Digital Signal Processing Test Questions Set - 2

1)   The cost of the digital processors is cheaper because

a. Processor allows time sharing among a number of signals
b. The hardware is cheaper
c. Require less maintenance
d. Less power consumption
 Answer  Explanation  Related Ques ANSWER: Processor allows time sharing among a number of signals Explanation: No explanation is available for this question!

2)   The operations that may be performed on vectors in Euclidean Space are

1) Inner product, distance between vectors
2) Norm of a vector, orthogonal vectors
3) Orthonormal functions
4) Vector division

a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 1, 2 and 4 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 1, 2 and 3 are correct Explanation: No explanation is available for this question!

3)   The norm or length of a signal is given by

a. The square of the energy of the signal
b. The square root of the energy of the signal
c. The inverse of the energy of the signal
d. The cube root of the energy of the signal
 Answer  Explanation  Related Ques ANSWER: The square root of the energy of the signal Explanation: No explanation is available for this question!

4)   The principle of Gram-Schmidt Orthogonalization (GSO) states that, any set of M energy signals can be expressed as

a. Summation of N ortho normal basis functions, where N ≤ M.
b. Linear combinations of N ortho normal basis functions, where N ≤ M.
c. Product of logarithmic combinations of N ortho normal basis functions, where N ≤ M.
d. Product of inverse squares of N ortho normal basis functions, where N ≤ M.
 Answer  Explanation  Related Ques ANSWER: Linear combinations of N ortho normal basis functions, where N ≤ M. Explanation: No explanation is available for this question!

5)   A signal x[n] is anti symmetric or odd when

a. x[-n] = x[n] • x[n]
b. x[n] = -x[n]
c. x[n] = [x[n]]2
d. x[-n] = -x[n]
 Answer  Explanation  Related Ques ANSWER: x[-n] = -x[n] Explanation: No explanation is available for this question!

6)   Time shifting of discrete time signal means

a. y[n] = x[n-k]
b. y[n] = x[-n-k]
c. y[n] = -x[n-k]
d. y[n] = x[n+k]
 Answer  Explanation  Related Ques ANSWER: y[n] = x[n-k] Explanation: No explanation is available for this question!

7)   Time reversal of a discrete time signal refers to

a. y[n] = x[-n+k]
b. y[n] = x[-n]
c. y[n] = x[-n-k]
d. y[n] = x[n-k]
 Answer  Explanation  Related Ques ANSWER: y[n] = x[-n] Explanation: No explanation is available for this question!

8)   Causal systems are the systems in which

a. The output of the system depends on the present and the past inputs
b. The output of the system depends only on the present inputs
c. The output of the system depends only on the past inputs
d. The output of the system depends on the present input as well as the previous outputs
 Answer  Explanation  Related Ques ANSWER: The output of the system depends on the present and the past inputs Explanation: No explanation is available for this question!

9)   The basic properties of DFT includes

1) Linearity
2) Periodicity
3) Circular symmetry
4) Summation

a. 1, 2 and 3 are correct
b. 1, 2 and 4 are correct
c. 1 and 3 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 1, 2 and 3 are correct Explanation: No explanation is available for this question!

10)   Padding of zeros increases the frequency resolution.

a. True
b. False

 Answer  Explanation  Related Ques ANSWER: False Explanation: No explanation is available for this question!

11)   Circular shift of an N point is equivalent to

a. Circular shift of its periodic extension and its vice versa
b. Linear shift of its periodic extension and its vice versa
c. Circular shift of its aperiodic extension and its vice versa
d. Linear shift of its aperiodic extension and its vice versa
 Answer  Explanation  Related Ques ANSWER: Linear shift of its periodic extension and its vice versa Explanation: No explanation is available for this question!

12)   The circular convolution of two sequences in time domain is equivalent to

a. Multiplication of DFTs of two sequences
b. Summation of DFTs of two sequences
c. Difference of DFTs of two sequences
d. Square of multiplication of DFTs of two sequences
 Answer  Explanation  Related Ques ANSWER: Multiplication of DFTs of two sequences Explanation: No explanation is available for this question!

