This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data Signal – Analog Digital and Periodic Aperiodic”.
1. The _______ wave is the simplest analog signal.
- sine
- analog
- digital
- periodic
2. The sine wave is an example of _______ signal.
- an analog
- a digital
- a composite
- an aperiodic
3. A digital signal has a bit rate of 200 bps. The bit interval is _______ seconds
- 0.005
- 0.05
- 0.5
- 0.2
4. A digital signal has a bit rate of 50 Kbps. The bit interval is _______ microseconds
- 200
- 20
- 2
- 0.2
5. _______ signal repeats a pattern over and over again.
- A digital
- An analog
- A periodic
- An aperiodic
6. _______ signal has no repeating pattern.
- A digital
- An analog
- A periodic
- An aperiodic
7. The amplitude of a signal can be measured in _______
- volts
- amperes
- watts
- any of the above
8. On a time-domain plot, the _______ of a signal is the vertical value from a point on the curve to the x-axis
- amplitude
- period
- frequency
- phase
9. If the maximum value of a simple sine wave is 10 volts, the minimum value is _______ volts.
- 10
- 5
- the square root of 10
- - 10
10. If the maximum value of a simple sine wave is 10 volts, the voltage values _______.
- range from 0 to 10, inclusive
- are either 10 or -10
- range from -10 to 10, inclusive
- are integer values from -10 to 10
11. A simple sine wave completes one cycle in one microsecond. Its frequency is _______
- 1 MHz
- 1 æHz
- 1 Hz
- 1 THz
12. The period of a signal is usually expressed in _______
- Hz
- volts
- seconds
- radians
13. The frequency of a signal is usually expressed in _______
- Hz
- amperes
- seconds
- degrees
14. The _______ of a signal is usually expressed in Hz
- amplitude
- frequency
- phase
- voltage
15. The _______ of a signal is usually expressed in seconds.
- amplitude
- frequency
- period
- phase
- amplitude
- period
- phase
- any of the above
17. The _______ of a signal is its number of cycles per second.
- amplitude
- frequency
- phase
- any of the above
18. The _______ of a signal is the time it needs to complete one cycle.
- amplitude
- frequency
- phase
- period
19. The value of a simple sine wave at time zero is its maximum positive value. The phase shift is therefore _______ degrees.
- 0
- 90
- 180
- 270
20. The value of a simple sine wave at time zero is zero. The next value is negative. The phase shift is therefore _______ degrees.
- 0
- 90
- 180
- a or c
21. The value of a simple sine wave at time zero is zero. The next value is positive. The phase shift is therefore _______ degrees
- 0
- 90
- 180
- a or c
22. A nanosecond is _______ as long as a microsecond
- 0.1
- 0.01
- 0.001
- 0.0001
23. A picosecond is _______ as long as a nanosecond
- 0.1
- 0.01
- 0.001
- 0.0001
24. Ten thousand milliseconds equal _______.
- one second
- ten seconds
- 0.1 seconds
- 0.01 seconds
25. A signal with a frequency of 10 MHz has more cycles per second than a signal with a frequency of _______.
- 10 KHz
- 10 GHz
- 10 THz
- 1 THz
26. A signal with a period of 1 microsecond has a higher frequency than a signal with a period of _______
- one millisecond
- one nanosecond
- one picosecond
- none of the above
27. A signal with a period of 1 microsecond has a lower frequency than a signal with a period of _______
- one millisecond
- one picosecond
- one nanosecond
- b or c
28. The equivalent of 20 MHz is _______.
- 20 x 106 Hz
- 20 x 103 KHz
- 20 x 10-3 GHz
- all of the above
29. A signal with a frequency of 1 GHz has more cycles per second than a signal with a frequency of _______
- one THz
- two THz
- one MHz
- two GHz
30. A sine wave has a frequency of 10 Hz. Its period is _______
- 10 seconds
- 1 second
- 0.1 second
- 0.01 second
31. A sine wave completes one cycle in 20 seconds. Its frequency is _______
- 5 Hz
- 0.5 Hz
- 0.05 Hz
- 0.005 Hz
32. A signal has a constant value of 10 volts. Its frequency is _______ Hz.
- zero
- one
- ten
- five
33. A simple sine wave is offset one half cycle at time zero. This is a phase shift of _______ degrees
- 0
- 45
- 90
- 180
34. A simple sine wave completes one cycle in _______ degrees
- 45
- 90
- 180
- 360
35. A phase shift of 180 degrees is the same as a phase shift of _______ of a cycle
- one quarter
- one third
- one half
- three fourths
36. In a time-domain plot, signal amplitude is plotted against _______
- frequency
- period
- time
- phase
37. A time-domain plot shows signal _______ with respect to time.
- amplitude
- frequency
- cycle
- phase
38. In a frequency-domain plot, the signal amplitude of a simple sine wave is plotted against _______
- phase
- period
- frequency
- none of the above
39. In a frequency-domain plot of a composite signal consisting of twelve sine waves (all of different frequencies and amplitudes), there are _______ vertical bars
- 2
- 8
- 12
- 24
40. A signal with constant amplitude of ten volts has a frequency of _______
- 0
- 10
- 20
- indeterminate value
41. The _______ of a signal is the collection of all its component frequencies
- amplitude
- frequency spectrum
- phase
- bandwidth
42. The _______ of a signal is the width of its frequency spectrum
- bandwidth
- amplitude
- phase
- frequency
43. A signal is decomposed into two sine waves, one with a frequency of 10 Hz, the other with a frequency of 90 Hz. The bandwidth of the signal is _______ Hz
- 10
- 90
- 100
- 80
44. A signal is decomposed into three sine waves with frequencies of 10, 20, and 30 Hz. The bandwidth of the signal is _______ Hz
- 10
- 20
- 30
- 60
45. The bandwidth of a signal is 10 KHz. The frequency of the sine wave with the highest frequency is 11 KHz. The frequency of the sine wave with the lowest frequency is _______ Hz
- 1
- 10
- 11
- 21
46. The _______ is the time required to send one bit.
- bit interval
- bit rate
- baud
- frequency
47. The _______ is the number of bits sent in one second
- bit interval
- bit rate
- baud
- frequency
48. A bit interval of 0.1 seconds means a bit rate of _______bps
- 0.1
- 1
- 10
- 100
49. A bit interval of 10 milliseconds means a bit rate of _______bps.
- 0.1
- 1
- 10
- 100