Q. Chips are the
✅ Correct Answer: (A)
repeated symbols
Explanation: the repeated symbols are called as chips.
Communication Engineering MCQs | Page - 4
Dear candidates you will find MCQ questions of Communication Engineering here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. Slow frequency hopping is
✅ Correct Answer: (B)
several modulations per hop
Explanation: slow frequency hopping is several modulation per frequency hop.
Q. Fast frequency hopping is
✅ Correct Answer: (D)
none of the mentioned
Explanation: fast frequency hopping is several frequency hops per modulation.
Q. Which duration is shorter?
✅ Correct Answer: (A)
hop duration
Explanation: in frequency hopping technique hop duration is shorter than the symbol duration.
Q. Frequency division multiple access (FDMA) assigns channels to users.
✅ Correct Answer: (A)
individual, individual
Explanation: frequency division multiple access (fdma) assigns individual channels to individual users. each user is allocated a unique frequency band or channel. these channels are assigned on demand to users who request service.
Q. If the FDMA channel is not in use, it can be used by other users.
✅ Correct Answer: (B)
false
Explanation: if an fdma channel is not in use, it sits idle and cannot be used by other users to increase or share capacity. it is essentially a wasted resource.
Q. The bandwidth of FDMA channel is
✅ Correct Answer: (B)
narrow
Explanation: the bandwidth of fdma channels is relatively narrow as each channel supports only one circuit per carrier. that is, fdma is usually implemented in narrow band systems.
Q. Which of the following is not true for FDMA systems as compared to TDMA systems?
✅ Correct Answer: (B)
lower cell site system cost
Explanation: fdma systems have higher cell site system costs as compared to tdma systems. it is due to single channel per carrier design, and the need to use costly bandpass filters to eliminate spurious radiation at the base station.
Q. is undesired RF radiation.
✅ Correct Answer: (A)
intermodulation frequency
Explanation: intermodulation (im) frequency is undesired rf radiation which can interfere with other channels in the fdma systems. the nonlinearities cause signal spreading in the frequency domain and generate im frequency.
Q. is based on FDMA/FDD.
✅ Correct Answer: (D)
amps
Explanation: the first us analog cellular system, the advanced mobile phone system (amps) is based on fdma/fdd. a single user occupies a single channel while the call is in progress.
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