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Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO
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1991-06-30
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FCC Technician Exam Question Pool - Subelement 3AC.
(Valid 7/1/90 thru 10/31/92)
RADIO WAVE PROPAGATION (3 Exam Questions)
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3C-1-1.1 A
What is the IONOSPHERE?
A. That part of the upper atmosphere where enough ions and
free electrons exist to affect radio wave propagation.
B. The boundary between two air masses of different temperature
and humidity, along which radio waves can travel.
C. The ball that goes on the top of a mobile whip antenna.
D. That part of the atmosphere where weather takes place.
3C-1-1.2 D
What is the region of the outer atmosphere that
makes long distance radio communications possible
as a result of bending of radio waves?
A. Troposphere.
B. Stratosphere.
C. Magnetosphere.
D. Ionosphere.
3C-1-1.3 C
What type of solar radiation is most responsible for
ionization in the outer atmosphere?
A. Thermal.
B. Ionized particle.
C. Ultraviolet.
D. Microwave.
3C-1-2.1 A
Which Ionospheric layer limits daytime radio communications
in the 80 meter wavelength band to short distances?
A. D layer.
B. F1 layer.
C. E layer.
D. F2 layer.
3C-1-2.2 B
What is the lowest Ionospheric layer?
A. The A layer.
B. The D layer.
C. The E layer.
D. The F layer.
3C-1-3.1 B
What is the lowest region of the Ionosphere that is
useful for long distance radio wave propagation?
A. The D layer.
B. The E layer.
C. The F1 layer.
D. The F2 layer.
3C-1-4.1 D
Which layer of the Ionosphere is mainly
responsible for long distance sky wave
radio communication?
A. D layer.
B. E layer.
C. F1 layer.
D. F2 layer.
3C-1-4.2 B
What are the two distinct sub-layers of the F layer of
the ionosphere during the daytime?
A. Troposphere and Stratosphere.
B. F1 and F2.
C. Electrostatic and Electromagnetic.
D. D and E.
3C-1-4.3 C
Which two daytime Ionospheric layers
combine into one layer at night?
A. E and F1.
B. D and E.
C. F1 and F2.
D. E1 and E2.
3C-2.1 D
Which layer of the Ionosphere is most responsible for
absorption of radio signals during daylight hours?
A. The E layer.
B. The F1 layer.
E. The F2 layer.
D. The D layer.
3C-2.2 B
When is Ionospheric absorption most pronounced?
A. When Tropospheric ducting occurs.
B. When radio waves enter the D Layer at low angles.
C. When radio waves travel to the F Layer.
D. When a temperature inversion occurs.
3C-2.3 A
During daylight hours, what effect does the D Layer
of the Ionosphere have on 80 meter radio waves?
A. The D Layer absorbs the signals.
B. The D Layer bends the radio waves out into space.
C. The D Layer refracts the radio waves back to Earth.
D. The D Layer has little or no effect
on 80 meter radio wave propagation.
3C-2.4 B
What causes IONOSPHERIC ABSORPTION of radio wave?
A. A lack of D Layer ionization.
B. D Layer ionization.
C. The presence of ionized clouds in the E Layer.
D. Splitting of the F Layer.
3C-3.1 D
What is usually the condition of the
Ionosphere just before sunrise?
A. Atmospheric attenuation is at a maximum.
B. Ionization is at a maximum.
C. The E layer is above the F layer.
D. Ionization is at a minimum.
3C-3.2 C
At what time of day does maximum
ionization of the Ionosphere occur?
A. Dusk.
B. Midnight.
C. Midday.
D. Dawn.
3C-3.3 A
Minimum ionization of the Ionosphere
occurs daily at what time?
A. Shortly before Dawn.
B. Just after Noon.
C. Just after Dusk.
D. Shortly before Midnight.
3C-3.4 B
When is E Layer ionization at a maximum?
A. Dawn.
B. Midday.
C. Dusk.
D. Midnight.
3C-4.1 D
What is the name for the highest radio frequency that will
be refracted back to Earth?
A. Lowest Usable Frequency.
B. Optimum Working Frequency.
C. Ultra High Frequency.
D. Critical Frequency.
3C-4.2 C
What causes the MAXIMUM USABLE FREQUENCY to vary?
A. Variations in the temperature of the air
at Ionospheric levels.
B. Upper atmospheric wind patterns.
C. The amount of ultraviolet and other types
of radiation received from the Sun.
D. Presence of ducting.
3C-4.3 A
What does the term MAXIMUM USABLE FREQUENCY refer to?
A. The maximum frequency that allows a radio signal to
reach its destination in a single hop.
B. The minimum frequency that allows a radio signal to
reach its destination in a single hop.
C. The maximum frequency that allows a radio signal to
be absorbed in the lowest Ionospheric layer.
D. The minimum frequency that allows a radio signal to
be absorbed in the lowest Ionospheric layer.
3C-5.1 C
When two stations are within each other's skip
zone on the frequency being used, what mode of
propagation would it be desirable to use?
A. Ground Wave propagation.
B. Sky Wave propagation.
C. Scatter Mode propagation.
D. Ionospheric Ducting propagation.
3C-5.2 C
You are in contact with a distant station and are operating
at a frequency close to the maximum usable frequency. If
the received signals are weak and somewhat distorted, what
type of propagation are you probably ecperiencing?
A. Tropospheric ducting.
B. Line-of-sight propagation.
C. Backscatter propagation.
D. Waveguide propagation.
3C-6.1 A
What is the transmission path of a wave that travel directly
from the transmitting antenna to the receiving antenna called?
A. Line of sight.
B. The sky wave.
C. The linear wave.
D. The plane wave.
3C-6.2 B
How are VHF signals within the range
of the visible horizon propagated?
A. By sky wave.
B. By direct wave.
C. By plane wave.
D. By geometric wave.
3C-7.1 C
Ducting occurs in which region of the atmosphere?
A. F2.
B. Ionosphere.
C. Troposphere.
D. Stratosphere.
3C-7.2 A
What effect does tropospheric bending
have on 2 meter radio waves?
A. It increases the distance over which
they can be transmitted.
B. It decreases the distance over which
they can be transmitted.
C. It tends to garble 2 meter phone transmissions.
D. It reverses the sideband of 2 meter phone transmissions.
3C-7.3 D
What atmospheric phenomenon causes
tropospheric ducting of radio waves?
A. A very low pressure area.
B. An Aurora to the North.
C. Lightning between the transmitting and receiving station.
D. A temperature inversion.
3C-7.4 A
Tropospheric ducting occurs as
a result of what phenomenon?
A. A temperature inversion.
B. Sun spots.
C. An Aurora to the North.
D. Lightning between the transmitting and receiving station.
3C-7.5 B
What atmospheric phenomenon causes VHF radio
waves to be propagated several hundred miles
through stable air masses over oceans?
A. Presence of a maritime polar air mass.
B. A widespread temperature inversion.
C. An overcast of cirriform clouds.
D. Atmospheric pressure of roughly
29 inches of Mercury or higher.
3C-7.6 D
In what frequency range does
tropospheric ducting occur most often?
A. LF.
B. MF.
C. HF.
D. VHF.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *