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# Quiz No 2 Data communication (CS601) Solution and Discussion Spring 2014 Due Date: June 04, 2014

Dear Students,

Quiz No. 2 of CS601 will be held on June 03, 2014 and will also remain open on June 04, 2014.

Lecture no. 11 to 20 will be included in the quiz.

You are required to attempt the quiz as early as possible once it is available to you.

Best of Luck! Regards,

Views: 5210

### Replies to This Discussion

Answer:

6. greater than
7. AMI
8. analog
9. B8ZS

(CS601) Quiz 2 | Date: June 3, 2014 | Time: 08:20 PM

1. Sampling means measuring ______________ of signal at equal intervals.

Frequencies
Phases
Bits

2. _________ of a signal is the collection of all the component frequencies it contains

Time domain
Frequency domain
Frequency spectrum
Time spectrum

3. By subtracting frequency from lowest to highest we get

frequency spectrum
bandwidth
minimum frequency

4. _______ can be measured by measuring the vertical distance from a given point on the wave form to the horizontal axis.

Phase
Amplitude
Frequency
Time

5. Radio is an example of _________________ signal conversion.

Analog to analog
Analog to digital
Digital to Digital
Digital to analog

6. There are ________ types of digital to digital encoding.

2
3
4
5

Answer:

1. amplitude
2. Frequency spectrum
3. bandwidth
4. Amplitude
5. Analog to analog
6. 3

10. A sine wave is ________.

periodic and discrete
aperiodic and discrete
periodic and continuous
aperiodic and continuous

11. In the encoding where positive to negative transition is one and vice versa is zero.

Manchester
Differential Manchester
All of above
None of given

12. _______encoding is almost obsolete today

Bipolar
Unipolar
Polar
Dual polar

13. _______ requires 2 signal changes to represent binary 0 but only one to represent binary 1.

NRZ-I
RZ
Manchester
Differential Manchester

Answer:

10. periodic and continuous
11. Manchester
12. Unipolar
13. Differential Manchester

thankssssss alot ahmad bhai

(CS601) Quiz 2 | Date: June 4, 2014 | Time: 10:30 AM

1. _____ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
Noise
Distortion
Desibles
Attenuation

2. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
5 KHz
47 KHz
57 KHz
10 KHz

3. Doubling no. of Tx lines ______ Cost and proves ___________
increase, uneconomical
increase, economical

4. Digital signals are refers to be
Continuous
Discrete
Aperiodic
Periodic

5. RZ stands for
Return to Z
Return 0

6. _______ data are continuous and take continuous values.
Digital
Analog
both analog and digital

7. The last process in PCM is _________ digital data into digital signal.
Modulating
Decoding
Encoding
Coding

Answer:

1. Attenuation
2. 57 KHz
3. increase, uneconomical
4. Discrete
5. Return 0
6. Encoding

RZ stand for,

Return to zero is correct.

6 not ecoding its analog

(CS601) Quiz 2 | Date: June, 4 2014 | Time: 11 : 20 AM

1. Analog To Analog Conversion Methods include ______.
AM, PM and FM
AM, FSK and PM
AM, PM and QAM
None of above

2. Asynchronous transmission is fast as compared to synchronous transmission.
false
true

3. A 1 bit is represented by positive to zero and a 0 is represented by negative to zero transition in ________ encoding.
NRZ-I
NRZ-L
RZ
Manchester

4. Bandwidth of AM signal (modulated signal) is equal to
2 * bandwidth of modulating signal
3 * bandwidth of modulating signal
4 * bandwidth of modulating signal

5. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

time; phase
frequency; time
time; frequency
phase, time

Ahmad reply ni ha

1

2

3

4

5

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