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Mention the commonly used wireless media for data transmission.
Answer
- Antenna
- microwave
- radio wave
- infrared Consider a noiseless channel of 20 kHz and devices with the ability to emit and detect 8 distinct signal levels. What is the maximum data rate of this channel?
Answer
C=2Blog 2 L C=2201000*log 28 C= bps If a periodic signal is decomposed into five sine waves with frequencies of 50, 70, 90, 700, and 110 Hz assume all components have a maximum amplitude of 5 V.
- Calculate is its bandwidth
- Draw the spectrum, assuming all
Answer
1) Bandwidth=Fmax-Fmin
Bandwidth=700-50=650 Hz
Amplitude
50 70 90 110 700 Frequency (Hz) Using AMI plot the signal waveform , encode the binary information sequence (101111001000110) Answer AMI 1 =>UP/Down 0=>No Signal
A signal has passed through three cascaded amplifiers, each with a 4 dB gain. What is the total gain? How much is the signal amplified?
Answer
Total Gain=4dB+4dB+4dB=12dB
How much is the signal amplified?
Gaindb=10log 10 (Poutput/Pinput)
12=10log 10 (Poutput/Pinput)
12/1 0 =log 10 (Poutput/Pinput)
Poutput/Pinput=1 0 12/
The Correct Answer is: Frequency
The Correct Answer is: 3.96MHz
B=Fmax- Fmin
The Correct Answer is: Ground
The correct answer is: - 2 What is the difference between simplex and full-duplex transmission?
Answer (Book page 11,12)
The Correct Answer is: Peak amplitude
The Correct Answer is: Throughput
Answer
Bandwidth=5+5+5+5+5=25 KHz
C= bps
Calculate the maximum distance between two antennas for LOS transmission if one antenna is 100 m high and the other is at ground level.
Answer (Book Page : 67 )
Given
H 1 =100 m
K=4/
H 2 =
d=3.57√𝐾𝐻
d=3.57√
∗ 100 d= Km
The Correct Answer is: Frequency
The Correct Answer is: Coaxial
Answer
No.of. bits=8 bits
Time =8 us
On bit duration=1 us
Bit rate=1/bit duration=1/1us=1/10- 6 = 106 bps
Define the following Transmission Terminology:
- Attenuation,
- Full-duplex,
- bandwidth of a signal,
- spectrum of a signal
- Omnidirectional Antenna. Name three types of transmission impairment. Answer
- Attenuation
- Dispersion
- Delay Distortion
- Noise
Define Channel Capacity according to Shannon theory. Answer (Book page.3 5 ) Shannon capacity determine the theoretical data rate for noisy channel Capacity=B*log 2 (1+SNR) B=>Bandwidth SNR=>Signal to noise ratio SNR=Signal power/noise power
The correct answer is: 3960 KHz
Using NRZI plot of the signal waveform , encode the binary information sequence (101111001000110)
Select one: a. Parallel b. Asynchronous serial c. Synchronous serial d. (a) and (b)
The correct answer is: Parallel
Mention the commonly used guided media for data transmission.
Answer
- twisted pair cable
- coaxial cable
- optical fiber In _______ transmission, the channel capacity is shared by both communicating devices at all times. Select one: Simplex Half-Simplex Full-duplex
Half-duplex
The correct answer is: Full duplex
Answer
The correct answer is: Wireless waves can be classified as [radio ] waves, [microwaves] , or [infrared ] waves. We have a channel with 4 KHz bandwidth. If we want to send data at 100 Kbps, what is the minimum SNRdB? What is the SNR?
Answer
Slope Phase
The correct answer is: Peak amplitude
Using the Shannon formula to calculate the data rate for a given channel, if C = B, then ________. Select one: The signal is greater than the noise The signal is less than the noise The signal is equal to the noise Not enough information is given to the question
The correct answer is: The signal is equal to the noise
Which of the following can be determined from a frequency-domain graph of a signal? Select one: All the above Frequency Phase Power
The correct answer is: Frequency
If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency? Select one: 5 KHz 10 KHz 57 KHz 47 KHz
The correct answer is: 57KHz
