and B

• D and E

• X and Y

• H and L

`56. The sampling theorem holds true for the following condition________. (Note:  Here 'fs' is the sampling frequency, and 'w' is the maximum frequency of the continuous time signal x (t)).`

• fs < 2 ω

• fs > 2 ω

• fs < ω / 2

• fs > ω / 2

`57. Which one of the following is not a universal register of the ADSP21XX  family?`

• Program Sequencer

• System Register

• Multiplier Results (MR)

`58. A discrete time signal can be best analyzed by____________.`

• a fourier transform

• a laplace transform

• a Z- Transform

• none of the above

`59. Which of the following is a time invariant system?`

• y ( n ) = x ( n ) + n x ( n - 1 )

• y ( n ) = y ( n - 4 ) + x (n - 4)

• y ( n ) = x ( 2 n )

• y ( n ) = x (- n )

`60. The Z-Transform is used to analyze ____________.`

• continuous time signals

• discrete time signals

• random signals

• noise signals

`61. 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 )

`62. A stationary random process is a_________.`

• finite energy signal

• zero energy signal

• infinite energy signal

`63. The ARMA Linear Model is a __________.`

• non-parametric method

• parametric method

• periodogram method

• eigen-decomposition method

`64. In a Butterworth low pass filter, we get a maximally flat response of  ___________.`

• Pass Band

• Stop Band

• Transition Band

• High Pass Band

`65. The overlap save method is for the ___________.`

• modulation of signals

• filtering of signals

• attenuation of Signals

• amplification of signals

`66. Anti-aliasing filter is basically a________.`

• high pass filter

• low pass filter

• band pass filter

• band stop filter

`67. Which of the following is a linear system?`

• y ( n ) = n x ( n )

• y ( n ) = e x (n)

• y ( n ) = a x ( n ) +6

• y ( n ) = cos x ( n )

`68. The Kaiser window design is used for ____________.`

• butterworth filters

• Chebyshev filters

• Elliptic filters

• F.I.R. filters

`69. The aliasing problem can be better handled by the__________.`