# Digital Signal And Image Processing MCQ

Question 101 : 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 102 : 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 103 : What is X(0) for four point sequence x(n)={0,1,2,3}?

1. 6
2. 0
3. 12
4. 3

Question 104 : Any arbitrary input signal can be decomposed and represented as a

1. product of unit sample sequences
2. product of unit step sequences
3. weighted sum of unit step sequences.
4. weighted sum of unit sample sequences.

Question 105 : DSPs often use special------------ architectures that are able to fetch multiple data or instructions at the same time

1. memory
2. finite machine
3. dual
4. fast

Question 106 : 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 107 : 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

Question 108 : A system is said to be defined as non causal, when

1. the output at the present depends on the input at an earlier time
2. the output at the present does not depend on the factor of time at all
3. the output at the present depends on the input at the current time
4. the output at the present depends on the input at a time instant in the future

Question 109 : If x(n) is a discrete-time signal, then the value of x(n) at non integer value of ‘n’ is:

1. Zero
2. Positive
3. Negative
4. Not defined

Question 110 : 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 111 : The circular convolution of two periodic signals represented by x1[n] = {2, 1, 2, -1} and x2[n] = {1, 2, 3, 4} is___________

1. {10, 10, 10, 6}
2. {10, 14, 10, 6}
3. {10, 6, 10, 14}
4. {10, 10, 6, 14}

Question 112 : Correlation is used for __________________

1. quantization
2. sampling
3. folding
4. computing average power in waveforms

Question 113 : What is the Nyquist rate of the signal x(t)=3cos(50*pi*t)+10sin(300*pi*t)-cos(100*pi*t)?

1. 50Hz
2. 200Hz
3. 300Hz
4. 100Hz

Question 114 : For N point FFT there are ____complex additions

1. N/2 log2N
2. N/2
3. Nlog2N
4. N

Question 115 : Linear convolution can be used to find the response of

1. Rendering
2. Audio signal processing
3. Linear filtering.
4. Sorting

Question 116 : 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 117 : 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 118 : For a 16-point FFT, the number of complex multiplication and addition is

1. 32 and 64 respectively
2. 16 and 32 respectively
3. 80 and 160 respectively
4. 12 and 24 respectively

Question 119 : The x(n)={2,0,0,1},DFT of 4 point sequence is

1. X(K)={3,2+j,1, 2-j}
2. X(K)={2,-2-2j,-2, ,-2+2j}
3. X(K)={3,0 ,-2+2j ,-2-2j}
4. X(K)={6,-2-2j,2, ,-2+2j}

Question 120 : Identify in which case positive correlation exist among the variables

1. Height & Weight
2. Price & Quatity demanded
3. Exam score & TV watching rate
4. Height & IQ

Question 121 : The impulse response of a linear time-invariant system is h(n)=[4,5,6,7]. Determine the response of the system to the input signal x(n)=[1,2,3,4] (Origin:7 in h(n) and 1 in x(n) )

1. [4,10,25,50,52,55,28] (Origin:25)
2. [30,43,23,26] (Origin:23)
3. [4,13,28,50,52,45,28] (Origin:50)
4. 10,23,21,45,36,43] (Origin:10)

Question 122 : Linearity property of DFT states that, a.x1(n) + b.x2(n) =

1. a.X1(n) + b.X2(n)
2. a.X1(n) - b.X2(n)
3. X1(n) + X2(n)
4. X1(n) * X2(n)

Question 123 : A relaxed LTI system is one such that

1. zero input produces zero output
2. zero input produces an output equal to unity
3. zero input produces non-zero output
4. none of the above

Question 124 : IIR and FIR systems stand for

1. Infinite Impulse Response and Finite Impulse Response
2. Infinite Impulse Request and Finite Impulse Response
3. Infinite Impulse Response and Finite Impulse Request
4. Infinite Impulse Request and Finite Impulse Request

Question 125 : If X(k) is the N-point DFT of a sequence x(n), then what is the DFT of x*(n)

1. X(N-k)
2. X*(k)
3. X*(N-k)
4. X*(-k)

• chevron_left
• 1
• 2
• 3
• chevron_right