# Data Communication and Networking – Data Signals – Analog / Digital / Periodic / Aperiodic Signal MCQs A+ A  A-

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
16
. The frequency of a signal is inversely related to its _______
• 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