Canadian Basic pool, section 3-21

Basic

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Subelement 3

Station Assembly, Practice and Safety

Section 3-21

exposure of human body to RF, safety precautions

3-21-01

What should you do for safety when operating at 1270 MHz?

Correct Answer
A.
Keep 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

3-21-01

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3-21-02

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
Correct Answer
B.
Make sure the antenna 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 that RF field screens are in place

3-21-02

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3-21-03

What should you do for safety, before removing the shielding on a UHF power amplifier?

A.
Make sure that RF leakage filters are connected
B.
Make sure the antenna feed line is properly grounded
Correct Answer
C.
Make sure the amplifier cannot accidentally be turned on
D.
Make sure all RF screens are in place at the antenna feed line

3-21-03

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3-21-04

Why should you make sure the antenna of a hand-held transceiver is not close to your head when transmitting?

A.
To use your body to reflect the signal in one direction
Correct Answer
B.
To reduce your exposure to the radiofrequency energy
C.
To keep static charges from building up
D.
To help the antenna radiate energy equally in all directions

3-21-04

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3-21-05

How should you position the antenna of a hand-held transceiver while you are transmitting?

A.
Pointed towards the station you are contacting
B.
Pointed away from the station you are contacting
C.
Pointed down to bounce the signal off the ground
Correct Answer
D.
Away from your head and away from others

3-21-05

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3-21-06

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
Correct Answer
D.
It heats the tissue

3-21-06

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3-21-07

Which body organ is the most likely to be damaged from the heating effects of RF radiation?

A.
Heart
Correct Answer
B.
Eyes
C.
Liver
D.
Hands

3-21-07

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3-21-08

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
Correct Answer
D.
It heats the tissue

3-21-08

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3-21-09

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 or ceiling to reduce parasitic radiation
Correct Answer
C.
Locate the antennas as far away as possible from living spaces that will be occupied while you are operating
D.
Locate the antennas close to your operating position to minimize feed-line length

3-21-09

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3-21-10

Why should directional high- gain antennas be mounted higher than nearby structures?

Correct Answer
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

3-21-10

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3-21-11

For best RF safety, where should the ends and center of a dipole antenna be located?

Correct Answer
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

3-21-11

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