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ELE3AG
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1992-01-26
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FCC TECHNICIAN Exam Question Pool. Subelement 3AG.
Practical Circuits. 1 Question.
---------------------------------------------------
3AG 1-1.1 A
Which frequencies are attenuated by a low-pass filter?
A. Those above its cut-off frequency
B. Those within its cut-off frequency
C. Those within 50 kHz on either side of its cut-off frequency
D. Those below its cut-off frequency
3AG 1-1.2 D
What circuit passes electrical energy below a certain frequency
and blocks electrical energy above that frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
3AG 1-2.1 C
Why does virtually every modern transmitter have a built-in
low-pass filter connected to its output?
A. To attenuate frequencies below its cutoff point
B. To attenuate low frequency interference to other amateurs
C. To attenuate excess harmonic radiation
D. To attenuate excess fundamental radiation
3AG 1-2.2 B
You believe that excess harmonic radiation from your transmitter
is causing interference to your television receiver. What is one
possible solution for this problem?
A. Install a low-pass filter on the television receiver
B. Install a low-pass filter at the transmitter output
C. Install a high-pass filter on the transmitter output
D. Install a band-pass filter on the television receiver
3AG 2-1.1 B
What circuit passes electrical energy above a certain frequency
and attenuates electrical energy below that frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
3AG 2-2.1 A
Where is the proper place to install a high-pass filter?
A. At the antenna terminals of a television receiver
B. Between a transmitter and a Transmatch
C. Between a Transmatch and the transmission line
D. On a transmitting antenna
3AG 2-2.2 B
Your Amateur Radio transmissions cause interference to your
television receiver even though you have installed a low-pass
filter at the transmitter output. What is one possible solution
for this problem?
A. Install a high-pass filter at the transmitter terminals
B. Install a high-pass filter at the television antenna terminals
C. Install a low-pass filter at the television antenna terminals
also
D. Install a band-pass filter at the television antenna terminals
3AG 3-1.1 A
What circuit attenuates electrical energy above a certain
frequency and below a lower frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
3AG 3-1.2 D
What general range of RF energy does a band-pass filter reject?
A. All frequencies above a specified frequency
B. All frequencies below a specified frequency
C. All frequencies above the upper limit of the band in question
D. All frequencies above a specified frequency and below a lower
specified frequency
3AG 3-2.1 A
The IF stage of a communications receiver uses a filter
with a peak response at the intermediate frequency. What
term describes this filter response?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
3AG 4-1.1 C
What circuit is likely to be found in all types of receivers?
A. An audio filter
B. A beat frequency oscillator
C. A detector
D. An RF amplifier
3AG 4-1.2 D
What type of transmitter does this block diagram represent?
┌───────┬─────────────────┬───────────────────┐ ANTENNA
│ │ │ │ ╙┬╜
│ ┌────┴────┐ ┌──────┴──────┐ ┌──────┴──────┐ │
│ │ VFO ├────>│ DRIVER ├────>│ POWER ├─>──┘
│ │ │ │ │ │ AMPLIFIER │
│ └─────────┘ └──────┬──────┘ └──────┬──────┘
│ │ │
│ ┌─────────┐ │ ┌─────────────┐ │
└──┤ POWER │ └──┤ TELEGRAPH ├──┘
│ SUPPLY │ │ KEY │
└─────────┘ └─────────────┘
A. A simple packet-radio transmitter
B. A simple crystal-controlled transmitter
C. A single-sideband transmitter
D. A VFO-controlled transmitter
3AG 4-1.3 B
What type of transmitter does this block diagram represent?
