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1 | |
Which encoding technique attempts to solve the loss of synchronization due to long strings of 0s? |
|
| | A) | NRZ |
| | B) | BnZS |
| | C) | AMI |
| | D) | (a) and (b) |
|
2 | |
Block coding can help in _______ at the receiver. |
|
| | A) | Synchronization |
| | B) | Error detection |
| | C) | Attenuation |
| | D) | (a) and (b) |
|
3 | |
In _______ transmission, bits are transmitted simultaneously, each across its own wire. |
|
| | A) | Parallel |
| | B) | Asynchronous serial |
| | C) | Synchronous serial |
| | D) | (a) and (b) |
|
4 | |
Unipolar, bipolar, and polar encoding are types of _______ encoding. |
|
| | A) | Block |
| | B) | Line |
| | C) | NRZ |
| | D) | Manchester |
|
5 | |
_______ encoding has a transition at the middle of each bit. |
|
| | A) | RZ |
| | B) | Manchester |
| | C) | Differential Manchester |
| | D) | All the above |
|
6 | |
_______ encoding has a transition at the beginning of each 0 bit. |
|
| | A) | Differential Manchester |
| | B) | RZ |
| | C) | Manchester |
| | D) | All the above |
|
7 | |
PCM is an example of _______ conversion. |
|
| | A) | Analog-to-analog |
| | B) | Analog-to-digital |
| | C) | Digital-to-digital |
| | D) | Digital-to-analog |
|
8 | |
If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem? |
|
| | A) | 500 samples/s |
| | B) | 1000 samples/s |
| | C) | 200 samples/s |
| | D) | 1200 samples/s |
|
9 | |
One factor in the accuracy of a reconstructed PCM signal is the _______. |
|
| | A) | Number of bits used for quantization |
| | B) | Signal bandwidth |
| | C) | Carrier frequency |
| | D) | Baud rate |
|
10 | |
In asynchronous transmission, the gap time between bytes is _______. |
|
| | A) | Fixed |
| | B) | A function of the data rate |
| | C) | Variable |
| | D) | Zero |
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11 | |
Synchronous transmission does not have _______. |
|
| | A) | A start bit |
| | B) | A stop bit |
| | C) | Gaps between bytes |
| | D) | All the above |
|
12 | |
Which encoding type always has a nonzero average amplitude? |
|
| | A) | Polar |
| | B) | Bipolar |
| | C) | Unipolar |
| | D) | All the above |
|
13 | |
Which of the following encoding methods does not provide for synchronization? |
|
| | A) | Manchester |
| | B) | NRZ-L |
| | C) | RZ |
| | D) | NRZ-I |
|
14 | |
Which encoding method uses alternating positive and negative values for 1s? |
|
| | A) | Manchester |
| | B) | AMI |
| | C) | NRZ-I |
| | D) | RZ |
|
15 | |
In PCM, an analog-to- _______ conversion occurs. |
|
| | A) | Analog |
| | B) | Digital |
| | C) | QAM |
| | D) | Differential |
|
16 | |
If the maximum value of a PCM signal is 31 and the minimum value is -31, how many bits were used for coding? |
|
| | A) | 4 |
| | B) | 5 |
| | C) | 6 |
| | D) | 7 |
|
17 | |
RZ encoding involves _______ signal levels. |
|
| | A) | Five |
| | B) | Four |
| | C) | Three |
| | D) | Two |
|
18 | |
Which quantization level results in a more faithful reproduction of the signal? |
|
| | A) | 2 |
| | B) | 8 |
| | C) | 16 |
| | D) | 32 |
|
19 | |
In _______ transmission, bits are transmitted over a single wire, one at a time. |
|
| | A) | Asynchronous serial |
| | B) | Synchronous serial |
| | C) | Parallel |
| | D) | (a) and (b) |
|
20 | |
In _______ transmission, a start bit and a stop bit frame a character byte. |
|
| | A) | Synchronous serial |
| | B) | Asynchronous serial |
| | C) | Parallel |
| | D) | (a) and (b) |
|
21 | |
If a symbol is composed of 3 bits, there are _______ data levels. |
|
| | A) | 2 |
| | B) | 4 |
| | C) | 8 |
| | D) | 16 |
|
22 | |
The Nyquist theorem specifies the minimum sampling rate to be_______. |
|
| | A) | Twice the bandwidth of a signal |
| | B) | Twice the highest frequency of a signal |
| | C) | Equal to the lowest frequency of a signal |
| | D) | Equal to the highest frequency of a signal |
|
23 | |
Pulse rate is always _______ the bit rate. |
|
| | A) | Less than |
| | B) | Less than or equal to |
| | C) | Greater than |
| | D) | Greater than or equal to |