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1991-07-06
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FCC Technician Exam Question Pool - Subelement 3AH
(Valid 7/1/90 thru 10/30/92)
SIGNALS AND EMISSIONS (2 Exam Questions)
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
3H-1.1 A
What is the meaning of the term MODULATION?
A. The process of varying some characteristic of a carrier
wave for the purpose of conveying information.
B. The process of recovering audio
information from a received signal.
C. The process of increasing the average power
of a Single Sideband transmission.
D. The process of suppressing the carrier
in a Single Sideband transmitter.
3H-2-1.1 A
If the modulator circuit of your FM transmitter fails, what
emission type would likely result?
A. An unmodulated carrier wave.
B. A phase modulated carrier wave.
C. An amplitude modulated carrier wave.
D. A frequency modulated carrier wave.
3H-2-1.2 B
What emission does not have sidebands resulting from modulation?
A. AM Phone.
B. Test.
C. FM Phone.
D. RTTY.
3H-2-2.1 C
What is the FCC emission designator for a Morse code telegraphy
signal produced by switching the transmitter output on and off?
A. Test.
B. AM phone.
C. CW.
D. RTTY.
3H-2-2.2
What is CW? A
A. Morse code telegraphy using amplitude modulation.
B. Morse code telegraphy using frequency modulation.
C. Morse code telegraphy using phase modulation.
D. Morse code telegraphy using pulse modulation.
3H-2-3.1 B
What is RTTY?
A. Amplitude-Keyed telegraphy.
B. Frequency Shift Keyed telegraphy.
C. Frequency Modulated telephony.
D. Phase Modulated telephony.
3H-2-3.2 A
What is the emission designation for Telegraphy by Frequency
Shift Keying without the use of a modulating tone?
A. RTTY.
B. MCW.
C. CW.
D. Single-sideband phone.
3H-2-4.1 B
What emission type results when an on/off keyed audio tone is
applied to the microphone input of an FM transmitter?
A. RTTY.
B. MCW.
C. CW
D. Single-sideband phone.
3H-2-4.2 D
What is tone-modulated international Morse code telegraphy?
A. Telephony produced by audio fed into an FM transmitter.
B. Telegraphy produced by an on/off keyed audio tone
fed into a CW transmitter.
C. Telegraphy produced by on/off keying of the carrier
amplitude.
D. Telegraphy produced by on/off keyed audio tone fed
into an FM transmitter.
3H-2-5.1 A
What is the emission designated as "MCW"?
A. Frequency-Modulated Telegraphy using audio tones.
B. Frequency-Modulated Telephony.
C. Frequency-Modulated Facsimile using audio tones.
D. Phase-Modulated Television.
3H-2-5.2 B
In an ITU emission designator like A1A, what does
the first symbol describe?
A. The nature of the signal modulating the main carrier.
B. The type of modulation of the main carrier.
C. The speed of a radiotelegraph transmission.
D. The type of the information to be transmitted.
3H-2-5.3 C
What emission type results when an on-off keyed audio oscillator
is connected to the microphone jack of an FM phone transmitter?
A. SS.
B. RTTY.
C. MCW.
D. Image.
3H-2-6.1 A
In an ITU emission designator like F3B, what does the
second symbol describe?
A. The nature of the signal modulating the main carrier.
B. The type of modulation of the main carrier.
C. The type of the information to be transmitted.
D. The frequency modulation index of a carrier.
3H-2-6.2 B
How would you transmit packet using an FM 2-meter transceiver?
A. Use your telegraph key to interrupt the carrier wave.
B. Modulate your FM transmitter with audio tones from a
terminal node controller.
C. Use your mike for telephony.
D. Use your touch-tone (DTMF) key pad to signal in Morse code.
3H-2-7.1 D
What type of emission results when speaking into the microphone
of a 2-meter FM hand-held transceiver?
A. Amplitude modulated phone.
B. Code telegraphy.
C. An unmodulated carrier wave.
D. Frequency modulated phone.
3H-2-7.2 B
What emission type do most 2-meter FM transmitters transmit?
