FCC Technician Class Exam Study Guide - 2014-2018/Subelement T7 Group A

Station equipment: receivers; transmitters; transceivers; modulation; transverters; low power and weak signal operation; transmit and receive amplifiers The Question Pool Question 1 Which term describes the ability of a receiver to detect the presence of a signal? A. Linearity B. Sensitivity C. Selectivity D. Total Harmonic Distortion The correct answer is B. Question 2 What is a transceiver? A. A type of antenna switch B. A unit combining the functions of a transmitter and a receiver C. A component in a repeater which filters out unwanted interference D. A type of antenna matching network The correct answer is B. Question 3 Which of the following is used to convert a radio signal from one frequency to another? A. Phase splitter B. Mixer C. Inverter D. Amplifier The correct answer is B. Question 4 Which term describes the ability of a receiver to discriminate between multiple signals? A. Discrimination ratio B. Sensitivity C. Selectivity D. Harmonic Distortion The correct answer is C. Question 5 What is the name of a circuit that generates a signal of a desired frequency? A. Reactance modulator B. Product detector C. Low-pass filter D. Oscillator The correct answer is D. Question 6 What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal? A. High-pass filter B. Low-pass filter C. Transverter D. Phase converter The correct answer is C. Question 7 What is meant by term “PTT”? A. Pre-transmission tuning to reduce transmitter harmonic emission B. Precise tone transmissions used to limit repeater access to only certain signals C. A primary transformer tuner use to match antennas D. The push to talk function which switches between receive and transmit The correct answer is D. Question 8 Which of the following describes combining speech with an RF carrier signal?- A. Impedance matching B. Oscillation C. Modulation D. Low-pass filtering The correct answer is C. Question 9 Which of the following devices is most useful for VHF weak-signal communication? A. A quarter-wave vertical antenna B. A multi-mode VHF transceiver C. An omni-directional antenna D. A mobile VHF FM transceiver The correct answer is B. Question 10 What device increases the low-power output from a handheld transceiver? A. A voltage divider B. An RF power amplifier C. An impedance network D. All of these choices are correct The correct answer is B. Question 11 Where is a RF preamplifier installed? A. Between the antenna and receiver B. At the output of the transmitter's power amplifier C. Between a transmitter and antenna tuner D. At the receiver's audio output The correct answer is A.