G0 Questions
23 questions in this subelement. Click any question ID for more details.
Answer: D
Which of the following is used to determine RF exposure from a transmitted signal?
AIts duty cycle
BIts frequency
CIts power density
DAll these choices are correct
Answer: D
How can you determine that your station complies with FCC RF exposure regulations?
ABy calculation based on FCC OET Bulletin 65
BBy calculation based on computer modeling
CBy measurement of field strength using calibrated equipment
DAll these choices are correct
Answer: D
What does “time averaging” mean when evaluating RF radiation exposure?
AThe average amount of power developed by the transmitter over a specific 24-hour period
BThe average time it takes RF radiation to have any long-term effect on the body
CThe total time of the exposure
DThe total RF exposure averaged over a certain period
Answer: A
What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds permissible limits for possible human absorption?
ATake action to prevent human exposure to the excessive RF fields
BFile an Environmental Impact Statement (EIS-97) with the FCC
CSecure written permission from your neighbors to operate above the controlled MPE limits
DAll these choices are correct
Answer: A
What must you do if your station fails to meet the FCC RF exposure exemption criteria?
APerform an RF exposure evaluation in accordance with FCC OET Bulletin 65
BContact the FCC for permission to transmit
CPerform an RF exposure evaluation in accordance with World Meteorological Organization guidelines
DUse an FCC-approved band-pass filter
Answer: A
What is the effect of modulation duty cycle on RF exposure?
AA lower duty cycle permits greater power levels to be transmitted
BA higher duty cycle permits greater power levels to be transmitted
CLow duty cycle transmitters are exempt from RF exposure evaluation requirements
DHigh duty cycle transmitters are exempt from RF exposure requirements
Answer: C
Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?
APost a copy of FCC Part 97.13 in the station
BNotify neighbors within a 100-foot radius of the antenna of the existence of the station and power levels
CPerform a routine RF exposure evaluation and prevent access to any identified high exposure areas
DAll these choices are correct
Answer: B
What type of instrument can be used to accurately measure an RF field strength?
AA receiver with digital signal processing (DSP) noise reduction
BA calibrated field strength meter with a calibrated antenna
CAn SWR meter with a peak-reading function
DAn oscilloscope with a high-stability crystal marker generator
Answer: C
What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?
AChange to a non-polarized antenna with higher gain
BUse an antenna with a higher front-to-back ratio
CTake precautions to ensure that the antenna cannot be pointed in their direction when they are present
DAll these choices are correct
Answer: C
What precaution should be taken if you install an indoor transmitting antenna?
ALocate the antenna close to your operating position to minimize feed-line radiation
BPosition the antenna along the edge of a wall to reduce parasitic radiation
CMake sure that MPE limits are not exceeded in occupied areas
DMake sure the antenna is properly shielded
Answer: D
What stations are subject to the FCC rules on RF exposure?
AAll commercial stations; amateur radio stations are exempt
BOnly stations with antennas lower than one wavelength above the ground
COnly stations transmitting more than 500 watts PEP
DAll stations with a time-averaged transmission of more than one milliwatt
Answer: C
According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?
AAWG number 20
BAWG number 16
CAWG number 12
DAWG number 8
Answer: D
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
A30 amperes
B25 amperes
C20 amperes
D15 amperes
Answer: B
Where should the station’s lightning protection ground system be located?
AAs close to the station equipment as possible
BOutside the building
CNext to the closest power pole
DParallel to the water supply line
Answer: B
Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?
ACurrent flowing from one or more of the hot wires to the neutral wire
BCurrent flowing from one or more of the hot wires directly to ground
COvervoltage on the hot wires
DAll these choices are correct
Answer: C
Which of the following is covered by the National Electrical Code?
AAcceptable bandwidth limits
BAcceptable modulation limits
CElectrical safety of the station
DRF exposure limits of the human body
Answer: B
Which of these choices should be observed when climbing a tower using a safety harness?
AAlways hold on to the tower with one hand
BConfirm that the harness is rated for the weight of the climber and that it is within its allowable service life
CEnsure that all heavy tools are securely fastened to the harness
DAll these choices are correct
Answer: B
What should be done before climbing a tower that supports electrically powered devices?
ANotify the electric company that a person will be working on the tower
BMake sure all circuits that supply power to the tower are locked out and tagged
CUnground the base of the tower
DAll these choices are correct
Answer: A
Which of the following is true of an emergency generator installation?
AThe generator should be operated in a well-ventilated area
BThe generator must be insulated from ground
CFuel should be stored near the generator for rapid refueling in case of an emergency
DAll these choices are correct
Answer: A
Which of the following is a danger from lead-tin solder?
ALead can contaminate food if hands are not washed carefully after handling the solder
BHigh voltages can cause lead-tin solder to disintegrate suddenly
CTin in the solder can “cold flow,” causing shorts in the circuit
DRF energy can convert the lead into a poisonous gas
Answer: D
Which of the following is required for lightning protection ground rods?
AThey must be bonded to all buried water and gas lines
BBends in ground wires must be made as close as possible to a right angle
CLightning grounds must be connected to all ungrounded wiring
DThey must be bonded together with all other grounds
Answer: C
What is the purpose of a power supply interlock?
ATo prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
BTo shut down the unit if it becomes too hot
CTo ensure that dangerous voltages are removed if the cabinet is opened
DTo shut off the power supply if too much voltage is produced
Answer: A
Where should lightning arrestors be located?
AWhere the feed lines enter the building
BOn the antenna, opposite the feed point
CIn series with each ground lead
DAt the closest power pole ground electrode