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WorksheetsQuiz Unit 1
Total questions: 55
Worksheet time: 41mins
Radar is an example of ........
full duplex
half duplex
Simplex
In (a) communication data is transmitted only in one direction
radio broadcast station use (a) to transmit information to the home listeners
In electromagnetic spectrum the frequency range from (a) is referred to as extremely low frequency range
The portion of electromagnetic spectrum occupied by a signal is called as (a)
Any unwanted signal that is associated with desired signal is known as (a)
The noise created outside the receiver is called as (a) noise
(a) is a noise whose power spectral density is uniform over the entire frequency range of interest
(a) is produced by the random movement of electrons or holes across a PN junction
(a) is used to express noise in the receiver
To convert electric wave back into sound wave .......... is used
earphone
microphone
The mouth piece of telephone converts the sound into an electrical symbol
true
false
Noise is always necessary along with desired noise
true
false
The frequency within the range 1 to 30 GHz are called microwave
true
false
Extra Terrestrial noise comes from source in space
true
false
Industrial noise is present between the frequencies of 1 to 600 MHz
true
false
Partition noise occurs due to random arrival of charge carriers
true
false
Noise figure is used to express noise in the receiver
true
false
The noise temperature is expressed in degree kelvin
true
false
The function of transmitter block is to convert the electrical equivalent of the information to a suitable form
True
False
Wired communication uses electromagnetic spectrum to communicate from one point to another
True
False
The visual information in the scene is converted to an electrical signal and then transmitted to home viewers
true
false
Noise is ....... signal
Predictable
Random
Unwanted
Necessary
The number of symbols transmitted per unit time is called (a)
The communication medium causes the signal to be
amplified
attenuated
modulated
detected
A cordless telephone is an example of
duplex arrangement
half duplex arrangement
Simplex arrangement
To convert electrical waves back to into sound waves (a) is used
(a) is just a number that indicates the relative strength of the signal to noise
Power transmission and Audio applications are typical application of
LF Band
VLF Band
HF Band
MF Band
Local Area network is an example of.........
Full Duplex
Half Duplex
Simplex
Frequency range 3-30GHz is associated with ...........
SHF
EHF
UHF
LF
Original information signal sent over the medium is called
analog
digital
broadband
baseband
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
(a) is defined as no of bits transmitted or sent in one second.
Voice Frequency range is..........
21Hz, 22KHz
30Hz, 31KHz
20Hz, 20kHz
Asynchronous transmission is faster than synchronous
true
false
Signal Bandwidth can be less than or greater to channel bandwidth.
True
False
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
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
