Electronics and Communication Engineering - Signals and Systems
Exercise : Signals and Systems - Section 2
- Signals and Systems - Section 1
- Signals and Systems - Section 2
- Signals and Systems - Section 3
- Signals and Systems - Section 4
- Signals and Systems - Section 5
- Signals and Systems - Section 6
- Signals and Systems - Section 7
- Signals and Systems - Section 8
- Signals and Systems - Section 9
- Signals and Systems - Section 10
1.
If f=0
Answer: Option
Explanation:
.
2.
An ac circuit has an impedance of (2 - j 9) Ω for third harmonic. The impedance for fundamental is
6 - j 27 Ω
2 - j 27 Ω
2 - j 3 Ω
Answer: Option
Explanation:
.
3.
The ROC of sequence x[n] = (0.8)n ∪[n] + (0.4)n ∪[n]
Answer: Option
Explanation:
ROC ⇒ 1 - 0.8 z-1 < 0 1 - 0.4 z-1
⇒ 1 > 0.8 z-1 ⇒ z > 0.4
or z > 0.8
By combining both condition
ROC because z > 0.4
If you consider z > 0.8 then ROC between the limit 0 to 0.4 excluded.
4.
Pick the odd one
Answer: Option
Explanation:
Because Variance, standard Deviation, Expectation are related to each other.
5.
The sampling of a function f(l) = sin 2pf0t starts from a zero crossing. The signal can be detected if sampling time T is
Answer: Option
Explanation:
Because fs ≤ 2f0, Ts ≤ 
.
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