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Gibilisco - Wireless Transmitters And Receivers
20 Questions
|
By BATANGMAGALING | Updated: Mar 21, 2022
| Attempts: 122
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1.
In which mode of PM does the peak power level of the pulses vary?
PAM
PDM
PIM
PFM
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About This Quiz
2.
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We’ll put your name on your report, certificate, and leaderboard.
What grade are you in?
Grade 12
Grade 11
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Grade 8
Grade 7
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Grade 3
Grade 2
Grade 1
Kindergarten (K)
2.
Which of the following modes is used to send image data over telephone lines?
On/off keying
Fax
AM
Product detection
Submit
3.
The highest layer of the ionosphere is
The D layer.
The E layer.
The F layer.
None of the above.
Submit
4.
Which of the following modes can be demodulated with an envelope detector?
AM
CW
FSK
USB
Submit
5.
The bandwidth of a fax signal is kept narrow by
Sending the data at a slow rate of speed.
Maximizing the number of digital states.
Optimizing the range of colors sent.
Using pulse modulation.
Submit
6.
The S/N ratio is a measure of
The sensitivity of a receiver.
The selectivity of a receiver.
The dynamic range of a receiver.
The efficiency of a transmitter.
Submit
7.
A receiver that responds to a desired signal, but not to another signal very close by in
frequency, has good
Sensitivity.
Noise figure.
Dynamic range.
Selectivity.
Submit
8.
Frequency sweeping can be used to get a transmitter to produce
Spread-spectrum signals.
Time division multiplexed signals.
Narrowband AM signals.
Double sideband, suppressed carrier signals.
Submit
9.
If an AM signal is modulated with audio having frequencies up to 5 kHz, then what is the
complete signal bandwidth?
10 kHz
20 kHz
50 kHz
500 kHz
Submit
10.
Suppose an SSB suppressed carrier is at 14.335 MHz, and audio data is contained in a band
from 14.335 to 14.338 MHz. What is this mode?
DSB
LSB
USB
AFSK
Submit
11.
A continuously variable signal (such as music audio) can be recovered from a signal having
only a few discrete levels or states by means of
A ratio detector.
A D/A converter.
A product detector.
An envelope detector.
Submit
12.
Fill in the blank to make the following sentence true: “The reception of can be
improved by the use of DSP.”
SSB signals
SSTV signals
Synchronized communications signals
Any of the above
Submit
13.
The reflected wave
Arrives in phase with the direct wave.
Arrives out of phase with the direct wave.
Arrives in a variable phase compared with the direct wave.
Is always horizontally polarized.
Submit
14.
Fill in the blank in the following sentence to make it true: “The deviation of a narrowband
voice FM signal normally extends up to either side of the unmodulated-carrier frequency.”
3 kHz
5 kHz
10 kHz
3 MHz
Submit
15.
A radio wave has a frequency of 1.55 MHz. The highest modulating frequency that can be
used effectively is about
1.55 kHz.
15.5 kHz.
155 kHz.
1.55 MHz.
Submit
16.
The dynamic range in a superhet is largely influenced by the performance of the
Local oscillator.
Product detector.
Front end.
Selectivity in the IF chain.
Submit
17.
An advantage of FSK over on/off keying is the fact that FSK
Offers better frequency stability.
Can provide faster data rates.
Reduces the number of receiving errors.
Forget it! On-off keying is just as good as FSK.
Submit
18.
In which mode are signals intertwined in the time domain at the transmitter, and then
separated again at the receiver?
FDM
AFSK
PCM
None of the above
Submit
19.
An FM detector with built-in limiting is
A ratio detector.
A discriminator.
An envelope detector.
A product detector.
Submit
20.
An LSB, suppressed-carrier signal can be demodulated by
An envelope detector.
A diode.
A ratio detector.
A product detector.
Submit
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In which mode of PM does the peak power level of the pulses vary?
Which of the following modes is used to send image data over telephone...
The highest layer of the ionosphere is
Which of the following modes can be demodulated with an envelope...
The bandwidth of a fax signal is kept narrow by
The S/N ratio is a measure of
A receiver that responds to a desired signal, but not to another...
Frequency sweeping can be used to get a transmitter to produce
If an AM signal is modulated with audio having frequencies up to 5...
Suppose an SSB suppressed carrier is at 14.335 MHz, and audio data is...
A continuously variable signal (such as music audio) can be recovered...
Fill in the blank to make the following sentence true: “The...
The reflected wave
Fill in the blank in the following sentence to make it true: “The...
A radio wave has a frequency of 1.55 MHz. The highest modulating...
The dynamic range in a superhet is largely influenced by the...
An advantage of FSK over on/off keying is the fact that FSK
In which mode are signals intertwined in the time domain at the...
An FM detector with built-in limiting is
An LSB, suppressed-carrier signal can be demodulated by
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