GCT 1 Practice UPDATED ACTUAL Exam
Questions and CORRECT Answers
What are three of the most important parameters of an antenna? - CORRECT ANSWER -
Polarization, bandwidth, beamwidth
What is the principle called when the antenna performs best at a certain frequency? - CORRECT
ANSWER - Resonance
How is gain achieved on an antenna? - CORRECT ANSWER - By redirecting the signal from
non-useful directions to more useful directions
What is antenna downtilt, and when should it be applied? - CORRECT ANSWER -
Mechanically or electrically directing signal downward; used when an antenna's radiating signal
overshoots a desired coverage area
How is directivity derived on a Yagi antenna? - CORRECT ANSWER - By adding two or
more elements at specific spacing
What is meant by maximum rated power and attenuation on a transmission line? - CORRECT
ANSWER - Maximum RF power the transmission line can handle & RF signal loss as RF
power travels along the transmission line (dB per 100ft)
What is the characteristic impedance of a radio transmission line? - CORRECT ANSWER -
50 ohms
What is the name of an omnidirectional antenna on a vehicle? - CORRECT ANSWER - Whip
antenna
What is the predominant antenna polarization of land mobile radios? - CORRECT
ANSWER - Vertical
,If the frequency goes up, will the wavelength go up or down? - CORRECT ANSWER - Down
With respect to an antenna, what is meant by bandwidth? - CORRECT ANSWER - Range of
frequencies from lowest to highest where it produces acceptable performance
Below 900 MHz, what is the gain on an antenna referenced against? - CORRECT ANSWER -
Dipole
What is the best method to measure the match of an antenna system? - CORRECT
ANSWER - Return loss measurement
What does the term "loss per 100 feet" refer to? - CORRECT ANSWER - Attenuation (in dB)
of a RF transmission line
What two parameters must be checked before installing an antenna and transmission line on a
tower? - CORRECT ANSWER - Total weight and surface load of the transmission line and
antenna
Name at least five parameters that must be considered when selecting a transmission line. -
CORRECT ANSWER - Transmitter power, frequency, line length, weight, diameter of the
line, jacket materials, fire rating, signal loss, shielding percentage, bending radius
What is the purpose of the RS232 standard? - CORRECT ANSWER - Allow devices from
competing manufacturers to interface with each other
What is the voltage range for a one or true RS232 value? - CORRECT ANSWER - -3 to -
15VDC
What is the common name of the 9-pin connector for RS232? - CORRECT ANSWER - DB9
, What does the abbreviation DTE stand for? - CORRECT ANSWER - Data Terminal
Equipment
What is an example of a DTE device? - CORRECT ANSWER - Computer
What COM ports are most often used by legacy programs? - CORRECT ANSWER -
COMM1 thru COMM4
What is the voltage range of a zero or false RS232 value? - CORRECT ANSWER - +3 to
+15VDC
What does the abbreviation DCE stand for? - CORRECT ANSWER - Data Communication
Equipment
What is an example of a DCE device? - CORRECT ANSWER - Modem
The internet uses what interface standard? - CORRECT ANSWER - IP (Internet Protocol)
What is the basic wireless, data network standard created by the IEEE? - CORRECT
ANSWER - 802.11
What is the typical cable used for an Ethernet connection? - CORRECT ANSWER - CAT5,
CAT5e, or CAT6
What does the abbreviation WLAN stand for? - CORRECT ANSWER - Wireless Local Area
Network
What type of cable is used to swap transmit and receive pairs? - CORRECT ANSWER - Null
modem cable
Questions and CORRECT Answers
What are three of the most important parameters of an antenna? - CORRECT ANSWER -
Polarization, bandwidth, beamwidth
What is the principle called when the antenna performs best at a certain frequency? - CORRECT
ANSWER - Resonance
How is gain achieved on an antenna? - CORRECT ANSWER - By redirecting the signal from
non-useful directions to more useful directions
What is antenna downtilt, and when should it be applied? - CORRECT ANSWER -
Mechanically or electrically directing signal downward; used when an antenna's radiating signal
overshoots a desired coverage area
How is directivity derived on a Yagi antenna? - CORRECT ANSWER - By adding two or
more elements at specific spacing
What is meant by maximum rated power and attenuation on a transmission line? - CORRECT
ANSWER - Maximum RF power the transmission line can handle & RF signal loss as RF
power travels along the transmission line (dB per 100ft)
What is the characteristic impedance of a radio transmission line? - CORRECT ANSWER -
50 ohms
What is the name of an omnidirectional antenna on a vehicle? - CORRECT ANSWER - Whip
antenna
What is the predominant antenna polarization of land mobile radios? - CORRECT
ANSWER - Vertical
,If the frequency goes up, will the wavelength go up or down? - CORRECT ANSWER - Down
With respect to an antenna, what is meant by bandwidth? - CORRECT ANSWER - Range of
frequencies from lowest to highest where it produces acceptable performance
Below 900 MHz, what is the gain on an antenna referenced against? - CORRECT ANSWER -
Dipole
What is the best method to measure the match of an antenna system? - CORRECT
ANSWER - Return loss measurement
What does the term "loss per 100 feet" refer to? - CORRECT ANSWER - Attenuation (in dB)
of a RF transmission line
What two parameters must be checked before installing an antenna and transmission line on a
tower? - CORRECT ANSWER - Total weight and surface load of the transmission line and
antenna
Name at least five parameters that must be considered when selecting a transmission line. -
CORRECT ANSWER - Transmitter power, frequency, line length, weight, diameter of the
line, jacket materials, fire rating, signal loss, shielding percentage, bending radius
What is the purpose of the RS232 standard? - CORRECT ANSWER - Allow devices from
competing manufacturers to interface with each other
What is the voltage range for a one or true RS232 value? - CORRECT ANSWER - -3 to -
15VDC
What is the common name of the 9-pin connector for RS232? - CORRECT ANSWER - DB9
, What does the abbreviation DTE stand for? - CORRECT ANSWER - Data Terminal
Equipment
What is an example of a DTE device? - CORRECT ANSWER - Computer
What COM ports are most often used by legacy programs? - CORRECT ANSWER -
COMM1 thru COMM4
What is the voltage range of a zero or false RS232 value? - CORRECT ANSWER - +3 to
+15VDC
What does the abbreviation DCE stand for? - CORRECT ANSWER - Data Communication
Equipment
What is an example of a DCE device? - CORRECT ANSWER - Modem
The internet uses what interface standard? - CORRECT ANSWER - IP (Internet Protocol)
What is the basic wireless, data network standard created by the IEEE? - CORRECT
ANSWER - 802.11
What is the typical cable used for an Ethernet connection? - CORRECT ANSWER - CAT5,
CAT5e, or CAT6
What does the abbreviation WLAN stand for? - CORRECT ANSWER - Wireless Local Area
Network
What type of cable is used to swap transmit and receive pairs? - CORRECT ANSWER - Null
modem cable