13)   For the calculation of N- point DFT, Radix -2 FFT algorithm repeats

a. 2(N Log2 N) stages
b. (N Log2 N)2/2 stages
c. (N Log2 N)/2 stages
d. (N Log2(2 N))/2 stages
 Answer  Explanation  Related Ques ANSWER: (N Log2 N)/2 stages Explanation: No explanation is available for this question!

14)   Radix - 2 FFT algorithm performs the computation of DFT in

a. N/2Log2 N multiplications and 2Log2 N additions
b. N/2Log2 N multiplications and NLog2 N additions
c. Log2 N multiplications and N/2Log2 N additions
d. NLog2 N multiplications and N/2Log2 N additions
 Answer  Explanation  Related Ques ANSWER: N/2Log2 N multiplications and NLog2 N additions Explanation: No explanation is available for this question!

15)   The overlap save method is used to calculate

a. The discrete convolution between a sampled signal and a finite impulse response (FIR) filter
b. The discrete convolution between a sampled signal and an infinite impulse response (IIR) filter
c. The discrete convolution between a very long signal and a finite impulse response (FIR) filter
d. The discrete convolution between a very long signal and a infinite impulse response (IIR) filter
 Answer  Explanation  Related Ques ANSWER: The discrete convolution between a very long signal and a finite impulse response (FIR) filter Explanation: No explanation is available for this question!

16)   Overlap-Add Method Deals with principles that

a. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length L + M - 1
b. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length L + M
c. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length 2L + M - 1
d. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length 2L + 2M - 1
 Answer  Explanation  Related Ques ANSWER: The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length L + M - 1 Explanation: No explanation is available for this question!

17)   ROC does not have

a. zeros
b. poles
c. negative values
d. positive values
 Answer  Explanation  Related Ques ANSWER: poles Explanation: No explanation is available for this question!

18)   Damping is the ability of a system

a. To support oscillatory nature of the system’s transient response
b. To oppose the continuous nature of the system's transient response
c. To oppose the oscillatory nature of the system's transient response
d. To support the discrete nature of the system's transient response
 Answer  Explanation  Related Ques ANSWER: To oppose the oscillatory nature of the system's transient response Explanation: No explanation is available for this question!

19)   The condition for a system to be causal is

a. All poles of its transfer function must be left half of s-plane
b. All poles of its transfer function must be right half of s-plane
c. All zeros of its transfer function must be right half of s-plane
d. All zeros of its transfer function must be left half of s-plane
 Answer  Explanation  Related Ques ANSWER: All poles of its transfer function must be right half of s-plane Explanation: No explanation is available for this question!

20)   The condition for a system to be stable is

a. All poles of its transfer function lie on the left half of s-plane
b. All poles of its transfer function must be right half of s-plane
c. All zeros of its transfer function must be right half of s-plane
d. All zeros of its transfer function must be left half of s-plane
 Answer  Explanation  Related Ques ANSWER: All poles of its transfer function lie on the left half of s-plane Explanation: No explanation is available for this question!

21)   Partial fraction method involves

a. Allotting coefficients
b. Dividing the numerator by denominator to get fractions
c. Dividing single fraction into parts
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Dividing single fraction into parts Explanation: No explanation is available for this question!

22)   The factors formed for partial fraction are a combination of

1) Linear factors
3) Square roots
4) Cube roots

a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 2 and 3 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 1 and 2 are correct Explanation: No explanation is available for this question!

23)   For a partial fraction method to be followed,

1) The degree of the numerator must be more than the degree of the denominator.
2) The factors formed for partial fraction are a combination of Linear factors and Irreducible quadratic factors.
3) The degree of the numerator must be less than the degree of the denominator.
4) The factors formed for partial fraction are a combination of Linear factors and Square roots.

a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 2 and 3 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 2 and 3 are correct Explanation: No explanation is available for this question!

