Digital Communication Set 7

Electrical Engineering

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This set of Digital Communication Multiple Choice Questions & Answers (MCQs) focuses on Digital Communication Set 7

Q1 | The non coherent FSK needs Eb/N0 than coherent FSK.
  • 1db more
  • 1db less
  • 3db more
  • 3db less
Answer: 1db more
Q2 | The DPSK needs Eb/N0 than BPSK.
  • 1db more
  • 1db less
  • 3db more
  • 3db less
Answer: 1db more
Q3 | Which is easier to implement and is preferred?
  • coherent system
  • non coherent system
  • coherent & non coherent system
  • none of the mentioned
Answer: non coherent system
Q4 | Which is the main system consideration?
  • probability of error
  • system complexity
  • random fading channel
  • all of the mentioned
Answer: all of the mentioned
Q5 | In the frequency of the carrier signal is varied based on the information in an a digital signal
  • ask
  • psk
  • fsk
  • qam
Answer: fsk
Q6 | In the amplitude of the carrier signal is varied based on the information in an a digital signal
  • ask
  • psk
  • fsk
  • qam
Answer: ask
Q7 | In modulation , the bit rate is 8 times the baud rate
  • 8-qam
  • 64-qam
  • 256-qam
  • none of above
Answer: 256-qam
Q8 | In modulation , the baud rate is 1/4 times the bit rate
  • 4-qam
  • 2-psk
  • 4-psk
  • none of above
Answer: none of above
Q9 | Which of the following is not a characteristic of PN sequence?
  • balance property
  • autocorrelation property
  • run property
  • non deterministic
Answer: non deterministic
Q10 |            symbols.
  • 2m
  • m
  • 2m
  • 2m-1
Answer: 2m-1
Q11 | PN sequence can be generated using .
  • sequential logic circuits
  • op-amp
  • timer ic
  • mosfet
Answer: sequential logic circuits
Q12 | DSSS system spreads the baseband signal by the baseband pulses with a pseudo noise sequence.
  • adding
  • subtracting
  • multiplying
  • dividing
Answer: multiplying
Q13 | Frequency hopping involves a periodic change of transmission                
  • signal
  • frequency
  • phase
  • amplitude
Answer: frequency
Q14 | What is the set of possible carrier frequencies in FH-SS?
  • hopset
  • hop
  • chips
  • symbols
Answer: hopset
Q15 | The bandwidth of the channel used in the hopset is called                    
  • hopping bandwidth
  • total hopping bandwidth
  • instantaneous bandwidth
  • 3 db bandwidth
Answer: instantaneous bandwidth
Q16 | The processing gain of FH systems is given by ratio of                
  • hopping bandwidth and hopping period
  • instantaneous bandwidth and hopping duration
  • 3 db bandwidth and bit rate
  • total hopping bandwidth and instantaneous bandwidth
Answer: total hopping bandwidth and instantaneous bandwidth
Q17 | Pseudorandom signal predicted.
  • can be
  • cannot be
  • maybe
  • none of the mentioned
Answer: can be
Q18 | In FH-SS which of the following Modulation Demodulation Technique has been used
  • bpsk
  • fsk
  • ask
  • qam
Answer: fsk
Q19 | In DS-SS which of the following Modulation Demodulation Technique has been used
  • bpsk
  • fsk
  • ask
  • qam
Answer: bpsk
Q20 | Frequency division multiple access (FDMA) assigns channels to users.
  • individual, individual
  • many, individual
  • individual, many
  • many, many
Answer: individual, individual
Q21 | The FDMA channel carries phone circuit at a time.
  • ten
  • two
  • one
  • several
Answer: one
Q22 | The bandwidth of FDMA channel is              
  • wide
  • narrow
  • large
  • zero
Answer: narrow
Q23 | The symbol time in FDMA systems is thus intersymbol interference is
  • large, high
  • small, low
  • small, high
  • large, low
Answer: large, low
Q24 | Due to transmission scheme bits are needed for overhead in FDMA systems.
  • continuous, few
  • discontinuous, few
  • continuous, many
  • discontinuous, many
Answer: continuous, few
Q25 |                      is based on FDMA/FDD.
  • gsm
  • w-cdma
  • cordless telephone
  • amps
Answer: amps
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