CBT Broadcast Transmission and Equipment — Questions and Answers
Question 1: Which type of modulation is most commonly used in FM broadcasting?
- Amplitude Modulation
- Pulse Modulation
- Frequency Modulation (Correct answer)
- Phase Modulation
Correct answer: Frequency Modulation
FM broadcasting uses frequency modulation, where the frequency of the carrier signal varies with the amplitude of the input signal.
Question 2: What does ERP stand for in broadcasting?
- Electric Radio Power
- Effective Radiated Power (Correct answer)
- Energy Reflection Parameter
- Electronic Range Profile
Correct answer: Effective Radiated Power
ERP stands for Effective Radiated Power, which is the amount of power a transmitter appears to radiate when antenna gain is considered.
Question 3: What component is used to match the impedance between a transmitter and an antenna?
- Antenna tuner (Correct answer)
- Low-pass filter
- Amplifier
- Modulator
Correct answer: Antenna tuner
A transmission line or matching network ensures maximum power transfer by matching the impedance of the transmitter to the antenna.
Question 4: Which frequency band is typically used for FM radio broadcasting in the U.S.?
- 300 MHz - 400 MHz
- 54 MHz - 88 MHz
- 88 MHz - 108 MHz (Correct answer)
- 3 MHz - 30 MHz
Correct answer: 88 MHz - 108 MHz
The FM broadcast band in the United States ranges from 88 MHz to 108 MHz.
Question 5: What is the function of a broadcast transmitter?
- Record program content
- Generate and amplify RF signals (Correct answer)
- Modulate video signals only
- Control lighting in studios
Correct answer: Generate and amplify RF signals
A transmitter generates and amplifies RF signals that carry audio or video content to an antenna for broadcast.
Question 6: What is the purpose of a directional antenna in broadcasting?
- Prevent all signal loss
- Receive only satellite signals
- Radiate signal equally in all directions
- Concentrate signal in a desired direction (Correct answer)
Correct answer: Concentrate signal in a desired direction
Directional antennas focus the signal in specific directions to increase range or minimize interference.
CBT Broadcast Transmission and Equipment
Which type of modulation is most commonly used in FM broadcasting?