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Electronics and Communication Engineering - Signals and Systems

Exercise : Signals and Systems - Section 8
26.
Algebraic expression for z-transform of x[n] is X[z]... What is the algebraic expression of z-transform of ejω0n x[n]?
X(Z - Z0)
X(e-jW0z)
X(ejω0z)
X(Z)jω0z
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
The waveform shown in the given Figure can be written as
v(t) = u(t - 1) + u(t - 2) + u(t - 3) + u(t -4)
v(t) = u(t - 1) + u(t - 2) + u(t - 3) + u(t -4) - u(t - 5)
v(t) = u(t - 1) + u(t - 2) + u(t - 3) + u(t -4) - 4u(t - 5)
v(t) = u(t - 1) + u(t - 2) + u(t - 3) + u(t -4) + 4u(t - 5)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.

Assertion (A): The function δ'(t - b) is equal to 0 for t ≠ b

Reason (R): A number of impulses spaced from one another form an impulse train.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is true, R is false
A is false, R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
The range of values of a and b for which the linear time invariant system with impulse response.
h(n) = an n ≥ 0
        = bn n < 0
will be stable if
|a| > 1, |b| > 1
|a| < 1, |b| < 1
|a| < 1, |b| > 1
|a| > 1, |b| < 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
If f(- t) = f(t), the function f(t) has only cosine terms.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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