T4A Lightning protection and station grounding;
safety interlocks,
antenna
installation safety procedures; dummy antennas
T4A01
@N4A04
How can
an antenna system best be protected from lightning damage?
A. Install a balun at the antenna feed point
B. Install an RF choke in the antenna feed line
C. Ground all antennas when they are not in use
D. Install a fuse in the antenna feed line
T4A02
@N4A05
How can
amateur station equipment best be protected from lightning
damage?
A. Use heavy insulation on the wiring
B. Never turn off the equipment
C. Disconnect the ground system from all radios
D. Disconnect all equipment from the power
lines and antenna cables
T4A03
@N4A06
For
best protection from electrical shock, what should be grounded in
an
amateur station?
A. The power supply primary
B. All station equipment
C. The antenna feed line
D. The AC power mains
T4A04
@N4B01
Why
would there be an interlock switch in a high-voltage power supply
to turn
off the power if its cabinet is opened?
A. To keep dangerous RF radiation from leaking
out through an open
cabinet
B. To keep dangerous RF radiation from coming
in through an open
cabinet
C. To turn the power supply off when it is not
being used
D. To keep anyone opening the cabinet from
getting shocked by
dangerous
high voltages
T4A05
@N4B05
Why
should you wear a hard hat and safety glasses if you are on the
ground
helping someone work on an antenna tower?
A. So you won't be hurt if the tower should
accidentally fall
B. To keep RF energy away from your head during
antenna testing
C. To protect your head from something dropped
from the tower
D. So someone passing by will know that work is
being done on the
tower
and will stay away
T4A06
@N4B08
What
safety factors must you consider when using a bow and arrow or
slingshot
and weight to shoot an antenna-support line over a tree?
A. You must ensure that the line is strong
enough to withstand the
shock
of shooting the weight
B. You must ensure that the arrow or weight has
a safe flight path if
the
line breaks
C. You must ensure that the bow and arrow or
slingshot is in good
working
condition
D. All of these choices are correct
T4A07
@N4B09
Which
of the following is the best way to install your antenna in
relation
to overhead electric power lines?
A. Always be sure your antenna wire is higher
than the power line,
and
crosses it at a 90-degree angle
B. Always be sure your antenna and feed line
are well clear of any
power
lines
C. Always be sure your antenna is lower than
the power line, and
crosses
it at a small angle
D. Only use vertical antennas within 100 feet
of a power line
T4A08
@T4D04
What
device is used in place of an antenna during transmitter tests so
that no
signal is radiated?
A. An antenna matcher
B. A dummy antenna
C. A low-pass filter
D. A decoupling resistor
T4A09
@T4D05
Why
would you use a dummy antenna?
A. For off-the-air transmitter testing
B. To reduce output power
C. To give comparative signal reports
D. To allow antenna tuning without causing
interference
T4A10
@T4D06
What
minimum rating should a dummy antenna have for use with a 100
watt
single-sideband phone transmitter?
A. 100 watts continuous
B. 141 watts continuous
C. 175 watts continuous
D. 200 watts continuous
T4A11
@T4D08
Would a
100 watt light bulb make a good dummy load for tuning a
transceiver?
A. Yes; a light bulb behaves exactly like a
dummy load
B. No; the impedance of the light bulb changes
as the filament gets
hot
C. No; the light bulb would act like an open
circuit
D. No; the light bulb would act like a short
circuit