GROL TEST REVIEW EXAM QUESTIONS AND ANSWERS
A power transformer has a single primary winding and three secondary windings producing 5.0 volts,
12.6 volts, and 150 volts. Assuming similar wire sizes, which of the three secondary windings will have
the highest measured DC resistance? - CORRECT ANSWER✅✅The 150 volt winding.
In a linear electronic voltage regulator: - CORRECT ANSWER✅✅The conduction of a control element is
varied in direct proportion to the line voltage or load current
What are the characteristics of an inverting operational amplifier (op-amp) circuit? - CORRECT
ANSWER✅✅It has input and output signals 180 degrees out of phase
Which of the following instruments would be best for checking a TTL logic circuit? - CORRECT
ANSWER✅✅Logic Probe
What is the name of the semiconductor memory IC whose digital data can be written or read, and
whose memory word address can be accessed randomly? - CORRECT ANSWER✅✅RAM- Random-
Access Memory
Which type of oscillator circuit is commonly used in a VFO (varaiable frequency oscillator)? - CORRECT
ANSWER✅✅Colpitts
What is an undesirable effect of using too wide a filter bandwidth in the IF section of a reciever? -
CORRECT ANSWER✅✅Undesired signals will reach the audio stage.
What input-amplitude parameter is most valuable in evaluating the signal-handling capability of a Class
A amplifier? - CORRECT ANSWER✅✅Peak voltage
What is the deviation ration for an FM phone signal having a maximum frequency deviation of plus or
minus 5 kHz and accepting a maximum modulation rate of 3 kHz? - CORRECT ANSWER✅✅1.66
What does a two-tone illustrate on an oscilloscope? - CORRECT ANSWER✅✅Linearity of a SSB
transmitter.
,What is one way that voice is transmitted in a pulse-width modulation system? - CORRECT
ANSWER✅✅A standard pulse is varied in duration by an amount depending on the voice waveform at
that instant.
A 12.6-volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a RADAR
system that uses 300 watts. How long will the battery last? - CORRECT ANSWER✅✅17 minutes or 0.3
hours.
What happens to the bandwidth of an antenna as it is shortened through the use of loading coils? -
CORRECT ANSWER✅✅It is decreased.
If a transmission line has a power loss of 6 dB per 100 feet, what is the power at the feed point to the
antenna at the end of a 200-foot transmission line fed by a 100-watt transmitter? - CORRECT
ANSWER✅✅6 watts.
What is the effective radiated power of a repeater with 100 watts transmitter power output, 4 dB
feedline loss, 3 dB duplexer and circulator loss, and 7 dB antenna gain? - CORRECT ANSWER✅✅100
watts.
What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range
(VOR) aircraft navigational system? - CORRECT ANSWER✅✅A phase difference between two AC
voltages may be used to determine an aircraft's azimuth position in relation to a selected VOR station.
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)? - CORRECT
ANSWER✅✅An L-band monopole blade-type omnidirectional antenna.
Typical airborne HF transmitters usually provide a nominal RF power output to the antenna of ______
watts, compared with ________ watts RF output from a typical VHF transmitter. - CORRECT
ANSWER✅✅100,20
What is the purpose of a shunt resistor used with an ammeter? - CORRECT ANSWER✅✅It is used to
increase the ampere indicating range of the ammeter.
, What is used to decrease circuit loading when using an oscilloscope? - CORRECT ANSWER✅✅10:1
divider probe
What does the vertical axis of a spectrum analyzer display? - CORRECT ANSWER✅✅Amplitude
A "hot gas bonder" is used: - CORRECT ANSWER✅✅For non-contact melting of solder.
What tolerance off of plumb should a single base station radio rack be installed? - CORRECT
ANSWER✅✅Just inside the bubble on a level.
A TDMA radio uses what to carry the multiple conversations sequentially? - CORRECT
ANSWER✅✅Separate time slots.
Which is the code used for SITOR-A and -B transmissions? - CORRECT ANSWER✅✅Each character
consists of 7 bits with 4 "zeros" and 3 "ones".
Which of the following statements concerning SITOR communications is true? - CORRECT
ANSWER✅✅ARQ message transmissions are made in data groups consisting of three-character blocks.
What causes the SART to begin a transmission? - CORRECT ANSWER✅✅After being activated the SART
responds to RADAR interrogation.
What voltage drop at the end of the last segment will satisfy NMEA 2000 network cabling plans? -
CORRECT ANSWER✅✅1.5 volts
What is the purpose or function of the RADAR duplexer/circulator? It is a/an: - CORRECT
ANSWER✅✅Electronic switch that allows the use of one antenna for both transmission and reception.
What pulse width and repetition rate should you use at short ranges? - CORRECT ANSWER✅✅Narrow
pulse width and fast repetition rates.
