Exercise: Signals And Systems

Questions for: Signals And Systems

In terms of signum function sgn(t), unit step function u(t) =
A:
1 + sgn(t)
B:
1 - sgn(t)
C:
0.5 + 0.5 sgn(t)
D:
0.5 - 0.5 sgn(t)
Answer: C
No answer description is available. Let's discuss.
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Which of following is recursive system?
A:
y(n - 1)
B:
y(n + 1)
C:
y(n)
D:
y(n) + y(n + 1)
Answer: A

In Recursive system, Present output depend upon past.

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An ac circuit has an impedance of (3 + j6) ohm for fundamental. The impedance for fifth harmonic is
A:
(15 + j 30) Ω
B:
(15 + j 6) Ω
C:
(3 + j 30) Ω
D:
(3 + j 1.2) Ω
Answer: C

R is independent of w and XL ∝ ω.

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Assertion (A): If , the final value of i(t) = 10

Reason (R): If , the initial value i(t) = 2

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is true, R is false
D:
A is false, R is true
Answer: D

Final value = 5. Hence A is wrong, initial value is 2. Hence R is correct.

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A voltage V(t) which is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt2 is measured by a true rms meter. The reading will be
A:
0
B:
4
C:
2
D:
16
Answer: C

Rms Uvalue =4.

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