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WorksheetsQuiz 1: Basics of Wireless Communication
Total questions: 20
Worksheet time: 10mins
The RF channel in a radio transmitter produces
High frequency carrier waves
Both audio signal and high frequency carrier waves
Low frequency carrier waves
Audio signals
In a communications system, noise is most likely to affect the signal
at the transmitter
in the channel
in the information source
at the destination
Indicate the false statement. Modulation is used to
reduce the bandwidth used
separate differing transmissions
ensure that intelligence may be transmitted over long distances
allow the use of practicable antennas
Indicate the false statement. From the transmitter the signal deterioration because of noise is usually
unwanted energy
predictable in character
present in the transmitter
due to any cause
Amplitude modulation is the process of
superimposing a low frequency on a high frequency
superimposing a high frequency on a low frequency
carrier interruption
frequency shift and phase shift
The baud rate
is always equal to the bit transfer rate
is equal to twice the bandwidth of an ideal channel
is not equal to the signaling rate
is equal to one-half the bandwidth of an ideal channel
A forward error-correcting code corrects errors by
requiring partial retransmission of the signal
requiring retransmission of the entire signal
requiring no part of the signal to be retransmitted
using parity to correct the errors in all cases
Full duplex operation
requires two pairs of cables
can transfer data in both directions at once
requires modems at both ends of the circuit
all of the above
The data transmission rate of a modem is measured in
bytes per second
baud rate
bits per second
megahertz
Which of the steps is not included in the process of reception?
decoding
encoding
storage
interpretation
Which of the following is NOT an example of a full-duplex system
4G, LTE cellular Radio
DECT Cordless phone
Handheld Intercom Radio Set
IS-95 Cellular Radio
Which of the following helps to combat noise in digital communication system?
source coding
convolutional codes
baseband filtering
encryption
Which of the following statements is FALSE regarding QoS issues in Wireless Communication System.
In a wireless network, reliability can be improved by improving the reliability of the individual components.
In a wireless system, reliability can be improved by reducing the number of paths between the source and the destination.
In a wireless system, reliability ca be improved by reducing the number of intermediate links between the source and the destination.
In a wireless system, reliability can be improved by increasing the stability and mean time to failure of the components of the communication link.
Which of the following statements regarding TDMA is FALSE?
TDMA divides the spectrum into many frequency slots for the individual users to access.
2 or more channel of information are transmitted over the same link by allocating different time slots.
TDMA allocates time slot of equal duration to all users.
Users in TDMA system has to break up the information they wanted to send into parcels and take turns to send the parcel of information over from the transmitter to the receiver.
The carrier frequency is usually lower than the modulating frequency.
TRUE
FALSE
The electromagnetic spectrum is managed worldwide by the_____ organization.
FCC
ITU
NTC
NTIA
The regulatory body for electronic communications in the United States is the _____.
NTC
ITU
NTIA
FCC
Two-way communications where each party takes turns transmitting is referred to as_____
Half Duplex
Full Duplex
Simplex
Multiplexing
The process of transmitting two or more baseband signals simultaneously over a common medium is called _____
Multiplexing
Demodulation
Modulation
Talking
Which of the following is not considered as one of the basic elements of communication system?
Transmitter
Receiver
Noise
Medium
