How many carrier frequencies are used in QPSK?

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How many carrier frequencies are used in QPSK?

1.2

2.1

3.0

4.None of the above

Posted Date:-2022-06-17 22:11:33

More MCQS Questions and answers

  1. A modem is connected in between a telephone line and a
  2. A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?
  3. A repeater takes a weakened or corrupted signal and ............... it.
  4. How many carrier frequencies are used in QPSK?
  5. If the baud rate for a 64-QAM signal is 2000, what is the bit rate?
  6. In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.
  7. In a synchronous modem, the digital-to-analog converter transmits signal to the
  8. Period is the inverse of
  9. Repeater operates in which layer of the OSI model
  10. Repeaters are often used on an 802.3 network to help strengthen the signals being transmitted. As with the length of segments and the number of segments, a limit exists as to how many repeaters can be used between any two nodes. What is the maximum number of repeaters that can be used?
  11. The _____ layer is the layer closest to the transmission medium.
  12. The black and white TV is an example of
  13. The constellation diagram of BPSK has ______ dots.
  14. This kind of data transmission allows data to be transmitted in both directions on a signal carrier at the same time.
  15. _____ conversion is the representation of analog information by an analog signal.
  16. ______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.
  17. ________ uses two carriers, one in-phase and the other quadrature.
  18. A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature).
  19. A devices that links two homogeneous packet-broadcast local networks, is
  20. A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as
  21. A modulator converts a _____ signal to a(n) _____ signal.
  22. A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?
  23. Analog-to-analog conversion is needed if the available bandwidth is _______.
  24. Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
  25. Demodulation is a process of
  26. Demodulation is the process of
  27. Devices on one network can communicate with devices on another network via a
  28. For connecting modem, a computer must be equipped with a port that conforms to the RS-232 standard of the Electronic Industries Association of America. What do the letters 'RS' stand for?
  29. Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?
  30. How many carrier frequencies are used in BASK?
  31. How many carrier frequencies are used in BFSK?
  32. If communication software can be called the "traffic cop" of a micro communication system, then what should the modem be called?
  33. If communication software can be called the "traffic cop" of a micro communication system, then what should the modem be called?
  34. If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?
  35. In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.
  36. In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.
  37. In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.
  38. In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.
  39. In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequenc
  40. Interconnected networks need communication processors such as switches, routers, hubs, and gateways. Select the best fit for answer:
  41. MAC address is also known as __________.
  42. Now-a-days computers all over the world can talk to each other. Which is one of the special accessories essential for this purpose?
  43. Propagation time is equals to
  44. Quadrature amplitude modulation (QAM) is a combination of ___________.
  45. Repeater function in the ...................... layer.
  46. RS-449/442-A/423-A is
  47. The cheapest modems can transmit
  48. The cheapest modems can transmit
  49. The constellation diagram of 16-QAM has ______ dots.
  50. The constellation diagram of BASK has ______ dots.
  51. The constellation diagram of QPSK has ______ dots.
  52. The Federal Communications Commission (FCC) allows ______ kHz for each FM station.
  53. The Federal Communications Commission (FCC) allows ______kHz for each AM station.
  54. The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are
  55. The level of the signal is inversely proportional to the
  56. The Nyquist formula gives us any signal level while Shannon capacity gives us the
  57. The physical layer, in reference to the OSI model, defines
  58. This kind of data transmission allows data to be transmitted in both directions on a signal carrier at the same time.
  59. What device separates a single network into two segments but lets the two segments appear as one to higher protocols?
  60. What is the difference between a switch and a hub?
  61. What is the main function of DSLAM?
  62. What is the name of the device that connects two computers by means of a telephone line?
  63. What is the name of the device that converts computer output into a form that can be transmitted over a telephone line?
  64. What is the use of Bridge in Network?
  65. Which of the following allows devices on one network to communicate with devices on another network?
  66. Which of the following connectivity devices is used to extend a network on a purely mechanical basis?
  67. Which of the following device copies electrical signals from one Ethernet to another?
  68. Which of the following device is used to connect two systems, especially if the systems use different protocols?
  69. Which of the following is not a digital-to-analog conversion?
  70. Which of the following is not an analog-to-analog conversion?
  71. Which of the following is not the possible ways of data exchange?
  72. Which of the following is used for modulation and demodulation?
  73. Which of the following layer decide the transmission rate in a Network?
  74. Which of the following statements is correct?
  75. Who invented the modem?
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