South Carolina Broadcast Systems
Installer Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary function of an RF
spectrum analyzer in broadcast system installation?
A. To amplify weak signals for improved transmission
B. To measure and display the amplitude of signals versus frequency **
C. To encode audio for digital broadcast formats
D. To regulate power supplied to transmission equipment
A spectrum analyzer is used to observe signal amplitudes across a
range of frequencies, which is critical for identifying interference and
tuning broadcast systems.
2. What is the standard impedance for most coaxial transmission lines
used in television broadcast systems?
A. 50 ohms
B. 75 ohms **
C. 100 ohms
D. 300 ohms
Broadcast coaxial cables typically have a 75-ohm characteristic
impedance to match broadcast equipment and minimize signal
reflections.
,3. Which modulation scheme is most commonly used for FM radio
broadcast transmissions?
A. Amplitude Modulation (AM)
B. Frequency Modulation (FM) **
C. Phase Modulation (PM)
D. Pulse Width Modulation (PWM)
Frequency modulation is used in FM broadcasting to provide
improved audio fidelity and resistance to noise.
4. In a broadcast transmitter system, what is the purpose of the dummy
load?
A. To increase antenna gain
B. To safely dissipate RF energy when the antenna is disconnected **
C. To filter out spurious emissions
D. To amplify the output signal
A dummy load absorbs the transmitter’s RF output without radiating,
protecting the transmitter during testing or when the antenna is
offline.
5. Which of the following best defines VSWR (Voltage Standing Wave
Ratio)?
A. The ratio of forward power to reflected power **
B. The difference between modulation depth and carrier frequency
C. The total harmonic distortion of an RF signal
D. The synchronization rate of digital broadcast clocks
VSWR indicates how efficiently RF power is transmitted from a source
through a transmission line to the load.
6. What is the National Television System Committee (NTSC) standard
used for?
A. FM radio only
B. Digital television encoding
, C. Analog television broadcasting in the U.S. **
D. Satellite uplink frequency coordination
NTSC refers to the analog TV standard historically used in the United
States for color television signals.
7. Which safety protocol is critical when working on transmitting
antennas at height?
A. Wearing RF shielding clothing
B. Using fall protection and approved climbing gear **
C. Operating only during daylight hours
D. Ensuring the transmitter is powered on to lock out equipment
Fall protection and proper climbing equipment are essential to
prevent serious injury when working at elevated antenna sites.
8. What frequency range is commonly assigned for UHF television
broadcasts?
A. 30–300 MHz
B. 300–3000 MHz
C. 300–890 MHz **
D. 890–1500 MHz
UHF broadcast television operates in the hundreds of MHz range,
generally between 300 MHz and 890 MHz.
9. Which component is used to prevent reflected power from damaging
a transmitter?
A. Band-pass filter
B. Circulator **
C. Antenna tuner
D. Attenuator
A circulator directs reflected power away from the transmitter into a
termination, safeguarding equipment.
Installer Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary function of an RF
spectrum analyzer in broadcast system installation?
A. To amplify weak signals for improved transmission
B. To measure and display the amplitude of signals versus frequency **
C. To encode audio for digital broadcast formats
D. To regulate power supplied to transmission equipment
A spectrum analyzer is used to observe signal amplitudes across a
range of frequencies, which is critical for identifying interference and
tuning broadcast systems.
2. What is the standard impedance for most coaxial transmission lines
used in television broadcast systems?
A. 50 ohms
B. 75 ohms **
C. 100 ohms
D. 300 ohms
Broadcast coaxial cables typically have a 75-ohm characteristic
impedance to match broadcast equipment and minimize signal
reflections.
,3. Which modulation scheme is most commonly used for FM radio
broadcast transmissions?
A. Amplitude Modulation (AM)
B. Frequency Modulation (FM) **
C. Phase Modulation (PM)
D. Pulse Width Modulation (PWM)
Frequency modulation is used in FM broadcasting to provide
improved audio fidelity and resistance to noise.
4. In a broadcast transmitter system, what is the purpose of the dummy
load?
A. To increase antenna gain
B. To safely dissipate RF energy when the antenna is disconnected **
C. To filter out spurious emissions
D. To amplify the output signal
A dummy load absorbs the transmitter’s RF output without radiating,
protecting the transmitter during testing or when the antenna is
offline.
5. Which of the following best defines VSWR (Voltage Standing Wave
Ratio)?
A. The ratio of forward power to reflected power **
B. The difference between modulation depth and carrier frequency
C. The total harmonic distortion of an RF signal
D. The synchronization rate of digital broadcast clocks
VSWR indicates how efficiently RF power is transmitted from a source
through a transmission line to the load.
6. What is the National Television System Committee (NTSC) standard
used for?
A. FM radio only
B. Digital television encoding
, C. Analog television broadcasting in the U.S. **
D. Satellite uplink frequency coordination
NTSC refers to the analog TV standard historically used in the United
States for color television signals.
7. Which safety protocol is critical when working on transmitting
antennas at height?
A. Wearing RF shielding clothing
B. Using fall protection and approved climbing gear **
C. Operating only during daylight hours
D. Ensuring the transmitter is powered on to lock out equipment
Fall protection and proper climbing equipment are essential to
prevent serious injury when working at elevated antenna sites.
8. What frequency range is commonly assigned for UHF television
broadcasts?
A. 30–300 MHz
B. 300–3000 MHz
C. 300–890 MHz **
D. 890–1500 MHz
UHF broadcast television operates in the hundreds of MHz range,
generally between 300 MHz and 890 MHz.
9. Which component is used to prevent reflected power from damaging
a transmitter?
A. Band-pass filter
B. Circulator **
C. Antenna tuner
D. Attenuator
A circulator directs reflected power away from the transmitter into a
termination, safeguarding equipment.
