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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

    Unseen questions
    Weak questions
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    Incorrect answer choices  

2016-E3A: Electromagnetic waves; Earth-Moon-Earth communications; meteor scatter; microwave tropospheric and scatter propagation; aurora propagation

2016-E3A01: What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?

12,000 miles, if the Moon is visible by both stations

500 miles, if the Moon is at perigee

2000 miles, if the Moon is at apogee

5000 miles, if the Moon is at perigee

2016-E3A02: What characterizes libration fading of an EME signal?

A fluttery irregular fading

A slow change in the pitch of the CW signal

A gradual loss of signal as the Sun rises

The returning echo is several Hertz lower in frequency than the transmitted signal

2016-E3A03: When scheduling EME contacts, which of these conditions will generally result in the least path loss?

When the Moon is at perigee

When the Moon is full

When the Moon is at apogee

When the MUF is above 30 MHz

2016-E3A04: What do Hepburn maps predict?

Probability of tropospheric propagation

Sporadic E propagation

Locations of auroral reflecting zones

Likelihood of rain-scatter along cold or warm fronts

2016-E3A05: Tropospheric propagation of microwave signals often occurs along what weather related structure?

Warm and cold fronts


Lightning discharges

Sprites and jets

2016-E3A06: Which of the following is required for microwave propagation via rain scatter?

The rain must be within radio range of both stations

Rain droplets must be electrically charged

Rain droplets must be within the E layer

All of these choices are correct

2016-E3A07: Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

Bodies of water

Mountain ranges


Urban areas

2016-E3A08: When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?

The E layer

The F1 layer

The F2 layer

The D layer

2016-E3A09: Which of the following frequency range is most suited for meteor scatter communications?

28 MHz - 148 MHz

1.8 MHz - 1.9 MHz

10 MHz - 14 MHz

220 MHz - 450 MHz

2016-E3A10: Which type of atmospheric structure can create a path for microwave propagation?

Temperature inversion

The jet stream

Wind shear

Dust devil

2016-E3A11: What is a typical range for tropospheric propagation of microwave signals?

100 miles to 300 miles

10 miles to 50 miles

1200 miles

2500 miles

2016-E3A12: What is the cause of auroral activity?

The interaction in the E layer of charged particles from the Sun with the Earth's magnetic field

The interaction in the F2 layer between the solar wind and the Van Allen belt

A low sunspot level combined with tropospheric ducting

Meteor showers concentrated in the extreme northern and southern latitudes

2016-E3A13: Which emission mode is best for aurora propagation?





2016-E3A14: From the contiguous 48 states, in which approximate direction should an antenna be pointed to take maximum advantage of aurora propagation?





2016-E3A15: What is an electromagnetic wave?

A wave consisting of an electric field and a magnetic field oscillating at right angles to each other

A wave of alternating current, in the core of an electromagnet

A wave consisting of two electric fields at parallel right angles to each other

A wave consisting of two magnetic fields at right angles to each other

2016-E3A16: Which of the following best describes electromagnetic waves traveling in free space?

Changing electric and magnetic fields propagate the energy

Electric and magnetic fields become aligned as they travel

The energy propagates through a medium with a high refractive index

The waves are reflected by the ionosphere and return to their source

2016-E3A17: What is meant by circularly polarized electromagnetic waves?

Waves with a rotating electric field

Waves with an electric field bent into a circular shape

Waves that circle the Earth

Waves produced by a loop antenna

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2016-E2E: Operating methods: operating HF digital modes
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2016-E3B: Transequatorial propagation; long path; gray-line; multi-path; ordinary and extraordinary waves; chordal hop, sporadic E mechanisms
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