Mixed Quiz
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Results Reporter
Out of 29 questions, you answered 8 correctly, for a final grade of
28%.
8 correct (28%)
21 incorrect (72%)
0 unanswered (0%)
0 ungraded (0%)
Your Results:
The correct answer for each question is indicated by a .
Before data can be transmitted, they must be
1 INCORRECT
transformed to ________.
A)Electromagnetic signals
B)Periodic signals
C)Aperiodic signals
D)Low-frequency sine waves
When one of the components of a signal has
2 INCORRECT 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)
A periodic signal can always be decomposed
3 INCORRECT
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
A periodic signal completes one cycle in 0.001
4 INCORRECT
s. What is the frequency?
A)1 Hz
B)100 Hz
C)1 KHz
D)1 MHz
In a frequency-domain plot, the horizontal
5 CORRECT
axis measures the ________.
A)Frequency
B)Peak amplitude
C)Phase
D)Slope
In a time-domain plot, the vertical axis is a
6 CORRECT
measure of ________.
A)Frequency
B)Phase
C)Amplitude
D)Time
In a time-domain plot, the horizontal axis is a
7 CORRECT
measure of ________.
A)Signal amplitude
B)Time
C)Frequency
D)Phase
If the bandwidth of a signal is 5 KHz and the
8 INCORRECT lowest frequency is 52 KHz, what is the
highest frequency?
A)5 KHz
B)10 KHz
C)47 KHz
D)57 KHz
What is the bandwidth of a signal that ranges
9 INCORRECT
from 40 KHz to 4 MHz?
A)3.96 MHz
B)36 MHz
C)360 KHz
D)396 KHz
10 INCORRECT As frequency increases, the period ________.
A)Decreases
B)Increases
C)Remains the same
D)Doubles
When propagation speed is multiplied by
11 INCORRECT
propagation time, we get the ________.
A)Throughput
B)Wavelength of the signal
C)Distance a signal or bit has
traveled
D)Distortion factor
Propagation time is ________ proportional to
12 INCORRECT distance and ________ proportional to
propagation speed.
A)Inversely; directly
B)Inversely; inversely
C)Directly; inversely
D)Directly; directly
Wavelength is ________ proportional to
13 CORRECT propagation speed and ________
proportional to period.
A)Directly; directly
B)Inversely; directly
C)Directly; inversely
D)Inversely; inversely
Which of the following can be determined
14 INCORRECT
from a frequency-domain graph of a signal?
A)Phase
B)Power
C)Frequency
D)All the above
Which of the following can be determined
15 INCORRECT
from a frequency-domain graph of a signal?
A)Phase
B)Bandwidth
C)Power
D)All the above
In a frequency-domain plot, the vertical axis
16 INCORRECT
measures the ________.
A)Frequency
B)Peak amplitude
C)Phase
D)Slope
Given two sine waves A and B, if the
17 CORRECT 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
The wavelength of green light in air is
18 CORRECT ________ the wavelength of green light in
fiber-optic cable.
A)Greater than
B)Less than
C)Equal to
D)None of the above
Using the Shannon formula to calculate the
19 INCORRECT 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
A sine wave is ________.
20 INCORRECT
A)Aperiodic and continuous
B)Periodic and discrete
C)Aperiodic and discrete
D)Periodic and continuous
If the maximum amplitude of a sine wave is 2
21 INCORRECT
V, the minimum amplitude is ________ V.
A)2
B)1
C)-2
D)Between -2 and 2
A signal is measured at two different points.
The power is P1 at the first point and P2 at
22 INCORRECT
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
________ is a type of transmission
impairment in which the signal loses strength
23 INCORRECT
due to the resistance of the transmission
medium.
A)Distortion
B)Noise
C)Decibel
D)Attenuation
________ is a type of transmission
impairment in which the signal loses strength
24 INCORRECT
due to the different propagation speeds of
each frequency that makes up the signal.
A)Attenuation
B)Noise
C)Distortion
D)Decibel
________ is a type of transmission
25 CORRECT impairment in which an outside source such
as crosstalk corrupts a signal.
A)Attenuation
B)Noise
C)Distortion
D)Decibel
The ________ has units of meters/second or
26 INCORRECT
kilometers/second.
A)Throughput
B)Propagation time
C)Propagation speed
D)(b) or (c)
________ has units of bits/second.
27 INCORRECT
A)Throughput
B)Propagation speed
C)Propagation time
D)(b) or (c)
28 CORRECT The ________ has units of seconds.
A)Throughput
B)Propagation time
C)Propagation speed
D)(b) or (c)
The wavelength of a signal depends on the
29 INCORRECT
________.
A)Frequencies of the signal
B)Medium
C)Phase of the signal
D)(a) and (b)