ANTENNA
╙┬╜
┌────────────┐ ┌─────────────┐ ┌─────────────┐ │
│ CRYSTAL ├────>│ DRIVER ├────>│ POWER ├─>──┘
│ OSCILLATOR │ │ │ │ AMPLIFIER │
└────────────┘ └──────┬──────┘ └──────┬──────┘
│ │
│ ┌─────────────┐ │
└──┤ TELEGRAPH ├──┘
│ KEY │
└─────────────┘
A. A simple packet-radio transmitter
B. A simple crystal-controlled transmitter
C. A single-sideband transmitter
D. A VFO-controlled transmitter
3AG 4-1.4 B
What is the unlabeled block (?) in this diagram?
ANTENNA
╙┬╜
│ ┌───────┐ ┌─────────┐ ┌───────┐ ┌─────────┐ ┌─┐/│
└──┤ MIXER ├──>│ IF ├──>│ ? ├──>│ AUDIO ├──>│ │ │
│ │ │AMPLIFIER│ │ │ │AMPLIFIER│ └─┘\│
└───┬───┘ └─────────┘ └───┬───┘ └─────────┘
┌──┴──┐ ┌──┴──┐
│ OSC │ │ BFO │
└─────┘ └─────┘
.
A. An AGC circuit
B. A detector
C. A power supply
D. A VFO circuit
3AG 4-1.5 D
What type of device does this block diagram represent?
┌───────┬─────────────────┬───────────────────┐ ANTENNA
│ │ │ │ ╙┬╜
│ ┌────┴────┐ ┌──────┴──────┐ ┌──────┴──────┐ │
│ │ VFO ├────>│ DRIVER ├────>│ POWER ├─>──┘
│ │ │ │ │ │ AMPLIFIER │
│ └─────────┘ └──────┬──────┘ └──────┬──────┘
│ │ │
│ ┌─────────┐ │ ┌─────────────┐ │
└──┤ POWER │ └──┤ TELEGRAPH ├──┘
│ SUPPLY │ │ KEY │
└─────────┘ └─────────────┘
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A simple superheterodyne receiver
D. A simple CW transmitter
3AG 4-2.1 D
What type of device does this block diagram represent?
╙┬╜ ANTENNA
│ ┌─────────┐ ┌─────┐ ┌──────┐ ┌─────────┐ ┌───────┐
└─>│ RF ├─>│MIXER├──>│ WIDE ├──>│ IF ├──>│LIMITER├─┐
│AMPLIFIER│ │ │ │FILTER│ │AMPLIFIER│ │ │ │
└─────────┘ └──┬──┘ └──────┘ └─────────┘ └───────┘ │
│ ┌─────────────<────────────────────┘
│ │ SPEAKER
┌──┴──┐ │ ┌─────────┐ ┌─────────┐ ┌─┐/│
│ OSC │ └─>│FREQUENCY├──>│ AUDIO ├──>│ │ │
│ │ │ DISC. │ │AMPLIFIER│ └─┘\│
└─────┘ └─────────┘ └─────────┘
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A simple superheterodyne receiver
D. A simple FM receiver
3AG 4-2.2 C
What is the unlabeled block (?) in this diagram?
│\ ┌─────────┐ ┌───────┐ ┌───────┐ ┌───────┐ ┌──────────┐
│ ├─┤ AUDIO ├──>│CLIPPER├─┐ │CRYSTAL├──>│ ? ├──>│MULTIPLIER├─┐
│/ │AMPLIFIER│ │FILTER │ │ │ OSC. │ │ │ │ │ │
MIC └─────────┘ └───────┘ │ └───────┘ └───┬───┘ └──────────┘ │
└─────>───────────┘ │
│
┌──────────────────────────────<──────────────────┘
│
│ ┌──────────┐ ┌──────────┐ ┌─────────┐ ╙┬╜
└─>│MULTIPLIER├──>│MULTIPLIER├──>│ POWER ├────┘
│ │ │ │ │AMPLIFIER│ ANTENNA
└──────────┘ └──────────┘ └─────────┘
A. A band-pass filter
B. A crystal oscillator
C. A reactance modulator
D. A rectifier modulator
--------------------------------------------------
End of Subelement 3AG.