- How would you keep unauthorized persons from using your amateur
station at home?
A. Use a key-operated on/off switch in the main power line.
B. Use a carrier operated relay in the main power line.
C. Put a 'Danger High Voltage" sign in the station
D. Put fuses in the main power line.
- How could you best keep unauthorized persons from using a mobile amateur
station in your car?
A. Tune the radio to an unused frequency when you are done using it.
B. Turn the radio off when you are not using it.
C. Disconnect the microphone when you are not using it.
D. Put a "Do Not Touch" sign on the radio
- Why would you use a key-operated on/off switch in the main power line of your
station?
A. For safety, in case the main fuses fail.
B. To keep the power company from turning off your electricity during an
emergency.
C. For safety, to turn off the station in the event of an emergency.
D. To keep unauthorized persons from using your station.
- Why would there be a switch in the high-voltage power supply to turn off the
power if its cabinet is opened?
A. To keep anyone opening the cabinet from getting shocked by dangerous
high voltages.
B. To keep dangerous RF radiation from leaking out through an open cabinet.
C. To keep dangerous RF radiation from coming in through an open cabinet.
D. To turn the power supply off when its not being used.
- How little electrical current flowing through the human body can be fatal?
A. Approximately 10 amperes.
B. More than 20 amperes.
C. Current flowing through the human body is never fatal.
D. As little as 1/10 of an ampere.
- Which body organ can be fatally affected by a very small amount of electrical
current?
A. The heart.
B. The brain.
C. The liver.
D. The lungs.
- What is the minimum voltage that is usually dangerous to humans?
A. 100 volts.
B. 1000 volts.
C. 2000 volts.
D. 30 volts.
- What should you do if you discover someone who is being burned by high
voltage?
A. Wait for a few minutes to see if the person can get away from the high
voltage on their own, then try to help.
B. Immediately drag the person away from the high voltage.
C. Turn off the power, call for emergency help and give CPR if needed.
D. Run from the area so you won’t be burned too.
- What is the safest method to remove an unconscious person from contact with a
high voltage source?
A. Turn off the high voltage switch before removing the person from contact
with the source.
B. Wrap the person in a blanket and pull him to a safe area.
C. Call an electrician.
D. Remove the person by pulling on an arm or leg.
- Before checking for a fault in a mains operated power supply unit, it would be
safest to FIRST:
A. turn off the power and remove the power plug
B. short out leads of filter capacitors
C. check action of capacitor bleeder resistor
D. remove and check fuse from power supply.
- Fault finding in a power supply of an amateur transmitter while the power supply
is operating is not a recommended technique because of the risk of:
A. electric shock
B. damaging the transmitter
C. overmodulation
D. blowing the fuse
- For best protection from electric shock, what should be grounded in an amateur
station?
A. The antenna feed line.
B. All station equipment.
C. The AC power line
D. The power supply primary.
- If a separate ground system is not possible for your amateur station, an alternative
indoor grounding point could be:
A. a metallic cold water pipe
B. a plastic cold water pipe
C. a window screen
D. a metallic natural gas pipe
- To protect you against electrical shock, the chassis of each piece of your station
equipment should be connected to:
A. a good ground connection
B. a dummy load
C. insulated shock mounts
D. the antenna
- Which of these materials is best for a ground rod driven into the earth?
A. Hard plastic.
B. Iron or steel.
C. Fiberglass.
D. Copper-clad steel.
- If you ground your station equipment to a ground rod driven into the earth, what
is the shortest length the rod should be?
A. 1.25 meters (4 ft.).
B. 2 meters (6 ft.).
C. 3.25 meters (10 ft.).
D. 2.5 meters (8 ft.).
- Where should the green wire in a three-wire AC line cord be
connected in a power supply?
A. To the white wire.
B. To the hot side of the power switch
C. To the chassis.
D. To the fuse.
- If your third-floor amateur station has a ground wire running 10.05 meters (33
feet) down to the ground rod, why might you get an RF burn if you touch the front
panel of your transceiver?
A. Because of a bad antenna connection, allowing the RF energy to take an
easier path out of the transceiver through you.
B. Because the transceiver’s heat-sensing circuit is not working to start the
cooling fan.
C. Because the ground wire is a resonant length on several HF bands and acts
more like an antenna than an RF ground connection.
D. Because the ground rod is not making good contact with the moist earth.
- What is one good way to avoid any stray RF energy in your amateur station?
A. Make a couple of loops in the ground wire where it connects to your
station.
B. Drive a ground rod at least 420 cm (14 feet) into the ground.
C. Keep the station’s ground wire as short as possible.
D. Use a beryllium ground wire for best conductivity.
- Which statement about station grounding is true?
A. A ground loop is an effective way to ground station equipment.
B. If the chassis of all station equipment is connected to a good conductor,
there is no need to tie then to an earth ground.
