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WorksheetsIAT III MCQ : EC 8395 Communication Engineering
Total questions: 30
Worksheet time: 29mins
In digital communication system, smaller the code rate, _________are the redundant bits.
less
more
equal
unpredictable
According to Shannon's theorem, it is not feasible to transmit information over the channel with ______error probability, although by using any coding technique.
small
large
stable
unpredictable
In a linear code, the minimum Hamming distance between any two code words is ______minimum weight of any non-zero code word.
less than
greater than
equal to
None of the above
According to linearity property, the ________ of two code words in a cyclic code is also a valid code word.
sum
difference
product
division
In decoding of cyclic code, which among the following is also regarded as 'Syndrome Polynomial'?
Generator Polynomial
Received codeword Polynomial
Quotient Polynomial
Remainder Polynomial
For designing of (4,1) cyclic repetition code, what would be the order of the generator polynomial g(x)?
1
3
4
5
Which among the following represents the code in which codewords consists of message bits and parity bits separately?
Block codes
Systematic codes
code rate
Hamming distance
Which among the following is/are the essential condition/s for a good error control coding technique?
Faster coding & decoding methods
Better error correcting capability
Maximum transfer of information in bits/sec
All of the above
If the channel is bandlimited to 6 kHz & signal to noise ratio is 16, what would be the capacity of channel?
15.15 kbps
24.74 kbps
30.12 kbps
52.18 kbps
While representing the convolutional code by (n,k,m), what does 'm' signify or represent in it?
coded bits
message bits
memory order
all the above
During the shifting of bits in an encoder, how are the transitions in the states represented?
By lines
By circles
By squares
By summers
In Viterbi's algorithm, which metric is adopted for decision making?
Hamming distance
Hamming bound
Parity check
None
In Viterbi's algorithm, the selected paths are regarded as __________
survivors
destroyers
defenders
carriers
The channel capacity is
The maximum information transmitted by one symbol over the channel
Information contained in a signal
The amplitude of the modulated signal
All of the above
According to Shannon Hartley theorem,
The channel capacity becomes infinite with infinite bandwidth
The channel capacity does not become infinite with infinite bandwidth
Has a tradeoff between bandwidth and Signal to noise ratio
Both b and c are correct
Why spread spectrum technique is inefficient for a single user?
Large transmission bandwidth
Small transmission bandwidth
Fixed transmission bandwidth
Fixed null bandwidth
Which of the following is not a property of spread spectrum techniques?
Interference rejection capability
Multipath fading
Frequency planning elimination
Multiple user, multiple access interface
PN sequence can be generated using sequential logic circuits.
True
False
The period of a PN sequence produced by a linear m stage shift register cannot exceed _____ symbols.
2m
2^m
m
2^m - 1
DSSS system spreads the baseband signal by ________ the baseband pulses with a pseudo noise sequence.
Adding
Subtracting
Dividing
Multiplying
What is the set of possible carrier frequencies in FH-SS?
Chips
Hopset
Symbols
None
In fast frequency hopping, hopping rate is less than the information symbol rate.
True
False
Frequency division multiple access (FDMA) assigns ______ channels to _______ users.
Individual, individual
Many, individual
Individual, many
Many, many
The bandwidth of FDMA channel is ______
wide
Narrow
Large
Zero
__________ is based on FDMA/FDD.
Cordless telephone
GSM
AMPS
W-CDMA
__________ synchronization overhead is required in TDMA due to _______ transmission.
High, burst
High, continuous
Low, burst
No, burst
___________ of TDMA system is a measure of the percentage of transmitted data that contains information as opposed to providing overhead for the access scheme.
Mean
Efficiency
Figure of Merit
Signal to Noise ratio
___________ problem occurs when many mobile users share the same channel.
Near Far
Line of sight
Activation
Windowing
In CDMA, symbol duration is ___________ than channel delay spread.
Equal
Greater
Slightly greater
Much less
All users in CDMA system uses __________ carrier frequency.
Different
Two
Same
None
