Question 21 : Which of the following is the right way to reduce distortion in the DM?
1. By setting up an integrator in front of DM
2. By setting up an integrator behind the DM
3. By setting up an integrator in the middle of DM
4. None of the mentioned
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Question 22 : The noise power σ_n² can be reduced by increasing the sampling rate to spread the quantization noise power over a larger frequency band (-F_s/2,F_s/2).
1. True
2. False
3.
4.
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Question 23 : What is the relation defined by the operation of quantizer?
1. x_q(n) ≡ Q[x(n)]= x_k
2. x_q(n) = Q[x(n)]= x_k , if x(n) ∈ I_k
3. x_q(k) ≡ Q[x(k)]= x_k
4. None of the mentioned
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Question 24 : In the practical A/D converters, if the difference between the values at which the first transition and the last transition occur is not equal to FS - 2LSB, then such error is known as _________
1. Scale-factor error
2. Offset error
3. Linearity error
4. All of the mentioned
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Question 25 : In the equation x(t) = a(t)cos[2πF_ct+θ(t) ], Which of the following relations between a(t) and x(t), θ(t) and x(t) are true?
1. a(t), θ(t) are called the Phases of x(t)
2. a(t) is the Phase of x(t), θ(t) is called the Envelope of x(t)
3. a(t) is the Envelope of x(t), θ(t) is called the Phase of x(t)
4. None of the mentioned
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Question 26 : T he S/H is a digitally controlled analog circuit that tracks the analog input signal during the sample mode, and then holds it fixed during the hold mode to the instantaneous value of the signal at the time the system is switched from the sample to the hold mode.
1. True
2. False
3.
4.
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Question 27 : If the signal ẋ(t) can be viewed as the output of the filter with impulse response h(t) = 1/πt , -∞ < t < ∞ when excited by the input signal x(t) then such a filter is called as___
1. Analytic transformer
2. Hilbert transformer
3. Both Analytic & Hilbert transformer
4. None of the mentioned
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Question 28 : In the practical A/D converters, if the differences between transition values are not all equal or uniformly changing, then such error is known as ?
1. Scale-factor error
2. Offset error
3. Linearity error
4. All of the mentioned
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Question 29 : In DM, What is the order of predictor is used?
1. Zero-order predictor
2. Second-order predictor
3. First-order predictor
4. Third-order predictor
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Question 30 : What is the type of quantizer, if a Zero is assigned a decision level?
1. Midrise type
2. Mid tread type
3. Mistreat type
4. None of the mentioned
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