Question 21 : What are the values of z for which the value of X(z)=0?
1. Poles
2. Zeros
3. Solutions
4. None of the mentioned
View Answer   Discuss with Members

Question 22 : Which of the following method is used to find the inverse z-transform of a signal?
1. Counter integration
2. Expansion into a series of terms
3. Partial fraction expansion
4. All of the mentioned
View Answer   Discuss with Members

Question 23 : A linear time invariant system is characterized by the system function H(z)=1/(1-0.5z^-1 )+2/(1-3z^-1 ).What is the h(n) if the system is anti causal?
1. (0.5)ⁿu(n)+2(3)ⁿu(n)
2. (0.5)ⁿu(-n-1)-2(3)ⁿu(-n-1)
3. -[(0.5)ⁿ+2(3)ⁿ]u(-n-1)
4. (0.5)ⁿu(n)-2(3)ⁿu(-n-1)
View Answer   Discuss with Members

Question 24 : What is the DFT of the four point sequence x(n)={0,1,2,3}?
1. {6,-2+2j-2,-2-2j}
2. {6,-2-2j,2,-2+2j}
3. {6,-2+2j,-2,-2-2j}
4. {6,-2-2j,-2,-2+2j}
View Answer   Discuss with Members

Question 25 : What is the unit step response of the system described by the difference equation
y(n)=0.9y(n-1)-0.81y(n-2)+x(n) under the initial conditions y(-1)=y(-2)=0?
1. [1.099+1.088(0.9)ⁿ.cos(πn/3+5.2^o)]u(n)
2. [1.099+1.088(0.9)ⁿ.cos(πn/3-5.2^o)]u(n)
3. [1.099+1.088(0.9)ⁿ.cos(πn/3-5.2^o)].
4. None of the mentioned
View Answer   Discuss with Members

Question 26 : For what kind of signals one sided z-transform is unique?
1. All signals
2. Anti-causal signal
3. Causal signal
4. None of the mentioned
View Answer   Discuss with Members

Question 27 : If p_k, k=1,2,…N are the poles of the system and |p_k| < 1 for all k, then the natural response of such a system is called as Transient response.
1. True
2. False
3.
4.
View Answer   Discuss with Members

Question 28 : If all the poles of H(z) are inside the unit circle, then the system is said to be:
1. Only causal
2. Only BIBO stable
3. BIBO stable and causal
4. None of the mentioned
View Answer   Discuss with Members

Question 29 : What is the one sided z-transform X⁺(z) of the signal x(n)={1,2,5,7,0,1}?
1. z²+2z+5+7z^-1+z^-3
2. 5+7z+z³
3. z^-2+2z^-1+5+7z+z³
4. 5+7z^-1+z^-3
View Answer   Discuss with Members

Question 30 : The z-transform X(z) of the signal x(n)=anu(n) has:
1. One pole at z=0 and one zero at z=a
2. One pole at z=0 and one zero at z=0
3. One pole at z=a and one zero at z=a
4. One pole at z=a and one zero at z=0
View Answer   Discuss with Members