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1 | |
Before data can be transmitted, they must be transformed to ________. |
|
| | A) | Electromagnetic signals |
| | B) | Periodic signals |
| | C) | Aperiodic signals |
| | D) | Low-frequency sine waves |
|
2 | |
When one of the components of a signal has a frequency of zero, the average amplitude of the signal ________. |
|
| | A) | Is less than zero |
| | B) | Is greater than zero |
| | C) | Is zero |
| | D) | (a) or (b) |
|
3 | |
A periodic signal can always be decomposed into ________. |
|
| | A) | Exactly an odd number of sine waves |
| | B) | A set of sine waves, one of which must have a phase of 0° |
| | C) | A set of sine waves |
| | D) | None of the above |
|
4 | |
A periodic signal completes one cycle in 0.001 s. What is the frequency? |
|
| | A) | 1 Hz |
| | B) | 100 Hz |
| | C) | 1 KHz |
| | D) | 1 MHz |
|
5 | |
In a frequency-domain plot, the horizontal axis measures the ________. |
|
| | A) | Frequency |
| | B) | Peak amplitude |
| | C) | Phase |
| | D) | Slope |
|
6 | |
In a time-domain plot, the vertical axis is a measure of ________. |
|
| | A) | Frequency |
| | B) | Phase |
| | C) | Amplitude |
| | D) | Time |
|
7 | |
In a time-domain plot, the horizontal axis is a measure of ________. |
|
| | A) | Signal amplitude |
| | B) | Time |
| | C) | Frequency |
| | D) | Phase |
|
8 | |
If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency? |
|
| | A) | 5 KHz |
| | B) | 10 KHz |
| | C) | 47 KHz |
| | D) | 57 KHz |
|
9 | |
What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz? |
|
| | A) | 3.96 MHz |
| | B) | 36 MHz |
| | C) | 360 KHz |
| | D) | 396 KHz |
|
10 | |
As frequency increases, the period ________. |
|
| | A) | Decreases |
| | B) | Increases |
| | C) | Remains the same |
| | D) | Doubles |
|
11 | |
When propagation speed is multiplied by propagation time, we get the ________. |
|
| | A) | Throughput |
| | B) | Wavelength of the signal |
| | C) | Distance a signal or bit has traveled |
| | D) | Distortion factor |
|
12 | |
Propagation time is ________ proportional to distance and ________ proportional to propagation speed. |
|
| | A) | Inversely; directly |
| | B) | Inversely; inversely |
| | C) | Directly; inversely |
| | D) | Directly; directly |
|
13 | |
Wavelength is ________ proportional to propagation speed and ________ proportional to period. |
|
| | A) | Directly; directly |
| | B) | Inversely; directly |
| | C) | Directly; inversely |
| | D) | Inversely; inversely |
|
14 | |
Which of the following can be determined from a frequency-domain graph of a signal? |
|
| | A) | Phase |
| | B) | Power |
| | C) | Frequency |
| | D) | All the above |
|
15 | |
Which of the following can be determined from a frequency-domain graph of a signal? |
|
| | A) | Phase |
| | B) | Bandwidth |
| | C) | Power |
| | D) | All the above |
|
16 | |
In a frequency-domain plot, the vertical axis measures the ________. |
|
| | A) | Frequency |
| | B) | Peak amplitude |
| | C) | Phase |
| | D) | Slope |
|
17 | |
Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A. |
|
| | A) | One-half |
| | B) | Twice |
| | C) | The same as |
| | D) | Indeterminate from |
|
18 | |
The wavelength of green light in air is ________ the wavelength of green light in fiber-optic cable. |
|
| | A) | Greater than |
| | B) | Less than |
| | C) | Equal to |
| | D) | None of the above |
|
19 | |
Using the Shannon formula to calculate the data rate for a given channel, if C = B, then ________. |
|
| | A) | The signal is equal to the noise |
| | B) | The signal is less than the noise |
| | C) | The signal is greater than the noise |
| | D) | Not enough information is given to answer the question |
|
20 | |
A sine wave is ________. |
|
| | A) | Aperiodic and continuous |
| | B) | Periodic and discrete |
| | C) | Aperiodic and discrete |
| | D) | Periodic and continuous |
|
21 | |
If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V. |
|
| | A) | 2 |
| | B) | 1 |
| | C) | -2 |
| | D) | Between -2 and 2 |
|
22 | |
A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________. |
|
| | A) | P2 is zero |
| | B) | P2 equals P1 |
| | C) | P2 is much larger than P1 |
| | D) | P2 is much smaller than P1 |
|
23 | |
________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. |
|
| | A) | Distortion |
| | B) | Noise |
| | C) | Decibel |
| | D) | Attenuation |
|
24 | |
________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal. |
|
| | A) | Attenuation |
| | B) | Noise |
| | C) | Distortion |
| | D) | Decibel |
|
25 | |
________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. |
|
| | A) | Attenuation |
| | B) | Noise |
| | C) | Distortion |
| | D) | Decibel |
|
26 | |
The ________ has units of meters/second or kilometers/second. |
|
| | A) | Throughput |
| | B) | Propagation time |
| | C) | Propagation speed |
| | D) | (b) or (c) |
|
27 | |
________ has units of bits/second. |
|
| | A) | Throughput |
| | B) | Propagation speed |
| | C) | Propagation time |
| | D) | (b) or (c) |
|
28 | |
The ________ has units of seconds. |
|
| | A) | Throughput |
| | B) | Propagation time |
| | C) | Propagation speed |
| | D) | (b) or (c) |
|
29 | |
The wavelength of a signal depends on the ________. |
|
| | A) | Frequencies of the signal |
| | B) | Medium |
| | C) | Phase of the signal |
| | D) | (a) and (b) |