Question 101 : If x(n)=(0,0,1,2,3,4,0,0) then x(n-1) is:

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

Question 102 : The sampling frequency of the following analog signal, x(t)=4sin150Ļt+2cos50 Ļt is _________

- Greater than 75 Hz
- Less than 150 Hz
- Greater than 150 Hz
- Greater than 50 Hz

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

- 6
- 0
- 12
- 3

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

- product of unit sample sequences
- product of unit step sequences
- weighted sum of unit step sequences.
- 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

- memory
- finite machine
- dual
- 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

- convolution
- Correlation
- transform
- autocorrelation

Question 107 : FIR filters ________ A. are non-recursive B. do not adopt any feedback C. are recursive D. use feedback

- A & B
- C & D
- A & D
- B & C

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

- the output at the present depends on the input at an earlier time
- the output at the present does not depend on the factor of time at all
- the output at the present depends on the input at the current time
- 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 ānā is:

- Zero
- Positive
- Negative
- Not defined

Question 110 : If the output of the system is infinity with an input of x(n) then the system is

- unstable
- stable
- finite
- 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___________

- {10, 10, 10, 6}
- {10, 14, 10, 6}
- {10, 6, 10, 14}
- {10, 10, 6, 14}

Question 112 : Correlation is used for __________________

- quantization
- sampling
- folding
- 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)?

- 50Hz
- 200Hz
- 300Hz
- 100Hz

Question 114 : For N point FFT there are ____complex additions

- N/2 log2N
- N/2
- Nlog2N
- N

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

- Rendering
- Audio signal processing
- Linear filtering.
- Sorting

Question 116 : Classify the given system as Time Variant/In-variant and Linear/Non-linear system y(n)=nx(n)

- Time Variant and Linear
- Time In-variant and Linear
- Time Variant and Non-linear
- Time In-variant and Non-linear

Question 117 : An LTI discrete time system is causal if and only if, __________

- h(n) ā 0 for n < 0
- h(n) = 0 for n < 0
- h(n) ā ā for n < 0
- h(n) ā 0 for n > 0

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

- 32 and 64 respectively
- 16 and 32 respectively
- 80 and 160 respectively
- 12 and 24 respectively

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

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

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

- Height & Weight
- Price & Quatity demanded
- Exam score & TV watching rate
- 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) )

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

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

- a.X1(n) + b.X2(n)
- a.X1(n) - b.X2(n)
- X1(n) + X2(n)
- X1(n) * X2(n)

Question 123 : A relaxed LTI system is one such that

- zero input produces zero output
- zero input produces an output equal to unity
- zero input produces non-zero output
- none of the above

Question 124 : IIR and FIR systems stand for

- Infinite Impulse Response and Finite Impulse Response
- Infinite Impulse Request and Finite Impulse Response
- Infinite Impulse Response and Finite Impulse Request
- 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)

- X(N-k)
- X*(k)
- X*(N-k)
- X*(-k)