C. RF hot spots can occur in a station located above the ground floor if the
equipment is grounded by a long ground wire.
D. The chassis of each piece of equipment should be tied together with high-
impedance conductors.
- On mains operated power supplies, the ground wire should be connected to the
metal chassis of the power supply. This ensures, in case there is a fault in the
power supply, that the chassis:
A. does not become conductive to prevent electric shock
B. becomes conductive to prevent electric shock
C. develops a high voltage compared to ground
D. does not develop a high voltage with respect to ground
- The purpose of using a three-wire power cord and plug on amateur radio
equipment is to:
A. prevent the plug from being reversed in the wall outlet
B. prevent the chassis from becoming live in case of an internal short to the
chassis
C. prevent short circuits
D. make it inconvenient to use
- Why should you ground all antennas and rotor cables when your amateur station
is not in use?
A. To lock the antenna system in one position.
B. To protect the station and building from lightning damage.
C. To avoid radio frequency interference.
D. To make sure everything will stay in place.
- How can an antenna system 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. Install a fuse in the antenna feed line.
D. Ground all antennas when they are not in use.
- How can amateur station equipment best be protected from lightning damage?
A. Disconnect all equipment from the power line and antenna cables.
B. Use heavy insulation on the wiring.
C. Never turn off the equipment.
D. Disconnect the ground system from all radios.
- What equipment should be worn for working on an antenna tower?
A. A reflective vest of approved color.
B. Approved equipment in accordance with provincial safety standards
concerning climbing.
C. A flashing red, yellow or white light.
D. A grounding chain.
- Why should you wear a safety belt if you are working on an antenna tower?
A. To safely bring any tools you might use up and down the tower.
B. To keep the tower from becoming unbalanced while you are working.
C. To prevent you from accidentally falling.
D. To safely hold your tools so they don’t fall and injure someone on the
ground.
- For safety, how high should you place a horizontal wire antenna?
A. Above high-voltage electrical lines.
B. Just high enough so you can easily reach it for adjustments or repairs.
C. High enough so no one can touch any part of it from the ground.
D. As close to the ground as possible.
- Why should you wear a hard hat 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. So someone passing by will know that the work is being done on the tower
and will stay away.
D. To protect your head from something dropped from the tower.
- Why should your outside antennas be high enough so that no one can touch them
while you are transmitting?
A. Touching the antenna might reflect the signal back to the transmitter and
cause damage.
B. Touching the antenna might radiate harmonics.
C. Touching the antenna might cause RF burns.
D. Touching the antenna might cause television interference.
- Why should you make sure that no one can touch an open-wire feed line while
you are transmitting with it?
A. Because contact might break the feed line.
B. Because high-voltage radio energy might burn the person.
C. Because contact might cause spurious emissions.
D. Because contact might cause a short circuit and damage the transmitter.
- What safety precautions should you take before beginning repairs on an antenna?
A. Be sure to turn off the transmitter and disconnect the feed line.
B. Be sure you and the antenna structure are grounded.
C. Inform your neighbors so they are aware of your intentions.
D. Turn off the main power switch in your house.
- What precaution should you take when installing a ground-mounted antenna?
A. It should be painted so that people and animals won’t run into it.
B. It should not be installed in a wet area.
C. It should be installed so no one can come in contact with it.
D. It should not be installed higher than you can reach.
- What should you do for safety when operating on 1270 MHz?
A. Keep the antenna away from your eyes when RF is applied.
B. Make sure that an RF leakage filter is installed at the antenna feed point.
C. Make sure the standing wave ratio is low before you conduct a test.
D. Never use a horizontally polarized antenna.
- What should you do for safety if you put up a UHF transmitting antenna?
A. Make sure the antenna is near the ground to keep its RF energy pointing in
the correct direction.
B. Make sure it will be in a place where no one can get near it when you are
transmitting.
C. Make sure you connect an RF leakage filter at the antenna feed point.
D. Make sure the RF field screens are in place.
- What should you do for safety, before removing the shielding on a UHF power
amplifier?
A. Make sure RF leakage filters are connected.
B. Make sure the antenna feed line is properly grounded.
C. Make sure the amplifier cannot be accidentally turned on.
D. Make sure all RF screens are in place at the antenna feed line.
- Why should you make sure the antenna of a hand-held transceiver is not close to
your head while transmitting?
A. To use your body to reflect the signal in one direction.
B. To reduce your exposure to the radio-frequency energy.
C. To keep static charges from building up.
D. To help the antenna to radiate energy equally well in all directions.
- How should you position the antenna of a hand-held transceiver while you are
transmitting?
