T3A Line of sight; reflection of VHF/UHF signals
T3A01
@T3A01
How are
VHF signals propagated within the range of the visible
horizon?
A. By sky wave
B. By line of sight
C. By plane wave
D. By geometric refraction
T3A02
@N3A01
When a
signal travels in a straight line from one antenna to another,
what is
this called?
A. Line-of-sight propagation
B. Straight line propagation
C. Knife-edge diffraction
D. Tunnel ducting
T3A03
@N3A02
How do
VHF and UHF radio waves usually travel from a transmitting
antenna
to a receiving antenna?
A. They bend through the ionosphere
B. They go in a straight line
C. They wander in any direction
D. They move in a circle going either east or
west from the
transmitter
T3A04
@T3A12
What
type of propagation usually occurs from one hand-held VHF
transceiver
to another nearby?
A. Tunnel propagation
B. Sky-wave propagation
C. Line-of-sight propagation
D. Auroral propagation
T3A05
@N3A10
What
causes the ionosphere to form?
A. Solar radiation ionizing the outer
atmosphere
B. Temperature changes ionizing the outer
atmosphere
C. Lightning ionizing the outer atmosphere
D. Release of fluorocarbons into the atmosphere
T3A06
@N3A11
What
type of solar radiation is most responsible for ionization in the
outer
atmosphere?
A. Thermal
B. Non-ionized particle
C. Ultraviolet
D. Microwave
T3A07
@N3A15
Which
two daytime ionospheric regions combine into one region at
night?
A. E and F1
B. D and E
C. F1 and F2
D. E1 and E2
T3A08
@New
Which
ionospheric region becomes one region at night, but separates
into
two separate regions during the day?
A. D
B. E
C. F
D. All of these choices
T3A09
@New
Ultraviolet
solar radiation is most responsible for ionization in what
part of
the atmosphere?
A. Inner
B. Outer
C. All of these choices
D. None of these choices
T3A10
@New
What
part of our atmosphere is formed by solar radiation ionizing the
outer
atmosphere
A. Ionosphere
B. Troposphere
C. Ecosphere
D. Stratosphere
T3A11
@N3A18
What
can happen to VHF or UHF signals going towards a metal-framed
building?
A. They will go around the building
B. They can be bent by the ionosphere
C. They can be easily reflected by the building
D. They are sometimes scattered in the
ecosphere