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Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

    Unseen questions
    Weak questions
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    Incorrect answer choices  

T3C-2014: Propagation modes: line of sight; sporadic E; meteor and auroral scatter and reflections; tropospheric ducting; F layer skip; radio horizon

T3C01-2014: Why are direct (not via a repeater) UHF signals rarely heard from stations outside your local coverage area?

UHF signals are usually not reflected by the ionosphere

They are too weak to go very far

FCC regulations prohibit them from going more than 50 miles

They collide with trees and shrubbery and fade out

T3C02-2014: Which of the following might be happening when VHF signals are being received from long distances?

Signals are being refracted from a sporadic E layer

Signals are being reflected from outer space

Signals are arriving by sub-surface ducting

Signals are being reflected by lightning storms in your area

T3C03-2014: What is a characteristic of VHF signals received via auroral reflection?

The signals exhibit rapid fluctuations of strength and often sound distorted

Signals from distances of 10,000 or more miles are common

These types of signals occur only during winter nighttime hours

These types of signals are generally strongest when your antenna is aimed west

T3C04-2014: Which of the following propagation types is most commonly associated with occasional strong over-the-horizon signals on the 10, 6, and 2 meter bands?

Sporadic E


D layer absorption

Gray-line propagation

T3C05-2014: Which of the following effects might cause radio signals to be heard despite obstructions between the transmitting and receiving stations?

Knife-edge diffraction

Faraday rotation

Quantum tunneling

Doppler shift

T3C06-2014: What mode is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?

Tropospheric scatter

D layer refraction

F2 layer refraction

Faraday rotation

T3C07-2014: What band is best suited for communicating via meteor scatter?

6 meters

10 meters

2 meters

70 cm

T3C08-2014: What causes tropospheric ducting?

Temperature inversions in the atmosphere

Discharges of lightning during electrical storms

Sunspots and solar flares

Updrafts from hurricanes and tornadoes

T3C09-2014: What is generally the best time for long-distance 10 meter band propagation via the F layer?

From dawn to shortly after sunset during periods of high sunspot activity

From shortly after sunset to dawn during periods of high sunspot activity

From dawn to shortly after sunset during periods of low sunspot activity

From shortly after sunset to dawn during periods of low sunspot activity

T3C10-2014: What is the radio horizon?

The distance over which two stations can communicate by direct path

The distance from the ground to a horizontally mounted antenna

The farthest point you can see when standing at the base of your antenna tower

The shortest distance between two points on the Earth's surface

T3C11-2014: Why do VHF and UHF radio signals usually travel somewhat farther than the visual line of sight distance between two stations?

The Earth seems less curved to radio waves than to light

Radio signals move somewhat faster than the speed of light

Radio waves are not blocked by dust particles

Radio waves are blocked by dust particles

T3C12-2014: Which of the following bands may provide long distance communications during the peak of the sunspot cycle?

Six or ten meters

23 centimeters

70 centimeters or 1.25 meters

All of these choices are correct

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Previous group:
T3B-2014: Radio and electromagnetic wave properties: the electromagnetic spectrum; wavelength vs. frequency; velocity of electromagnetic waves; calculating wavelength
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Technician Class Exam Question Pool
Next group:
T4A-2014: Station setup: connecting microphones; reducing unwanted emissions; power source; connecting a computer; RF grounding; connecting digital equipment; connecting an SWR meter
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