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ELE2D
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1992-01-26
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FCC NOVICE Exam Question Pool. Subelement 2D.
Amateur Radio Practice. 4 Questions.
---------------------------------------------------
2D 1.1 B
How can you prevent the use of your amateur station by
unauthorized persons?
A. Install a carrier-operated relay in the main power
line
B. Install a key-operated "ON/OFF" switch in the main
power line
C. Post a "Danger - High Voltage" sign in the station
D. Install ac line fuses in the main power line
2D 1.2 A
What is the purpose of a key-operated "ON/OFF" switch in the
main power line?
A. To prevent the use of your station by unauthorized persons
B. To provide an easy method for the FCC to put your station
off the air
C. To prevent the power company from inadvertently turning off
your electricity during an emergency
D. As a safety feature, to kill all power to the station in the
event of an emergency
2D 2.1 D
Why should all antenna and rotator cables be grounded when
an amateur station is not in use?
A. To lock the antenna system in one position
B. To avoid radio frequency interference
C. To save electricity
D. To protect the station and building from damage due to
a nearby lightning strike
2D 2.2 C
How can an antenna system be protected from damage caused
by a nearby lightning strike?
A. Install a balun at the antenna feed point
B. Install an Rf choke in the feed line
C. Ground all antennas when they are not in use
D. Install a line fuse in the antenna wire
2D 2.3 D
How can amateur station equipment be protected from damage
caused by voltage induced in the power lines by a nearby
lightning strike?
A. Use heavy insulation on the wiring
B. Keep the equipment on constantly
C. Disconnect the ground system
D. Disconnect all equipment after use, either by unplugging
or by using a main disconnect switch
2D 2.4 B
For proper protection from lightning strikes, what equipment
should be grounded in an amateur station?
A. The power supply primary
B. All station equipment
C. The feed line center conductors
D. The ac power mains
2D 3.1 A
What is a convenient indoor grounding point for an
amateur station?
A. A metallic cold water pipe
B. PVC plumbing
C. A window screen
D. A natural gas pipe
2D 3.2 C
To protect against electrical shock hazards, what should you
connect the chassis of each piece of your equipment to?
A. Insulated shock mounts
B. The antenna
C. A good ground connection
D. A circuit breaker
2D 3.3 B
What type of material should a driven ground rod
be made of?
A. Ceramic of other good insulator
B. Copper or copper-clad steel
C. Iron or steel
D. Fiberglass
2D 3.4 C
What is the shortest ground rod you should consider installing
for your amateur station RF ground?
A. 4 foot
B. 6 foot
C. 8 foot
D. 10 foot
2D 4.1 B
What precautions should you take when working with 1270-MHz
waveguide?
A. Make sure that the RF leakage filters are installed at
both ends of the waveguide
B. Never look into the open end of a waveguide when RF is
applied
C. Minimize the standing-wave ratio before you test the
waveguide
D. Never have both ends of the waveguide open at the same
time when RF is applied
2D 4.2 A
What precautions should you take when you mount a UHF antenna
in a permanent location?
A. Make sure that no one can be near the antenna when you are
transmitting
B. Make sure that the RF field screens are in place
C. Make sure that the antenna is near the ground to maximize
directional effect
D. Make sure you connect an RF leakage filter at the antenna
feed point
2D 4.3 C
What precautions should you take before removing the shielding
on a UHF power amplifier?
A. Make sure all RF screens are in place at the antenna
B. Make sure the feed line is properly grounded
C. Make sure the amplifier cannot be accidentally energized
D. Make sure that the RF leakage filters are connected
2D 4.4 A
Why should you use only good-quality, well-constructed coaxial
cable and connectors for a UHF antenna system?
A. To minimize RF leakage
B. To reduce parasitic oscillations
C. To maximize the directional characteristics of your antenna
D. To maximize the standing-wave ratio of the antenna system
2D 4.5 B
Why should you be careful to position the antenna of your
220-MHz hand-held transceiver away from your head when you
are transmitting?
A. To take advantage of the directional effect
B. To minimize RF exposure
C. To use your body to reflect the signal, improving the
directional characteristics of the antenna
D. To minimize static discharges
2D 4.6 B
Which of the following types of radiation produce health risks
most like the risks produced by radio frequency radiation?
