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WorksheetsIntroduction to electronics communication
Total questions: 35
Worksheet time: 27mins
Radar is an example of ........
full duplex
half duplex
Simplex
(a) is defined as the portion of the electromagnetic spectrum occupied by the signal.
Noise is ....... signal
Predictable
Random
Unwanted
Necessary
The number of symbols transmitted per unit time is called (a)
Power transmission and Audio applications are typical application of
LF Band
VLF Band
HF Band
MF Band
The communication medium causes the signal to be
amplified
attenuated
modulated
detected
Local Area network is an example of.........
Full Duplex
Half Duplex
Simplex
Frequency range 3-30GHz is associated with ...........
SHF
EHF
UHF
LF
Sonar is an example of .........
full duplex
half duplex
Simplex
Original information signal sent over the medium is called
analog
digital
broadband
baseband
Voice Frequency range is..........
21Hz, 22KHz
30Hz, 31KHz
20Hz, 20kHz
The process of superimpossing a baseband signal over a high frequency carrier signal is
demodulation
modulation
detection
Telephony communication system is a type of
Half duplex
Full duplex
Simplex
All of the above
Asynchronous transmission is faster than synchronous
true
false
Pager is a type of .......
Full Duplex
Half Duplex
Simplex
Signal Bandwidth can be less than or greater to channel bandwidth.
True
False
Which of the following uses simplex transmission
CB radio
teleconferencing
telephone system
cable television
Hartley’s Law states that
C α B× t
Ts = 1/ Fs
Ts = 1/2Fm
A hamming code can
detect a single bit error
correct a single bit error
detect correct a single bit error
none of the above
Channel Capacity is directly proportional to ......... and ...........
bandwidth
transmission time
SNR
Frequency
Channel Capacity of a noise free channel having N symbol is given by
log N
N
2^N
In asynchronous transmission ....... and ......... are used to signal the beginning and end of a character
space and mark bits
start and stop bits
odd parity and even parity bits
The sampled signal is discrete in time and continuous in amplitude. State true or false
True
False
In simplex system there is return path for the receiver to automatically request re transmission in the event of an error.
true
false
If information is analog it is converted to discrete form by using a method called (a)
CRC generator is an algebraic (a) represented as a bit pattern.
Channel Capacity formula is given as .........
C=2 B log2N
Fs= 2 Fm
(Vs2/R)/(Vn2/R)=Vs/Vn
To express the noise quality of the receiver noise figure is used. state true or false
true
false
Duplex system use ARQ method since it is more reliable.
True
False
Shannon’s theorem is not a constructive proof . Is it a true or false statement
True
False
In FEC small amount of controlled redundancy is added to a message to allow the receiver to detect if an error is detected, the user can either ignore the message or request a source to reset the message.
true
false
(a) is defined as no of bits transmitted or sent in one second.
In hamming code the parity bits are inserted at each 2n Bit where n=1,2,4,6.....
true
false
To reduce effects of noise especially in data communication channel coding is used.
True
False
Techniques using modulation are know as broadband.
true
false
