# Analog vs Digital signals & Imparements

### Description

Data communication Quiz on Analog vs Digital signals & Imparements, created by ryo.iwata on 27/11/2013.
Quiz by ryo.iwata, updated more than 1 year ago
 Created by ryo.iwata about 10 years ago
62
0

## Resource summary

### Question 1

Question
The power we use at home has a frequency of 60Hz. The period of this sine wave can be written as follows:
• 16.6s
• 16.6ms
• Data not sufficient
• 0.0166us

### Question 2

Question
A periodic signal has a bandwidth of 20 Hz. The highest frequency is 60 Hz. What is the lowest frequency?
• 0 Hz
• 30 Hz
• 40 Hz
• 50 Hz

### Question 3

Question
The strength of signals falls off with distance over any transmisison.
• Attenuation
• Interference

### Question 4

Question
The course COMP 2140 introduces fundamental concepts related to the digital transmission and reception of information.
• True
• False

### Question 5

Question
Signals can be analog or digital. Analog signals can have an infinite number of values in a range; digital signals can have only a limited number of values.
• True
• False

### Question 6

Question
The values of SNR and SNR(dB) can be calculated as follows: SNR = (10,000uW / 1 mW) = 10,000 The value of SNR (dB) is 30 dB.
• True
• False

### Question 7

Question
Consider the noiseless channel transmitting a signal with four signal levels . The maximum bit rate can be calculated as:
• 12,000 Bps
• 12,000 kbps
• 1200 bps
• None of the above

### Question 8

Question
The loss in a cable is usually defined in decibels per kilometer (dB/km). If the signal at the beginning of a cable with −0.3 dB/km has a power of 2 mW, what is the power of the signal at 5 km in dB?
• +1.5 dB
• Loss of 1.5 dB
• - 1.5 dBm
• +3 dB

### Question 9

Question
For any transmission event, the received signal will consist of the transmitted signal modified by the various distortion imposed by the transmission system plus additional unwanted signals that are inserted somewhere between transmission or reception. The latter undesired signals are referred to as:
• Noise
• Interference

### Question 10

Question
There are three causes of impairments which are:
• Attentuation
• Distortion
• Repeater
• Noise

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