True/False
Indicate whether the sentence or statement is true
or false.
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1.
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The
"envelope" of an AM signal resembles the modulating signal.
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2.
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Modulation is not a linear process.
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3.
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The
upper sideband contains the same information as the lower sideband.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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4.
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The
"envelope" of an AM signal is due to: a. | the baseband signal | c. | the amplitude signal | b. | the carrier
signal | d. | none of the
above | | | | |
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5.
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If
the audio Va sin(wat) modulates the carrier Vc
sin(wct), then the modulation index, m, is: a. | m =
wa / wc | c. | m = (Va /
Vc)2 | b. | m = Va /
Vc | d. | m =
Va / wa | | | | |
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6.
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Overmodulation causes: a. | distortion | c. | both a and b | b. | splatter | d. | none of the
above | | | | |
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7.
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The
peak voltage of an AM signal goes from Emax to Emin. The
modulation index, m, is: a. | m = Emin /
Emax | c. | m =
(Emax – Emin) / (Emax +
Emin) | b. | m = Emax /
Emin | d. | m =
(Emax + Emin) / (Emax –
Emin) | | | | |
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8.
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If a
5-kHz signal modulates a 1-MHz carrier, the bandwidth of the AM signal will be: a. | 5
kHz | c. | 1.005
MHz | b. | 10
kHz | d. | none of the
above | | | | |
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9.
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As
compared to plain AM, SSB AM: a. | is more efficient | b. | requires a more
complex demodulator circuit | c. | requires less bandwidth | d. | all of the
above | | |
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10.
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If an
SSB transmitter radiates 1000 watts at peak modulation, what will it radiate with no
modulation? a. | 1000
watts | c. | 250
watts | b. | 500 watts | d. | 0 watts | | | | |
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