Question 21 : If the Eigen function of an LTI system is x(n)= Aejnπ and the impulse response of the system is h(n)=(1/2)nu(n), then what is the Eigen value of the system?
1. 3/2
2. -3/2
3. -2/3
4. 2/3
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Question 22 : A comb filter is a special case of notch filter in which the nulls occur periodically across the frequency band.
1. True
2. False
3.
4.
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Question 23 : An IIR system with system function H(z)=(B(z))/(A(z)) is called a mixed phase if:
1. All poles and zeros are inside the unit circle
2. All zeros are outside the unit circle
3. All poles are outside the unit circle
4. Some, but not all of the zeros are outside the unit circle
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Question 24 : If X(ω) is the Fourier transform of the signal x(n), then what is the Fourier transform of the signal x(n-k)?
1. e^jωk. X(-ω)
2. e^jωk. X(ω)
3. e^-jωk. X(-ω)
4. e^-jωk. X(ω)
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