Topic G0: Electrical and RF Safety
G0A-2011: RF safety principles, rules and guidelines; routine station evaluation
G0A01-2011:
What is one way that RF energy can affect human body tissue?
It heats body tissue
It causes radiation poisoning
It causes the blood count to reach a dangerously low level
It cools body tissue
G0A02-2011:
Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)?
All of these choices are correct
Its duty cycle
Its frequency
Its power density
G0A03-2011:
How can you determine that your station complies with FCC RF exposure regulations?
All of these choices are correct
By calculation based on FCC OET Bulletin 65
By calculation based on computer modeling
By measurement of field strength using calibrated equipment
G0A04-2011:
What does "time averaging" mean in reference to RF radiation exposure?
The total RF exposure averaged over a certain time
The average time of day when the exposure occurs
The average time it takes RF radiation to have any long-term effect on the body
The total time of the exposure
G0A05-2011:
What must you do if an evaluation of your station shows RF energy radiated from your station exceeds permissible limits?
Take action to prevent human exposure to the excessive RF fields
File an Environmental Impact Statement (EIS-97) with the FCC
Secure written permission from your neighbors to operate above the controlled MPE limits
All of these choices are correct
G0A07-2011:
What effect does transmitter duty cycle have when evaluating RF exposure?
A lower transmitter duty cycle permits greater short-term exposure levels
A higher transmitter duty cycle permits greater short-term exposure levels
Low duty cycle transmitters are exempt from RF exposure evaluation requirements
High duty cycle transmitters are exempt from RF exposure requirements
G0A08-2011:
Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations when transmitter power exceeds levels specified in part 97.13?
Perform a routine RF exposure evaluation
Post a copy of FCC Part 97 in the station
Post a copy of OET Bulletin 65 in the station
All of these choices are correct
G0A09-2011:
What type of instrument can be used to accurately measure an RF field?
A calibrated field-strength meter with a calibrated antenna
A receiver with an S meter
A betascope with a dummy antenna calibrated at 50 ohms
An oscilloscope with a high-stability crystal marker generator
G0A10-2011:
What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna?
Take precautions to ensure that the antenna cannot be pointed in their direction
Change from horizontal polarization to vertical polarization
Change from horizontal polarization to circular polarization
Use an antenna with a higher front-to-back ratio
G0A11-2011:
What precaution should you take if you install an indoor transmitting antenna?
Make sure that MPE limits are not exceeded in occupied areas
Locate the antenna close to your operating position to minimize feed-line radiation
Position the antenna along the edge of a wall to reduce parasitic radiation
No special precautions are necessary if SSB and CW are the only modes used
G0A12-2011:
What precaution should you take whenever you make adjustments or repairs to an antenna?
Turn off the transmitter and disconnect the feed line
Ensure that you and the antenna structure are grounded
Wear a radiation badge
All of these choices are correct
G0A13-2011:
What precaution should be taken when installing a ground-mounted antenna?
It should be installed so no one can be exposed to RF radiation in excess of maximum permissible limits
It should not be installed higher than you can reach
It should not be installed in a wet area
It should limited to 10 feet in height
G0B-2011: Safety in the ham shack: electrical shock and treatment, safety grounding, fusing, interlocks, wiring, antenna and tower safety
G0B01-2011:
Which wire or wires in a four-conductor line cord should be attached to fuses or circuit breakers in a device operated from a 240-VAC single-phase source?
Only the hot wires
Only the neutral wire
Only the ground wire
All wires
G0B02-2011:
What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current?
AWG number 12
AWG number 20
AWG number 16
AWG number 8
G0B03-2011:
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
15 amperes
100 amperes
60 amperes
30 amperes
G0B04-2011:
Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?
Danger of carbon monoxide poisoning
Danger of engine over torque
Lack of oxygen for adequate combustion
Lack of nitrogen for adequate combustion
G0B05-2011:
Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?
Current flowing from one or more of the hot wires directly to ground
Current flowing from one or more of the hot wires to the neutral wire
Over-voltage on the hot wire
All of these choices are correct
G0B06-2011:
Why must the metal enclosure of every item of station equipment be grounded?
It ensures that hazardous voltages cannot appear on the chassis
It prevents blowing of fuses in case of an internal short circuit
It prevents signal overload
It ensures that the neutral wire is grounded
G0B07-2011:
Which of the following should be observed for safety when climbing on a tower using a safety belt or harness?
Always attach the belt safety hook to the belt D-ring with the hook opening away from the tower
Never lean back and rely on the belt alone to support your weight
Ensure that all heavy tools are securely fastened to the belt D-ring
Make sure that your belt is grounded at all times
G0B08-2011:
What should be done by any person preparing to climb a tower that supports electrically powered devices?
Make sure all circuits that supply power to the tower are locked out and tagged
Notify the electric company that a person will be working on the tower
Unground the base of the tower
All of these choices are correct
G0B09-2011:
Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?
A soldered joint will likely be destroyed by the heat of a lightning strike
The resistance of solder is too high
Solder flux will prevent a low conductivity connection
Solder has too high a dielectric constant to provide adequate lightning protection
G0B10-2011:
Which of the following is a danger from lead-tin solder?
Lead can contaminate food if hands are not washed carefully after handling
High voltages can cause lead-tin solder to disintegrate suddenly
Tin in the solder can “cold flow” causing shorts in the circuit
RF energy can convert the lead into a poisonous gas
G0B11-2011:
Which of the following is good engineering practice for lightning protection grounds?
They must be bonded together with all other grounds
They must be bonded to all buried water and gas lines
Bends in ground wires must be made as close as possible to a right angle
Lightning grounds must be connected to all ungrounded wiring
G0B12-2011:
What is the purpose of a transmitter power supply interlock?
To ensure that dangerous voltages are removed if the cabinet is opened
To prevent unauthorized access to a transmitter
To guarantee that you cannot accidentally transmit out of band
To shut off the transmitter if too much current is drawn
G0B13-2011:
What must you do when powering your house from an emergency generator?
Disconnect the incoming utility power feed
Insure that the generator is not grounded
Insure that all lightning grounds are disconnected
All of these choices are correct
G0B14-2011:
Which of the following is covered by the National Electrical Code?
Electrical safety inside the ham shack
Acceptable bandwidth limits
Acceptable modulation limits
RF exposure limits of the human body
G0B15-2011:
Which of the following is true of an emergency generator installation?
The generator should be located in a well ventilated area
The generator should be insulated from ground
Fuel should be stored near the generator for rapid refueling in case of an emergency
All of these choices are correct
G0B16-2011:
When might a lead acid storage battery give off explosive hydrogen gas?
When being charged
When stored for long periods of time
When being discharged
When not placed on a level surface
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