A power transformer has a single primary winding and three secondary windings producing 5.0 volts,
12.6 volts, and 150 volts. Assuming similar wire sizes, which of the three secondary windings will have
the highest measured DC resistance? - CORRECT ANSWER✅✅The 150 volt winding.
In a linear electronic voltage regulator: - CORRECT ANSWER✅✅The conduction of a control element is
varied in direct proportion to the line voltage or load current
What are the characteristics of an inverting operational amplifier (op-amp) circuit? - CORRECT
ANSWER✅✅It has input and output signals 180 degrees out of phase
Which of the following instruments would be best for checking a TTL logic circuit? - CORRECT
ANSWER✅✅Logic Probe
What is the name of the semiconductor memory IC whose digital data can be written or read, and
whose memory word address can be accessed randomly? - CORRECT ANSWER✅✅RAM- Random-
Access Memory
Which type of oscillator circuit is commonly used in a VFO (varaiable frequency oscillator)? - CORRECT
ANSWER✅✅Colpitts
What is an undesirable effect of using too wide a filter bandwidth in the IF section of a reciever? -
CORRECT ANSWER✅✅Undesired signals will reach the audio stage.
What input-amplitude parameter is most valuable in evaluating the signal-handling capability of a Class
A amplifier? - CORRECT ANSWER✅✅Peak voltage
What is the deviation ration for an FM phone signal having a maximum frequency deviation of plus or
minus 5 kHz and accepting a maximum modulation rate of 3 kHz? - CORRECT ANSWER✅✅1.66
What does a two-tone illustrate on an oscilloscope? - CORRECT ANSWER✅✅Linearity of a SSB
transmitter.
,What is one way that voice is transmitted in a pulse-width modulation system? - CORRECT
ANSWER✅✅A standard pulse is varied in duration by an amount depending on the voice waveform at
that instant.
A 12.6-volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a RADAR
system that uses 300 watts. How long will the battery last? - CORRECT ANSWER✅✅17 minutes or 0.3
hours.
What happens to the bandwidth of an antenna as it is shortened through the use of loading coils? -
CORRECT ANSWER✅✅It is decreased.
If a transmission line has a power loss of 6 dB per 100 feet, what is the power at the feed point to the
antenna at the end of a 200-foot transmission line fed by a 100-watt transmitter? - CORRECT
ANSWER✅✅6 watts.
What is the effective radiated power of a repeater with 100 watts transmitter power output, 4 dB
feedline loss, 3 dB duplexer and circulator loss, and 7 dB antenna gain? - CORRECT ANSWER✅✅100
watts.
What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range
(VOR) aircraft navigational system? - CORRECT ANSWER✅✅A phase difference between two AC
voltages may be used to determine an aircraft's azimuth position in relation to a selected VOR station.
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)? - CORRECT
ANSWER✅✅An L-band monopole blade-type omnidirectional antenna.
Typical airborne HF transmitters usually provide a nominal RF power output to the antenna of ______
watts, compared with ________ watts RF output from a typical VHF transmitter. - CORRECT
ANSWER✅✅100,20
What is the purpose of a shunt resistor used with an ammeter? - CORRECT ANSWER✅✅It is used to
increase the ampere indicating range of the ammeter.
, What is used to decrease circuit loading when using an oscilloscope? - CORRECT ANSWER✅✅10:1
divider probe
What does the vertical axis of a spectrum analyzer display? - CORRECT ANSWER✅✅Amplitude
A "hot gas bonder" is used: - CORRECT ANSWER✅✅For non-contact melting of solder.
What tolerance off of plumb should a single base station radio rack be installed? - CORRECT
ANSWER✅✅Just inside the bubble on a level.
A TDMA radio uses what to carry the multiple conversations sequentially? - CORRECT
ANSWER✅✅Separate time slots.
Which is the code used for SITOR-A and -B transmissions? - CORRECT ANSWER✅✅Each character
consists of 7 bits with 4 "zeros" and 3 "ones".
Which of the following statements concerning SITOR communications is true? - CORRECT
ANSWER✅✅ARQ message transmissions are made in data groups consisting of three-character blocks.
What causes the SART to begin a transmission? - CORRECT ANSWER✅✅After being activated the SART
responds to RADAR interrogation.
What voltage drop at the end of the last segment will satisfy NMEA 2000 network cabling plans? -
CORRECT ANSWER✅✅1.5 volts
What is the purpose or function of the RADAR duplexer/circulator? It is a/an: - CORRECT
ANSWER✅✅Electronic switch that allows the use of one antenna for both transmission and reception.
What pulse width and repetition rate should you use at short ranges? - CORRECT ANSWER✅✅Narrow
pulse width and fast repetition rates.
