| 101. | If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate? |
| a. | 300 |
| b. | 400 |
| c. | 1000 |
| d. | 1200 |
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|
Answer: (c).1000
|
| 102. | If the baud rate for a 64-QAM signal is 2000, what is the bit rate? |
| a. | 300 |
| b. | 400 |
| c. | 1000 |
| d. | 12000 |
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|
Answer: (d).12000
|
| 103. | 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? |
| a. | 700 KHz |
| b. | 705 KHz |
| c. | 710 KHz |
| d. | Cannot be determined from given information |
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|
Answer: (a).700 KHz
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| 104. | _______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data. |
| a. | Digital-to-analog |
| b. | Analog-to-analog |
| c. | Analog-to-digital |
| d. | Digital-to-digital |
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|
Answer: (a).Digital-to-analog
|
| 105. | Which of the following is not a digital-to-analog conversion? |
| a. | ASK |
| b. | PSK |
| c. | FSK |
| d. | AM |
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|
Answer: (d).AM
|
| 106. | In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant. |
| a. | ASK |
| b. | PSK |
| c. | FSK |
| d. | QAM |
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|
Answer: (a).ASK
|
| 107. | In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant. |
| a. | ASK |
| b. | PSK |
| c. | FSK |
| d. | QAM |
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|
Answer: (c).FSK
|
| 108. | In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. |
| a. | ASK |
| b. | PSK |
| c. | FSK |
| d. | QAM |
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|
Answer: (b).PSK
|
| 109. | A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature). |
| a. | amplitude and phase |
| b. | amplitude and frequency |
| c. | frequency and phase |
| d. | none of the above |
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Answer: (a).amplitude and phase
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| 110. | Quadrature amplitude modulation (QAM) is a combination of ___________. |
| a. | ASK and FSK |
| b. | ASK and PSK |
| c. | PSK and FSK |
| d. | none of the above |
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|
Answer: (b).ASK and PSK
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