A. Pointed toward the station you are contacting.
B. Pointed away from the station you are contacting.
C. Pointed down to bounce the signal off the ground.
D. Away from your head and away from others.
- How can exposure to a large amount of RF energy affect body tissue?
A. It causes radiation poisoning.
B. It paralyzes the tissue.
C. It produces genetic changes in the tissue.
D. It heats the tissue.
- Which body organ is most likely to be damaged from the heating effects of RF
radiation?
A. Heart.
B. Eyes.
C. Liver.
D. Hands.
- Depending on the wavelength of the signal, the energy density of the RF field,
and other factors, in what way can RF energy affect body tissue?
A. It causes radiation poisoning.
B. It causes blood flow to stop.
C. It produces genetic changes in the tissue.
D. It heats the tissue.
- If you operate your amateur station with indoor antennas, what precautions should
you take when you install them?
A. Position the antennas parallel to electrical power wires to take advantage
of parasitic effects.
B. Position the antennas along the edge of a wall where it meets the floor to
reduce parasitic effects.
C. Locate the antennas as far away as possible from living spaces that will be
occupied while you are transmitting.
D. Locate the antennas close to your operating position to minimize feed line
length.
- Why should directional high gain antennas be mounted higher than nearby
structures?
A. So they will not direct RF energy toward people in nearby structures.
B. So they will be dried by the wind after a heavy rain storm.
C. So they will not damage nearby structures with RF energy.
D. So they will receive more sky waves and fewer ground waves.
- For best RF safety, where should the ends and center of a dipole antenna be
located?
A. As high as possible to prevent people from coming in contact with the
antenna.
B. Near or over moist ground so RF energy will be radiated away from the
ground.
C. As close to the transmitter as possible so RF energy will be concentrated
near the transmitter.
D. Close to the ground so simple adjustments can be easily made without
climbing a ladder.
- What organization has published safety guidelines for the maximum limits of
exposure of RF energy near the human body?
A. Canadian Standards Association.
B. Environment Canada.
C. Transport Canada.
D. Health Canada.
- What is the purpose of Safety Code 6?
A. It gives RF exposure levels for the human body.
B. It lists all RF frequency allocations for interference protection.
C. It sets transmitter power limits for interference protection.
D. It sets antenna height limits for aircraft protection.
- According to Safety Code 6, what frequencies cause us the greatest from RF
energy?
A. 300 to 3000 MHz.
B. 30 to 300 MHz.
C. Above 1500 MHz.
D. 3 to 30 MHz.
- Why is the exposure to RF the lowest in the frequency range of 30 to 300 MHz,
according to Safety Code 6?
A. There are more transmitters operating in this range.
B. There are fewer transmitters operating in this range.
C. Most transmissions in this range are for a longer time.
D. The human body absorbs energy the most in this range.
- According to Safety Code 6, what is the maximum safe power output to the
antenna of a hand-held VHF or UHF radio?
A. 10 watts
B. not specified-the exemption for portable equipment was withdrawn in
1999.
C. 25 watts.
D. 125 milliwatts.
- Which of the following statements is NOT correct?
A. Maximum exposure levels of RF fields to the general population, in the
frequency range 10 to 3000 MHz, is 28 VRMS/meter (E-field).
B. Permissible exposure of RF fields increases as frequency in increased
above 300 MHz.
C. Permissible exposure levels of RF fields increases as frequency is
decreased below 10 MHz.
D. Permissible exposure levels of RF fields decreases as frequency is
decreased below 10 MHz.
- The permissible exposure levels of RF fields:
A. decreases as frequency is decreased below 10 MHz.
B. increases, as frequency is increased above 300 MHz.
C. increases, as frequency is increased from 10 to 300 MHz.
D. decreases, as frequency is increased above 300 MHz.
- Which statement is NOT correct:
A. maximum exposure level of RF fields for general population, in the range
from 10 to 300 MHz, is 28 V RMS per meter (E-field).
B. portable transmitters, operating below 1 GHz with a power output of 7
watts, are excluded from Safety Code 6 requirements.
C. maximum exposure level of RF fields for general population, in the range
30 to 300 MHz, is .073 A RMS per meter (H-field).
D. the exemption of portable transmitters, operating below 1 GHz with a
power output of 7 watts was removed from Safety Code 6 in 1999.
- Which statement is correct?
A. Safety Code 6 regulates operation of receivers only.
B. The operation of portable transmitting equipment is of no concern in
Safety Code 6.
C. Portable transmitters, operating below 1 GHz, with an output power equal
to, or less than 7 watts, are exempt from the requirements of Safety Code
6.
D. The exemption for portable transmitters was eliminated in Safety Code 6
in 1999.
- The maximum exposure level of RF fields for general population, in
the frequency range 10 to 300 MHz is ______ V RMS per meter (E-field).
A. 7
B. 37
C. 0.073
D. 28