A. Microwave oven radiation and ultraviolet radiation
B. Microwave oven radiation and radiation from an electric space
heater
C. Radiation from Uranium or Radium and ultraviolet radiation
D. Sunlight and radiation from an electric space heater
2D 5.1 D
Why is there a switch that turns off the power to a
high-voltage power supply if the cabinet is opened?
A. To prevent RF from escaping from the supply
B. To prevent RF from entering the supply through the
open cabinet
C. To provide a way to turn the power supply on and off
D. To reduce the danger of electrical shock
2D 5.2 A
What purpose does a safety interlock on an amateur transmitter
serve?
A. It reduces the danger that the operator will come in contact
with dangerous high voltages when the cabinet is opened while
the power is on
B. It prevents the transmitter from being turned on accidentally
C. It prevents RF energy from leaking out of the transmitter cabinet
D. It provides a way for the station licensee to ensure that only
authorized operators can turn the transmitter on
2D 6.1 D
What type of safety equipment should you wear when you are
working at the top of an antenna tower?
A. A grounding chain
B. A reflective vest
C. Loose clothing
D. A carefully inspected safety belt
2D 6.2 D
Why should you wear a safety belt when you are working at the top
of an antenna tower?
A. To provide a way to safely hold your tools so they don't fall
and injure someone on the ground
B. To maintain a balanced load on the tower while you are working
C. To provide a way to safely bring tools up and down the tower
D. To prevent an accidental fall
2D 6.3 A
For safety purposes, how high should you locate all portions of
your horizontal wire antenna?
A. High enough so that a person cannot touch them from the ground
B. Higher than chest level
C. Above knee level
D. Above electrical lines
2D 6.4 D
What type of safety equipment should you wear when you are on the
ground assisting someone who is working on an antenna tower?
A. A reflective vest
B. A safety belt
C. A grounding chain
D. A hard hat
2D 6.5 A
Why should you wear a hard hat when you are on the ground
assisting someone who is working on an antenna tower?
A. To avoid injury from tools dropped from the tower
B. To provide an RF shield during antenna testing
C. To avoid injury if the tower should accidentally collapse
D. To avoid injury from walking into tower guy wires
2D 7-1.1 C
What accessory is used to measure standing wave ratio?
A. An ohm meter
B. An ammeter
C. An SWR meter
D. A current bridge
2D 7-1.2 D
What instrument is used to indicate the relative impedance
match between a transmitter and antenna?
A. An ammeter
B. An ohmmeter
C. A voltmeter
D. An SWR meter
2D 7-2.1 B
What does an SWR-meter reading of 1:1 indicate?
A. An antenna designed for use on another frequency band is
probably connected
B. An optimum impedance match has been attained
C. No power is being transferred to the antenna
D. An SWR meter never indicates 1:1 unless it is defective
2D 7-2.2 C
What does an SWR-meter reading of less than 1.5:1 indicate?
A. An unacceptably low reading
B. An unacceptably high reading
C. An acceptable impedance match
D. An antenna gain of 1.5
2D 7-2.3 D
What does an SWR-meter reading of 4:1 indicate?
A. An unacceptably low reading
B. An acceptable impedance match
C. An antenna gain of 4
D. An impedance mismatch, which is not acceptable; it
indicates problems with the antenna system
2D 7-2.4 C
What does an SWR-meter reading of 5:1 indicate?
A. The antenna will make a 1O-watt signal as strong
as a 50-watt signal
B. Maximum power is being delivered to the antenna
C. An unacceptable mismatch is indicated
D. A very desirable impedance match has been attained
2D 7-3.1 A
What kind of SWR meter reading may indicate poor electrical
contact between parts of an antenna system?
A. An erratic reading
B. An unusually low reading
C. No reading at all
D. A negative reading
2D 7-3.2 A
What does an unusually high SWR-meter reading indicate?
A. That the antenna is not the correct length, or that there is
an open or shorted connection somewhere in the feed line
B. That the signals arriving at the antenna are unusually strong,
indicating good radio conditions
C. That the transmitter is producing more power than normal,
probably indicating that the final amplifier tubes or transistors
are about to go bad
D. That there is an unusually large amount of solar white-noise
radiation, indicating very poor radio conditions
2D 7-3.3 B
The SWR-meter reading at the low-frequency end of an amateur band
is 2.5:1, and the SWR-meter reading at the high-frequency end of
the same band is 5:1. What does this indicate about your antenna?
