PREVIOUS YEAR SOLVED PAPERS - July 2016 Paper 3
- Option : D
- Explanation :
- Frequency Division Multiplexing is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted.Correct
- Wavelength Division Multiplexing (WDM) is an analog multiplexing Technique to combine optical signals.Correct
- WDM is a Digital Multiplexing Technique IncorrectIt is wavelength-division multiplexing
- TDM is a Digital Multiplexing Technique.Correct
So, option (D) is correct.
- Option : B
- Explanation : Throughput(S) in pure aloha is G * e-2G: It is maximum when G = 1 / 2. i.e. S = 1 / 2 * (2.71)-2 * 1 / 2 =1 / 2 * (2.71)-1 = 0.184. So, option (B) is correct.
| (a) Line coding | (i) A technique to change analog signal to digital data. |
| (b) Block coding | (ii) Provides synchronization without increasing number of bits. |
| (c) Scrambling | (iii) Process of converting digital data to digital signal. |
| (d) Pulse code modulation | (iv) Provides redundancy to ensure synchronization and inherits error detection. |
Codes:
| (a) | (b) | (c) | (d) | |
| (1) | (iv) | (iii) | (ii) | (i) |
| (2) | (iii) | (iv) | (ii) | (i) |
| (3) | (i) | (iii) | (ii) | (iv) |
| (4) | (ii) | (i) | (iv) | (iii) |
- Option : B
- Explanation :
- Line coding is a Process of converting digital data to digital signal.
- Block coding provides redundancy to ensure synchronization and inherits error detection.
- Scrambling provides synchronization without increasing number of bits.
- Pulse code modulation is a technique to change analog signal to digital data.
- Option : B
- Explanation : 100 pages , each page contain 24 line, each line have 80 character and each character weighted 8 bit, we have to download 100 pages per minute. i.e. 100 * 24 * 80 * 8 / 60 = 25.6 kbps. So, option (D) is correct.
| 3 | 5 | 2 | 1 | 4 | (Cipher text) |
| 1 | 2 | 3 | 4 | 5 | (Plain text) |
- Option : A
- Explanation : According to given question and key , Z is a bogus character Encrypted message will be:Plain text
Cipher textE X T R A N E T Z Z 1 2 3 4 5 1 2 3 4 5
So, option (A) is correct.T A X E R T Z E N Z 1 2 3 4 5 1 2 3 4 5
