Digital Signal Processing Test Questions - Set 2

1)   The IIR filter designing involves

a. Designing of analog filter in analog domain and transforming into digital domain
b. Designing of digital filter in analog domain and transforming into digital domain
c. Designing of analog filter in digital domain and transforming into analog domain
d. Designing of digital filter in digital domain and transforming into analog domain
Answer  Explanation 

ANSWER: Designing of digital filter in analog domain and transforming into digital domain

Explanation:
No explanation is available for this question!


2)   For a system function H(s) to be stable

a. The zeros lie in left half of the s plane
b. The zeros lie in right half of the s plane
c. The poles lie in left half of the s plane
d. The poles lie in right half of the s plane
Answer  Explanation 

ANSWER: The poles lie in left half of the s plane

Explanation:
No explanation is available for this question!


3)   IIR filter design by approximation of derivatives has the limitations

1) Used only for transforming analog high pass filters
2) Used for band pass filters having smaller resonant frequencies
3) Used only for transforming analog low pass filters
4) Used for band pass filters having high resonant frequencies


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 

ANSWER: 2 and 3 are correct

Explanation:
No explanation is available for this question!


4)   The filter that may not be realized by approximation of derivatives techniques are

1) Band pass filters
2) High pass filters
3) Low pass filters
4) Band reject filters


a. 1, 2 and 3 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct
Answer  Explanation 

ANSWER: 2 and 4 are correct

Explanation:
No explanation is available for this question!


5)   In direct form for realisation of IIR filters,

1) Denominator coefficients are the multipliers in the feed forward paths
2) Multipliers in the feedback paths are the positives of the denominator coefficients
3) Numerator coefficients are the multipliers in the feed forward paths
4) Multipliers in the feedback paths are the negatives of the denominator coefficients


a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 3 and 4 are correct
d. All the four are correct
Answer  Explanation 

ANSWER: 3 and 4 are correct

Explanation:
No explanation is available for this question!


6)   The direct form II for realisation involves

1) The realisation of transfer function into two parts
2) Realisation after fraction
3) Product of two transfer functions
4) Addition of two transfer functions


a. 1, 2 and 3 are correct
b. 1 and 3 are correct
c. 3 and 4 are correct
d. All the four are correct
Answer  Explanation 

ANSWER: 1 and 3 are correct

Explanation:
No explanation is available for this question!


7)   The cascade realisation of IIR systems involves

1) The transfer function broken into product of transfer functions
2) The transfer function divided into addition of transfer functions
3) Factoring the numerator and denominator polynomials
4) Derivatives of the transfer functions


a. 1, 2 and 3 are correct
b. 1 and 3 are correct
c. 3 and 4 are correct
d. All the four are correct
Answer  Explanation 

ANSWER: 1 and 3 are correct

Explanation:
No explanation is available for this question!


8)   The advantage of using the cascade form of realisation is

1) It has same number of poles and zeros as that of individual components
2) The number of poles is the product of poles of individual components
3) The number of zeros is the product of poles of individual components
4) Over all transfer function may be determined


a. 1, 2 and 3 are correct
b. 1 and 3 are correct
c. 1 and 4 are correct
d. All the four are correct
Answer  Explanation 

ANSWER: 1 and 4 are correct

Explanation:
No explanation is available for this question!


9)   Which among the following represent/s the characteristic/s of an ideal filter?

a. Constant gain in passband
b. Zero gain in stop band
c. Linear Phase Response
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


10)   FIR filters ________

A. are non-recursive
B. do not adopt any feedback
C. are recursive
D. use feedback


a. A & B
b. C & D
c. A & D
d. B & C
Answer  Explanation 

ANSWER: A & B

Explanation:
No explanation is available for this question!


11)   In tapped delay line filter, the tapped line is also known as ________

a. Pick-on node
b. Pick-off node
c. Pick-up node
d. Pick-down node
Answer  Explanation 

ANSWER: Pick-off node

Explanation:
No explanation is available for this question!


12)   How is the sensitivity of filter coefficient quantization for FIR filters?

a. Low
b. Moderate
c. High
d. Unpredictable
Answer  Explanation 

ANSWER: Low

Explanation:
No explanation is available for this question!


13)   Decimation is a process in which the sampling rate is __________.

a. enhanced
b. stable
c. reduced
d. unpredictable
Answer  Explanation 

ANSWER: reduced

Explanation:
No explanation is available for this question!


14)   Which units are generally involved in Multiply and Accumulate (MAC)?

a. Adder
b. Multiplier
c. Accumulator
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


15)   In DSP processors, which among the following maintains the track of addresses of input data as well as the coefficients stored in data and program memories?

a. Data Address Generators (DAGs)
b. Program sequences
c. Barrel Shifter
d. MAC
Answer  Explanation 

ANSWER: Data Address Generators (DAGs)

Explanation:
No explanation is available for this question!


16)   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 

ANSWER: Processor allows time sharing among a number of signals

Explanation:
No explanation is available for this question!


17)   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 

ANSWER: 1, 2 and 3 are correct

Explanation:
No explanation is available for this question!


18)   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 

ANSWER: The square root of the energy of the signal

Explanation:
No explanation is available for this question!


19)   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 

ANSWER: Linear combinations of N ortho normal basis functions, where N ≤ M.

Explanation:
No explanation is available for this question!


20)   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 

ANSWER: y[n] = x[n-k]

Explanation:
No explanation is available for this question!