A. Interrupted pure carrier wave.
B. Frequency modulated phone.
C. Single-sideband voice emissions.
D. Amplitude modulated carrier waves.
3H-2-8.1* C
What is the most important consideration when installing
a 10-meter dipole inside an attic?
A. It will exhibit a low angle of radiation?
B. The dipole must always be run horizontally polarized.
C. It will be covered by an insulation to prevent fire and high
enough to prevent being accidentally touched during transmission.
D. Dipoles usually don't work in attics.
* There is a problem with the answer (C) to question 3H2-8.1, as
released by the VEC Question Pool Committee. The most important
consideration is that an indoor antenna should be treated with
respect because of the possibility of adverse biological effects
due to near-field radiation. Another point to keep in mind is
that insulated wire does not reduce or eliminate the risk of
RF burns. Finally, a dipole does not pose a fire hazard from RF,
whether it uses insulated or uninsulated wire.
3H-2-8.2 D
Which type of transmitter will produce a frequency
modulated carrier wave?
A. A CW transmitter.
B. An amplitude modulation transmitter.
C. A single-sideband transmitter.
D. a phase modulated transmitter.
3H-3.1 A
What is the term used to describe a constant-amplitude
radio-frequency signal?
A. An RF carrier.
B. An AF carrier.
C. A sideband carrier.
D. A subcarrier.
3H-3.2 B
What is another name for an unmodulated radio-frequency signal?
A. An AF carrier.
B. An RF carrier.
C. A sideband carrier.
D. A subcarrier.
3H-4.1 C
What characteristic makes FM telephony especially well suited
for local VHF/UHF radio communications?
A. Good audio fidelity and intelligibility
under weak signal conditions.
C. Good audio fidelity and high signal-to-noise
ratio above a certain signal amplitude threshold.
B. Better rejection of multipath distortion than the AM modes.
D. Better carrier frequency stability than the AM modes.
3H-5.1 D
What emission is produced by a transmitter
using a reactance modulator?
A. CW
B. Un modulated carrier.
C. Single-sideband, suppressed-carrier phone.
D. Phase modulated phone.
3H-5.2 C
What other emission does phase modulation most resemble?
A. Amplitude Modulation.
B. Pulse Modulation.
C. Frequency Modulation.
D. Single-Sideband Modulation.
3H-6.1 D
Many communications receivers have several IF filters that can be
selected by the operator. Why do these filters have different widths?
A. Because some ham bands are wider than others.
B. Because different bandwidths help increase receiver sensitivity.
C. Because different bandwidths improve S-meter readings.
D. Because some emission types occupy a wider frequency range
than others.
3H-6.2 C
List the following signals in order of increasing bandwidth
(narrowest signal first): CW, FM voice, RTTY, SSB voice.
A. RTTY, CW, SSB voice, FM voice.
B. CW, FM voice, RTTY, SSB voice,
C. CW, RTTY, SSB voice, FM voice.
D. CW, SSB voice, RTTY, FM voice.
3H-7-1.1 D
To what is the deviation of an
FM transmission proportional?
A. Only the frequency of the audio modulating signal.
B. The frequency and the amplitude
of the audio modulating signal.
C. The duty cycle of the audio modulating signal.
D. Only the amplitude of the audio modulating signal.
3H-7-2.1 B
What is the result of overdeviation
in an FM transmitter?
A. Increased transmitter power consumption.
B. Out of channel emissions. (Splatter)
C. Increased transmitter range.
D. Inadequate carrier suppression.
3H-7-2.2 C
What is SPLATTER?
A. Interference to adjacent signals
caused by excessive transmitter keying speeds.
B. Interference to adjacent signals
caused by improper transmitter neutralization.
C. Interference to adjacent signals
caused by over modulation of a transmitter.
D. Interference to adjacent signals
caused by parasitic oscillations at the antenna.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *