FCC Technician Class Exam Study Guide - 2014-2018/Subelement T8 Group A

Modulation modes: bandwidth of various signals; choice of emission type

Question 1

 * Which of the following is a form of amplitude modulation?
 * A. Spread-spectrum
 * B. Packet radio
 * C. Single sideband
 * D. Phase shift keying

The correct answer is C.

Question 2

 * What type of modulation is most commonly used for VHF packet radio transmissions?
 * A. FM
 * B. SSB
 * C. AM
 * D. Spread Spectrum

The correct answer is A.

Question 3

 * Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands?
 * A. FM
 * B. DRM
 * C. SSB
 * D. PM

The correct answer is C.

Question 4

 * Which type of modulation is most commonly used for VHF and UHF voice repeaters?
 * A. AM
 * B. SSB
 * C. PSK
 * D. FM

The correct answer is D.

Question 5

 * Which of the following types of emission has the narrowest bandwidth?
 * A. FM voice
 * B. SSB voice
 * C. CW
 * D. Slow-scan TV

The correct answer is C.

Question 6

 * Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?
 * A. Upper sideband
 * B. Lower sideband
 * C. Suppressed sideband
 * D. Inverted sideband

The correct answer is A.

Question 7

 * What is the primary advantage of single sideband over FM for voice transmissions?
 * A. SSB signals are easier to tune
 * B. SSB signals are less susceptible to interference
 * C. SSB signals have narrower bandwidth
 * D. All of these choices are correct

The correct answer is C.

Question 8

 * What is the approximate bandwidth of a single sideband voice signal?
 * A. 1 kHz
 * B. 3 kHz
 * C. 6 kHz
 * D. 15 kHz

The correct answer is B.

Question 9

 * What is the approximate bandwidth of a VHF repeater FM phone signal?
 * A. Less than 500 Hz
 * B. About 150 kHz
 * C. Between 10 and 15 kHz
 * D. Between 50 and 125 kHz

The correct answer is C.

Question 10

 * What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?
 * A. More than 10 MHz
 * B. About 6 MHz
 * C. About 3 MHz
 * D. About 1 MHz

The correct answer is B.

Question 11

 * What is the approximate maximum bandwidth required to transmit a CW signal?
 * A. 2.4 kHz
 * B. 150 Hz
 * C. 1000 Hz
 * D. 15 kHz

The correct answer is B.