| 71. | A special band is assigned to Amplitude Modulation (AM) radio from |
| a. | 500 to 1700 kHz |
| b. | 530 to 1700 kHz |
| c. | 600 to 1500 kHz |
| d. | 200 to 2000kHz |
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Answer: (b).530 to 1700 kHz
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| 72. | Multilevel multiplexing is a technique used when the data rate of an input line is |
| a. | empty |
| b. | single |
| c. | multiple of others |
| d. | None |
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Answer: (c).multiple of others
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| 73. | DS-1 to DS-4 is implemented by |
| a. | T-0 to T-4 |
| b. | T-0 to T-3 |
| c. | T-1 to T-4 |
| d. | T-1 to T-3 |
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Answer: (c).T-1 to T-4
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| 74. | TDM is a digital multiplexing technique for combining several low-rate channels into |
| a. | a group of low-rate channels |
| b. | one high-rate one channel |
| c. | two high-rate channel |
| d. | None |
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Answer: (b).one high-rate one channel
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| 75. | In multiplexing process, the term 'link' refers to the |
| a. | media |
| b. | physical path. |
| c. | power lines |
| d. | information |
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Answer: (b).physical path.
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| 76. | Frequency-division multiplexing, wavelength-division multiplexing, are designed for |
| a. | digital signals |
| b. | analog signals |
| c. | both a and b |
| d. | None |
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Answer: (b).analog signals
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| 77. | DSSS technique expands the bandwidth of a signal by replacing each data bit with |
| a. | n+1 bits |
| b. | n-1 bits |
| c. | n bits |
| d. | both a and c |
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Answer: (c).n bits
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| 78. | Wavelength division multiplexing is same as |
| a. | FDM |
| b. | TDM |
| c. | DWDM |
| d. | None |
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Answer: (a).FDM
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| 79. | What is the minimum number of bits in a PN sequence if we use FHSS with a channel bandwidth of B =4 KHz and Bss =100 KHz |
| a. | 0 bits |
| b. | 5 bits |
| c. | 10 bits |
| d. | 15 bits |
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Answer: (b).5 bits
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| 80. | Each TV channel has its own bandwidth of |
| a. | 6Hz |
| b. | 6KHz |
| c. | 6MHz |
| d. | 6NHz |
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Answer: (c).6MHz
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