FCC ELEMENT 3 EXAM REPORTED
QUESTIONS WITH ALL CORRECT
ANSWERS
What is the effective radiated power of a repeater with 100 watts transmitter power
output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? -
Answer-126 watts
The Distance Measuring Equipment (DME) measures the distance from the aircraft to
the DME ground station. This is referred to as: - Answer-The slant range
Lines drawn from the VOR station in a particular magnetic direction are: - Answer-
Radials
What is the frequency range of the localizer beam system used by aircraft to find the
centerline of a runway during an Instrument Landing System (ILS) approach to an
airport? - Answer-108.10 MHz to 111.95 MHz
What type of encoding is used in an aircraft's mode C transponder transmission to a
ground station of the Air Traffic Control RADAR Beacon System (ATCRBS)? - Answer-
Pulse position modulation
What type of antenna is attached to an aircraft's Mode C transponder installation and
used to receive 1030 MHz interrogation signals from the Air Traffic Control Radar
Beacon System (ATCRBS)? - Answer-An L-band monopole blade-type omnidirectional
antenna.
What is the function of a commercial aircraft's SELCAL installation? SELCAL is a type
of aircraft communications __________. - Answer-System where a ground-based
transmitter can call a selected aircraft or group of aircraft without the flight crew
monitoring the ground-station frequency
What is the purpose of a shunt resistor used with an ammeter? - Answer-It is used to
increase the ampere indicating range of the ammeter
Which of the following frequency standards is used as a time base standard by field
technicians? - Answer-Rubidium Standard
How does a spectrum analyzer differ from a conventional oscilloscope? - Answer-The
oscilloscope is used to display electrical signals in the time domain while the spectrum
analyzer is used to display electrical signals in the frequency domain.
What does the horizontal axis of a spectrum analyzer display? - Answer-Frequency
, What is the maximum FM deviation for voice operation of a normal wideband channel
on VHF and UHF? - Answer-5.0 kHz
Which of the following is the preferred method of cleaning solder from plated-through
circuit-board holes? - Answer-Use a vacuum device
What tolerance off of plumb should a single base station radio rack be installed? -
Answer-Just inside the bubble on a level
The tachometer of a building's elevator circuit experiences interference caused by the
radio system nearby. What is a common potential "fix" for the problem? - Answer-Add a
.01 μF capacitor across the motor/tachometer leads
A TDMA radio uses what to carry the multiple conversations sequentially? - Answer-
Separate time slots
The International Organization for Standardization has developed a seven-level
reference model for a packet-radio communications structure. The _______ level
arranges the bits into frames and controls data flow. - Answer-Link layer
What is a SDR? - Answer-Software Defined Radio
Maximum allowable frequency deviation for VHF marine radios is: - Answer-+/- 5 kHz
What type of wire connects an SSB automatic tuner to an insulated backstay? - Answer-
GTO-15 high-voltage cable
Which of the following statements concerning satellite EPIRBs is true - Answer-Once
activated, these EPIRBs transmit a signal for use in identifying the vessel and for
determining the position of the beacon.
What determines whether a NAVTEX receiver does not print a particular type of
message content? - Answer-The subject indicator matches that programmed for
rejection by the operator.
How should shielding be grounded on an NMEA 0183 data line? - Answer-Terminated
to ground at the talker and unterminated at the listener
What is the normal range of pulse repetition rates? - Answer-500 to 2,000 pps
What is the purpose of a synchro transmitter and receiver? - Answer-Transmits the
angular position of the antenna to the indicator unit.
When a RADAR is being operated on the 6 mile range setting what is the most
appropriate pulse width and pulse repetition rate? - Answer-0.25 s PW and 1,000 pps
QUESTIONS WITH ALL CORRECT
ANSWERS
What is the effective radiated power of a repeater with 100 watts transmitter power
output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? -
Answer-126 watts
The Distance Measuring Equipment (DME) measures the distance from the aircraft to
the DME ground station. This is referred to as: - Answer-The slant range
Lines drawn from the VOR station in a particular magnetic direction are: - Answer-
Radials
What is the frequency range of the localizer beam system used by aircraft to find the
centerline of a runway during an Instrument Landing System (ILS) approach to an
airport? - Answer-108.10 MHz to 111.95 MHz
What type of encoding is used in an aircraft's mode C transponder transmission to a
ground station of the Air Traffic Control RADAR Beacon System (ATCRBS)? - Answer-
Pulse position modulation
What type of antenna is attached to an aircraft's Mode C transponder installation and
used to receive 1030 MHz interrogation signals from the Air Traffic Control Radar
Beacon System (ATCRBS)? - Answer-An L-band monopole blade-type omnidirectional
antenna.
What is the function of a commercial aircraft's SELCAL installation? SELCAL is a type
of aircraft communications __________. - Answer-System where a ground-based
transmitter can call a selected aircraft or group of aircraft without the flight crew
monitoring the ground-station frequency
What is the purpose of a shunt resistor used with an ammeter? - Answer-It is used to
increase the ampere indicating range of the ammeter
Which of the following frequency standards is used as a time base standard by field
technicians? - Answer-Rubidium Standard
How does a spectrum analyzer differ from a conventional oscilloscope? - Answer-The
oscilloscope is used to display electrical signals in the time domain while the spectrum
analyzer is used to display electrical signals in the frequency domain.
What does the horizontal axis of a spectrum analyzer display? - Answer-Frequency
, What is the maximum FM deviation for voice operation of a normal wideband channel
on VHF and UHF? - Answer-5.0 kHz
Which of the following is the preferred method of cleaning solder from plated-through
circuit-board holes? - Answer-Use a vacuum device
What tolerance off of plumb should a single base station radio rack be installed? -
Answer-Just inside the bubble on a level
The tachometer of a building's elevator circuit experiences interference caused by the
radio system nearby. What is a common potential "fix" for the problem? - Answer-Add a
.01 μF capacitor across the motor/tachometer leads
A TDMA radio uses what to carry the multiple conversations sequentially? - Answer-
Separate time slots
The International Organization for Standardization has developed a seven-level
reference model for a packet-radio communications structure. The _______ level
arranges the bits into frames and controls data flow. - Answer-Link layer
What is a SDR? - Answer-Software Defined Radio
Maximum allowable frequency deviation for VHF marine radios is: - Answer-+/- 5 kHz
What type of wire connects an SSB automatic tuner to an insulated backstay? - Answer-
GTO-15 high-voltage cable
Which of the following statements concerning satellite EPIRBs is true - Answer-Once
activated, these EPIRBs transmit a signal for use in identifying the vessel and for
determining the position of the beacon.
What determines whether a NAVTEX receiver does not print a particular type of
message content? - Answer-The subject indicator matches that programmed for
rejection by the operator.
How should shielding be grounded on an NMEA 0183 data line? - Answer-Terminated
to ground at the talker and unterminated at the listener
What is the normal range of pulse repetition rates? - Answer-500 to 2,000 pps
What is the purpose of a synchro transmitter and receiver? - Answer-Transmits the
angular position of the antenna to the indicator unit.
When a RADAR is being operated on the 6 mile range setting what is the most
appropriate pulse width and pulse repetition rate? - Answer-0.25 s PW and 1,000 pps
