DSIP Digital Signal & Image Processing MCQ's




Question 61 :
Classify the given system as Time Variant/In-variant and Linear/Non-linear system y(n)=nx(n)

  1. Time Variant and Linear
  2. Time In-variant and Linear
  3. Time Variant and Non-linear
  4. Time In-variant and Non-linear
  

Question 62 :
In neighborhood processing methods

  1. All the pixels in the neighborhood are processed at a time
  2. A pixel in the neighborhood is processed using the current pixel
  3. A pixel is processed using all the pixels within the neighborhood
  4. A pixel is processed using its own current value
  

Question 63 :
FFT may be used to calculate

  1. DFT
  2. Laplace transform
  3. Direct Z transform
  4. In direct Z transform
  

Question 64 :
What is the basic difference between general purpose and DSP processor

  1. More costly
  2. Complex design
  3. Processes in real time
  4. Less reliable
  

Question 65 :
Which filter is best to remove salt and pepper noise?

  1. Low pass
  2. Sobel
  3. Median
  4. Laplacian
  

Question 66 :
In normalized histogram sum of all the values is equal to

  1. 2
  2. 1
  3. 0
  4. -1
  

Question 67 :
Using gray-level transformation, the basic function linearity deals with which of the following transformation?

  1. Log and inverse-log transformations
  2. Negative and identity transformations
  3. nth and nth root transformations
  4. Power-law transformations
  

Question 68 :
Which among the following operations is/are not involved /associated with the computation process of linear convolution?

  1. Folding Operation
  2. Shifting Operation
  3. Multiplication Operation
  4. Integration Operation
  

Question 69 :
Which of the following techniques of boundary descriptions have the physical interpretation of boundary shape?

  1. Fourier transform
  2. Statistical moments
  3. Laplace transform
  4. Curvature
  

Question 70 :
If the output of the system is infinity with an input of x(n) then the system is

  1. unstable
  2. stable
  3. finite
  4. infinite
  

Question 71 :
JPEG format is useful when ___________

  1. There are so many colors in the picture
  2. There are not so many colors in the picture
  3. To show more brightness
  4. To show haziness
  

Question 72 :
An LTI discrete time system is causal if and only if, __________

  1. h(n) ≠ 0 for n < 0
  2. h(n) = 0 for n < 0
  3. h(n) ≠ ∞ for n < 0
  4. h(n) ≠ 0 for n > 0
  

Question 73 :
The interface between an analog signal and a digital processor is

  1. D/A converter
  2. A/D converter
  3. Modulator
  4. Demodulator
  

Question 74 :
4- point DFT requires a total of

  1. 12 multiplications and 10 additions
  2. 10 multiplications and 8 additions
  3. 16 multiplications and 12 additions
  4. 14 multiplications and 12 additions
  

Question 75 :
Convolution of two functions means rotating one function at angle of

  1. 360
  2. 270
  3. 90
  4. 180
  

Question 76 :
Which of the following property makes it possible to calculate 2D DFT using 1D DFT?

  1. conjugate symmetry
  2. Separability
  3. Time shift
  4. Periodicity
  

Question 77 :
Which condition determines the causality of the LTI system in terms of its impulse response?

  1. Only if the value of an impulse response is zero for all negative values of time
  2. Only if the value of an impulse response is unity for all negative values of time
  3. Only if the value of an impulse response is infinity for all negative values of time
  4. Only if the value of an impulse response is negative for all negative values of time
  

Question 78 :
Which of these is not a property of two-dimensional DFT

  1. Symmetric
  2. Periodic extensions
  3. Sampled Fourier transform
  4. Linearity
  

Question 79 :
Logarithmic Transformation is

  1. Used to expand the values of dark pixels in an image while compressing the higher-level values.
  2. Used to compress the values of dark pixels in an image while expanding the higher-level values
  3. Used to compress the dynamic range of images with small variations in pixel values.
  4. Used to expand the dynamic range of image with large variations in pixel values
  

Question 80 :
Which transformations are useful for general-purpose contrast manipulation

  1. Power law transformations
  2. Identity transformation
  3. Negative transformation
  4. Logarithmic transformation
  

Question 81 :
Overlap-add method is an efficient way to evaluate the discrete _______ of a very long signal with a finite impulse response filter

  1. convolution
  2. Correlation
  3. transform
  4. autocorrelation
  

Question 82 :
If a signal x(n) is passed through a system to get an output signal y(n) =x(n+1), then the signal is said to be

  1. Delayed
  2. Advanced
  3. No operation
  4. Inversed
  

Question 83 :
If x(n)=(0,0,1,2,3,4,0,0) then x(n-1) is:

  1. (0,0,2,4,6,8,0,0)
  2. (0,0,1,2,3,4,0,0)
  3. (1,2,3,4,0,0,0,0)
  4. (0,0,0,1,2,3,4)
  

Question 84 :
To reduce the effect of aliasing high frequencies are

  1. Attenuated
  2. Accentuated
  3. Reduced
  4. Removed
  

Question 85 :
The 4-point DFT of {1,1,0,0} is

  1. { 2, 1-j, 0, 1+j }
  2. { -2, 1-j, 0, 1+j }
  3. { 4, 1-j, 0, 1+j }
  4. { -2, 1-j, 0, 1-j }
  

Question 86 :
Fourier transform of unit impulse at origin is

  1. Undefined
  2. Infinity
  3. 1
  4. 0
  

Question 87 :
The sampling frequency of the following analog signal, x(t)=4sin150πt+2cos50 πt is _________

  1. Greater than 75 Hz
  2. Less than 150 Hz
  3. Greater than 150 Hz
  4. Greater than 50 Hz
  

Question 88 :
DWT stands for

  1. Discrete wavelet transform
  2. Discrete wavelet transformation
  3. Digital wavelet transform
  4. Digital wavelet transformation
  

Question 89 :
Which segmentation technique is based on clustering approaches?

  1. K-means algorithm
  2. Threshold based algorithm
  3. Histogram based algorithm
  4. Edge detection based algorithm
  

Question 90 :
FIR filters ________ A. are non-recursive B. do not adopt any feedback C. are recursive D. use feedback

  1. A - B
  2. C - D
  3. A - D
  4. B - C
  
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