B-003-18: Electrical hazards, electrical safety, security
B-003-18-01:
How could you best keep unauthorized persons from using your amateur station at home?
Use a key-operated on/off switch in the main power line
Use a carrier-operated relay in the main power line
Put a "Danger - High Voltage" sign in the station
Put fuses in the main power line
B-003-18-02:
How could you best keep unauthorized persons from using a mobile amateur station in your car?
Disconnect the microphone when you are not using it
Tune the radio to an unused frequency when you are done using it
Turn the radio off when you are not using it
Put a "Do not touch" sign on the radio
B-003-18-03:
Why would you use a key-operated on/off switch in the main power line of your station?
To keep unauthorized persons from using your station
For safety, in case the main fuses fail
To keep the power company from turning off your electricity during an emergency
For safety, to turn off the station in the event of an emergency
B-003-18-04:
Why would there be a switch in a high-voltage power supply to turn off the power if its cabinet is opened?
To keep anyone opening the cabinet from getting shocked by dangerous high voltages
To keep dangerous RF radiation from leaking out through an open cabinet
To keep dangerous RF radiation from coming in through an open cabinet
To turn the power supply off when it is not being used
B-003-18-05:
How little electrical current flowing through the human body can be fatal?
As little as 1/10 of an ampere
Approximately 10 amperes
More than 20 amperes
Current flow through the human body is never fatal
B-003-18-06:
Which body organ can be fatally affected by a very small amount of electrical current?
The heart
The brain
The liver
The lungs
B-003-18-07:
What is the minimum voltage which is usually dangerous to humans?
30 volts
100 volts
1000 volts
2000 volts
B-003-18-08:
What should you do if you discover someone who is being burned by high voltage?
Turn off the power, call for emergency help and give CPR if needed
Wait for a few minutes to see if the person can get away from the high voltage on their own, then try to help
Immediately drag the person away from the high voltage
Run from the area so you won't be burned too
B-003-18-09:
What is the safest method to remove an unconscious person from contact with a high voltage source?
Turn off the high voltage switch before removing the person from contact with the source
Wrap the person in a blanket and pull him to a safe area
Call an electrician
Remove the person by pulling an arm or a leg
B-003-18-10:
Before checking a fault in a mains operated power supply unit, it would be safest to FIRST:
turn off the power and remove power plug
short out leads of filter capacitor
check action of capacitor bleeder resistance
remove and check fuse from power supply
B-003-18-11:
Fault finding in a power supply of an amateur transmitter while the supply is operating is not a recommended technique because of the risk of:
electric shock
damaging the transmitter
overmodulation
blowing the fuse
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● = Incorrect answer
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