24)   The partial fraction of x2+1/x(x-1)2 is

a. 1/ (x-1) + 2/(x-1)2 - 1/x
b. 1/ (x-1) + 2/(x-1)2 - 3/x
c. 1/ (x-1) + 2/(x-1)2 - 3/x2
d. 1/ (x+1) + 2/(x+1)2 - 1/x
 Answer  Explanation  Related Ques ANSWER: 1/ (x-1) + 2/(x-1)2 - 1/x Explanation: No explanation is available for this question!

25)   The impulse invariant method is obtained by

a. Sampling the impulse response of an equivalent analog filter
b. Taking backward difference for the derivative
c. Mapping from s-domain to z-domain
d. Approximation of derivatives
 Answer  Explanation  Related Ques ANSWER: Sampling the impulse response of an equivalent analog filter Explanation: No explanation is available for this question!

26)   The transformation technique in which there is one to one mapping from s-domain to z-domain is

a. Approximation of derivatives
b. Impulse invariance method
c. Bilinear transformation method
d. Backward difference for the derivative
 Answer  Explanation  Related Ques ANSWER: Bilinear transformation method Explanation: No explanation is available for this question!

27)   The frequency warping is referred as

1) lower frequencies in analog domain expanded in digital domain
2) lower frequencies in digital domain expanded in analog domain
3) non linear mapping
4) compression of higher frequencies

a. 1, 3 and 4 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 1, 3 and 4 are correct Explanation: No explanation is available for this question!

28)   The magnitude response of Butterworth filter has

1) Flat stop band
2) Flat pass band
3) Tapering pass band
4) Tapering stop band

a. 1 and 2 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct
 Answer  Explanation  Related Ques ANSWER: 1 and 2 are correct Explanation: No explanation is available for this question!

29)   In the cascaded form of realisation, the polynomials are factored into

a. a product of 1st-order and 2nd-order polynomials
b. a product of 2nd-order and 3rd-order polynomials
c. a sum of 1st-order and 2nd-order polynomials
d. a sum of 2nd-order and 3rd-order polynomials
 Answer  Explanation  Related Ques ANSWER: a product of 1st-order and 2nd-order polynomials Explanation: No explanation is available for this question!

30)   Parallel form of realisation is done in

a. High speed filtering applications
b. Low speed filtering applications
c. Both a and b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: High speed filtering applications Explanation: No explanation is available for this question!

31)   A partial-fraction expansion of the transfer function in Z-1 leads to

a. The parallel form II structure
b. The parallel form I structure
d. None of the above
 Answer  Explanation  Related Ques ANSWER: The parallel form I structure Explanation: No explanation is available for this question!

32)   A direct partial-fraction expansion of the transfer function in Z leads to

a. The parallel form II structure
b. The parallel form I structure
d. None of the above
 Answer  Explanation  Related Ques ANSWER: The parallel form II structure Explanation: No explanation is available for this question!

33)   Basically, group delay is the delayed response of filter as a function of ________.

a. Phase
b. Amplitude
c. Frequency
d. All of the above
 Answer  Explanation  Related Ques ANSWER: Frequency Explanation: No explanation is available for this question!

34)   A filter is said to be linear phase filter if the phase delay and group delay are _______

a. High
b. Moderate
c. Low
d. Constant
 Answer  Explanation  Related Ques ANSWER: Constant Explanation: No explanation is available for this question!

35)   Which among the following has/have a provision to support an adaptive filtering mechanism?

a. IIR
b. FIR
c. Both a and b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Both a and b Explanation: No explanation is available for this question!

36)   Which is/are the correct way/s for the result quantization of an arithmetic operation?

a. Result Truncation
b. Result Rounding
c. Both a and b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Both a and b Explanation: No explanation is available for this question!

37)   In direct form realization for an interpolator, which among the following generates an intermediate signal?

a. Upsampler
b. Downsampler
c. Anti-imaging filter
d. Anti-aliasing filter
 Answer  Explanation  Related Ques ANSWER: Upsampler Explanation: No explanation is available for this question!

38)   To change the sampling rate for better efficiency in two or multiple stages, The decimation and interpolation factors must be _________unity.

a. Less than
b. Equal to
c. Greater than
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Greater than Explanation: No explanation is available for this question!

39)   Which address/es is/are generated by Program Sequences?