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General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G3A: Sunspots and solar radiation; ionospheric disturbances; propagation forecasting and indices

2015-G3A01: What is the significance of the sunspot number with regard to HF propagation?

Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies

Lower sunspot numbers generally indicate greater probability of sporadic E propagation

A zero sunspot number indicate radio propagation is not possible on any band

All of these choices are correct.

2015-G3A02: What effect does a Sudden Ionospheric Disturbance have on the daytime ionospheric propagation of HF radio waves?

It disrupts signals on lower frequencies more than those on higher frequencies

It enhances propagation on all HF frequencies

It disrupts communications via satellite more than direct communications

None, because only areas on the night side of the Earth are affected

2015-G3A03: Approximately how long does it take the increased ultraviolet and X-ray radiation from solar flares to affect radio propagation on the Earth?

8 minutes

28 days

1 to 2 hours

20 to 40 hours

2015-G3A04: Which of the following are least reliable for long distance communications during periods of low solar activity?

15 meters, 12 meters and 10 meters

80 meters and 160 meters

60 meters and 40 meters

30 meters and 20 meters

2015-G3A05: What is the solar flux index?

A measure of solar radiation at 10.7 centimeters wavelength

A measure of the highest frequency that is useful for ionospheric propagation between two points on the Earth

A count of sunspots which is adjusted for solar emissions

Another name for the American sunspot number

2015-G3A06: What is a geomagnetic storm?

A temporary disturbance in the Earth's magnetosphere

A sudden drop in the solar flux index

A thunderstorm which affects radio propagation

Ripples in the ionosphere

2015-G3A07: At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?

At any point in the solar cycle

At the summer solstice

Only at the maximum point of the solar cycle

Only at the minimum point of the solar cycle

2015-G3A08: Which of the following effects can a geomagnetic storm have on radio propagation?

Degraded high-latitude HF propagation

Improved high-latitude HF propagation

Improved ground-wave propagation

Improved chances of UHF ducting

2015-G3A09: What effect does a high sunspot number have on radio communications?

Long-distance communication in the upper HF and lower VHF range is enhanced

High-frequency radio signals become weak and distorted

Frequencies above 300 MHz become usable for long-distance communication

Microwave communications become unstable

2015-G3A10: What causes HF propagation conditions to vary periodically in a 28 day cycle?

The Sun’s rotation on its axis

Long term oscillations in the upper atmosphere

Cyclic variation in the Earth’s radiation belts

The position of the Moon in its orbit

2015-G3A11: Approximately how long is the typical sunspot cycle?

11 years

8 minutes

40 hours

28 days

2015-G3A12: What does the K-index indicate?

The short term stability of the Earth’s magnetic field

The relative position of sunspots on the surface of the Sun

The stability of the Sun’s magnetic field

The solar radio flux at Boulder, Colorado

2015-G3A13: What does the A-index indicate?

The long term stability of the Earth’s geomagnetic field

The relative position of sunspots on the surface of the Sun

The amount of polarization of the Sun’s electric field

The solar radio flux at Boulder, Colorado

2015-G3A14: How are radio communications usually affected by the charged particles that reach the Earth from solar coronal holes?

HF communications are disturbed

HF communications are improved

VHF/UHF ducting is improved

VHF/UHF ducting is disturbed

2015-G3A15: How long does it take charged particles from coronal mass ejections to affect radio propagation on the Earth?

20 to 40 hours

28 days

14 days

4 to 8 minutes

2015-G3A16: What is a possible benefit to radio communications resulting from periods of high geomagnetic activity?

Auroras that can reflect VHF signals

Higher signal strength for HF signals passing through the polar regions

Improved HF long path propagation

Reduced long delayed echoes

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