T0A: AC power circuits, hazardous voltages, fuses and circuit breakers, grounding, lightning protection, battery safety, electrical code compliance
T0A01:
What is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
30 volts
12 volts
120 volts
300 volts
T0A02:
What is the lowest amount of electrical current flowing through the human body that is likely to cause death?
100 milliamperes
10 microamperes
10 amperes
100 amperes
T0A03:
What is connected to the green wire in a three-wire electrical plug?
Ground
Neutral
Hot
The white wire
T0A04:
What is the purpose of a fuse in an electrical circuit?
To interrupt power in case of overload
To make sure enough power reaches the circuit
To prevent television interference
To prevent shocks
T0A05:
What might happen if you install a 20-ampere fuse in your transceiver in the place of a 5-ampere fuse?
Excessive current could cause a fire
The larger fuse would better protect your transceiver from using too much current
The transceiver will run cooler
The transceiver would not be able to produce as much RF output
T0A06:
What is a good way to guard against electrical shock at your station?
All of these answers are correct
Use 3-wire cords and plugs for all AC powered equipment
Connect all AC powered station equipment to a common ground
Use a ground-fault interrupter at each electrical outlet
T0A07:
What is the most important thing to consider when installing an emergency disconnect switch at your station?
Everyone should know where it is and how to use it
It must always be as near to the operator as possible
It must always be as far away from the operator as possible
It should be installed in a metal box to prevent tampering
T0A08:
What precautions should be taken when a lightning storm is expected?
All of these answers are correct
Disconnect the antenna cables from your station and move them away from your radio equipment
Unplug all power cords from AC outlets
Stop using your radio equipment and move to another room until the storm passes
T0A09:
What is one way to recharge a 12-volt battery if the commercial power is out?
Connect the battery to a car's battery and run the engine
You cannot recharge a battery unless the power is back on
Add water to the battery
Take your battery to the utility company for a recharge
T0A10:
What kind of hazard is presented by a conventional 12-volt storage battery?
All of these answers are correct
It contains dangerous acid that can spill and cause injury
Short circuits can damage wiring and possibly cause a fire
Explosive gas can collect if not properly vented
T0A11:
What can happen if a storage battery is charged or discharged too quickly?
The battery could overheat and give off dangerous gas or explode
The terminal voltage will oscillate rapidly
The warranty will be voided
The voltage will be reversed
T0A12:
What is the most important reason to have a lightning protection system for your amateur radio station?
Fire prevention
Lower insurance rates
Improved reception
Noise reduction
T0A13:
What kind of hazard might exist in a power supply when it is turned off and disconnected?
You might receive an electric shock from stored charge in large capacitors
Static electricity could damage the grounding system
Circulating currents inside the transformer might cause damage
The fuse might blow if you remove the cover
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
