Pseudo-Noise Sequence and Jamming

Question 1
Marks : +2 | -2
Pass Ratio : 100%
For maximal length sequence, the sequence repetition clock pulses p is given by
2n + 1
2n -1
2n
None of the mentioned
Explanation:
For maximal length sequence, produced by n stage linear feedback shift register the sequence repetition clock pulses p is given by 2n -1 .
Question 2
Marks : +2 | -2
Pass Ratio : 100%
If the initial pulse of 1000 is fed to shift register, after how many clock pulses does the sequence repeat?
15
16
14
17
Explanation:
If the initial pulse 1000 is given to shift register, the foregoing sequence repeats after 15 clock pulses.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
For any cyclic shift, the auto-correlation function is equal to
1/p
-1/p
–p
p
Explanation:
For any cyclic shift the auto-correlation function is equal to -1/p.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The properties used for pseudorandom sequence are
Balance
Run
Correlation
All of the mentioned
Explanation:
The three basic properties that can be applied for pseudorandom sequence are balance, run and correlation properties.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which method is better?
To share same bandwidth
To share different bandwidth
To share same & different bandwidth
None of the mentioned
Explanation:
If the jammer noise shares the same bandwidth, the result could be destructive.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The shift register needs to be controlled by clock pulses.
True
False
Explanation:
The shift register operation is controlled by clock pulses.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
A linear feedback shift register consists of
Feedback path
Modulo 2 adder
Four stage register
All of the mentioned
Explanation:
A linear feedback shift register consists of four stage register for storage and shifting, modulo 2 adder and feedback path.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Pseudorandom signal ________ predicted.
Can be
Cannot be
maybe
None of the mentioned
Explanation:
Random signals cannot be predicted whereas pseudorandom sequence can be predicted.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Pulse jammer consists of
Pulse modulated excess band noise
Pulse modulated band-limited noise
Pulse width modulated excess band noise
Pulse width modulated band-limited noise
Explanation:
Pulse jammer consists of pulse modulated band-limited noise.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The sequences produced by shift register depends on
Number of stages
Feedback tap connections
Initial conditions
All of the mentioned
Explanation:
The sequences produced by shift register depends on the number of stages, the feedback tap connections and initial conditions.