Electronics and Communication Engineering - Signals and Systems
Exercise : Signals and Systems - Section 4
- 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
21.
If 
otherwise find E(X)
otherwise find E(X)
0
Answer: Option
Explanation:
.
22.
The data of speed of train V and resistance to motion R is
The law R = a + bV2 is of the form
The law R = a + bV2 is of the form
Answer: Option
Explanation:
Use method of least squares.
23.
If 
then the sequence x[n] is
then the sequence x[n] isAnswer: Option
Explanation:
Therefore x[n] is not periodic.
24.
A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low pass filter with cut off frequency 800 Hz. The output signal has the frequency.
Answer: Option
Explanation:
Given fs = 1500 Hz ⇒ fm = 750 Hz.
The given signal frequency is 1 kHz.
The sampled frequency is 2.5 kHz, 0.5 kHz, But cut off frequency is 800 Hz or 0.8 kHz.
Therefore only 0.5 kHz will pass.
25.
If autocorrelation sequence is Rc(n) = 
then what will be energy of sequence?
then what will be energy of sequence?Answer: Option
Explanation:
In autocorrelation sequence max. energy lies at origin.
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