A. The antenna is broadbanded
B. The antenna is too long for operation on this band
C. The antenna is too short for operation on this band
D. The antenna has been optimized for operation on this band
2D 7-3.4 C
The SWR-meter reading at the low-frequency end of an amateur band
is 5:1, and the SWR-meter reading at the high-frequency end of the
same band is 2.5:1. What does this indicate about your antenna?
A. The antenna is broadbanded
B. The antenna is too long for operation on this band
C. The antenna is too short for operation on this band
D. Grounding the receiver makes the problem worse
2D 8-1.1 C
What is meant by receiver overload?
A. Interference caused by transmitter harmonics
B. Interference caused by overcrowded band conditions
C. Interference caused by strong signals from a nearby
transmitter
D. Interference caused by turning the receiver volume
too high
2D 8-1.2 B
What is a likely indication that radio-frequency interference
to a receiver is caused by front-end overload?
A. A low pass filter at the transmitter reduces interference
sharply
B. The interference is independent of frequency
C. A high pass filter at the receiver reduces interference
little or not at all
D. Grounding the receiver makes the problem worse
2D 8-1.3 C
Your neighbor reports interference to his television whenever you
are transmitting from your amateur station. This interference occurs
regardless of your transmitter frequency. What is likely to be the
cause of the interference?
A. Inadequate transmitter harmonic suppression
B. Receiver VR tube discharge
C. Receiver overload
D. Incorrect antenna length
2D 8-1.4 B
What type of filter should be installed on a TV receiver as the
first step in preventing RF overload from an amateur HF station
transmission?
A. Low pass
B. High pass
C. Band pass
D. Notch
2D 8-2.1 A
What is meant by harmonic radiation?
A. Transmission of signals at whole number multiples of the
fundamental (desired) frequency
B. Transmission of signals that include a superimposed 60-Hz hum
C. Transmission of signals caused by sympathetic vibrations from
a nearby transmitter
D. Transmission of signals to produce a stimulated emission in
the air to enhance skip propagation
2D 8-2.2 A
Why is harmonic radiation from an amateur station undesirable?
A. It will cause interference to other stations and may result
in out-of-band signal radiation
B. It uses large amounts of electric power
C. It will cause sympathetic vibrations in nearby transmitters
D. It will produce stimulated emission in the air above the
transmitter, thus causing aurora
2D 8-2.3 A
What type of interference may radiate from a multi-band
antenna connected to an improperly tuned transmitter?
A. Harmonic radiation
B. Auroral distortion
C. Parasitic excitation
D. Intermodulation
2D 8-2.4 C
What is the purpose of shielding in a transmitter?
A. It gives the low pass filter structural stability
B. It enhances the microphonic tendencies of
radiotelephone transmitters
C. It prevents unwanted RF radiation
D. It helps maintain a sufficiently high operating
temperature in circuit components
2D 8-2.5 D
Your neighbor reports interference on one or two channels of her
television when you are transmitting from your amateur station.
This interference only occurs when you are operating on 15 meters.
What is likely to be the cause of the interference?
A. Excessive low-pass filtering on the transmitter
B. Sporadic E de-ionization near your neighbor's TV antenna
C. TV Receiver front-end overload
D. Harmonic radiation from your transmitter
2D 8-2.6 B
What type of filter should be installed on an amateur transmitter
as the first step in reducing harmonic radiation?
A. Key click filter
B. Low pass filter
C. High pass filter
D. CW filter
2D 8-3.1 A
If you are notified that your amateur station is causing television
interference, what should you do first?
A. Make sure that your amateur equipment is operating properly,
and that it does not cause interference to your own television
B. Immediately turn off your transmitter and contact the nearest
FCC office for assistance
C. Install a high-pass filter at the transmitter output and a low-
pass filter at the antenna-input terminals of the TV
D. Continue operating normally, since you have no legal obligation
to reduce or eliminate the interference
2D 8-3.2 B
Your neighbor informs you that you are causing television
interference, but you are sure your amateur equipment is
operating properly and you cause no interference to your
own TV. What should you do?
A. Immediately turn off your transmitter and contact the
nearest FCC office for assistance
B. Work with your neighbor to determine that you are actually
the cause of the interference
C. Install a high-pass filter at the transmitter output and
a low-pass filter at the antenna-input terminals of the TV
D. Continue operating normally, since you have no legal
obligation to reduce or eliminate the interference
--------------------------------------------------
End of Subelement 2D.