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General Class Exam Question Pool

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

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2015-G3B: Maximum Usable Frequency; Lowest Usable Frequency; propagation

2015-G3B01: How might a sky-wave signal sound if it arrives at your receiver by both short path and long path propagation?

A well-defined echo might be heard

Periodic fading approximately every 10 seconds

Signal strength increased by 3 dB

The signal might be cancelled causing severe attenuation



2015-G3B02: Which of the following is a good indicator of the possibility of sky-wave propagation on the 6-meter band?

Short skip sky-wave propagation on the 10-meter band

Long skip sky-wave propagation on the 10-meter band

Severe attenuation of signals on the 10-meter band

Long delayed echoes on the 10-meter band



2015-G3B03: Which of the following applies when selecting a frequency for lowest attenuation when transmitting on HF?

Select a frequency just below the MUF

Select a frequency just above the LUF

Select a frequency just below the critical frequency

Select a frequency just above the critical frequency



2015-G3B04: What is a reliable way to determine if the MUF is high enough to support skip propagation between your station and a distant location on frequencies between 14 and 30 MHz?

Listen for signals from an international beacon in the frequency range you plan to use

Send a series of dots on the band and listen for echoes from your signal

Check the strength of TV signals from Western Europe

Check the strength of signals in the MF AM broadcast band



2015-G3B05: What usually happens to radio waves with frequencies below the MUF and above the LUF when they are sent into the ionosphere?

They are bent back to the Earth

They pass through the ionosphere

They are amplified by interaction with the ionosphere

They are bent and trapped in the ionosphere to circle the Earth



2015-G3B06: What usually happens to radio waves with frequencies below the LUF?

They are completely absorbed by the ionosphere

They are bent back to the Earth

They pass through the ionosphere

They are bent and trapped in the ionosphere to circle the Earth



2015-G3B07: What does LUF stand for?

The Lowest Usable Frequency for communications between two points

The Longest Universal Function for communications between two points

The Lowest Usable Frequency during a 24 hour period

The Longest Universal Function during a 24 hour period



2015-G3B08: What does MUF stand for?

The Maximum Usable Frequency for communications between two points

The Minimum Usable Frequency for communications between two points

The Minimum Usable Frequency during a 24 hour period

The Maximum Usable Frequency during a 24 hour period



2015-G3B09: What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?

2,500 miles

180 miles

1,200 miles

12,000 miles



2015-G3B10: What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the E region?

1,200 miles

180 miles

2,500 miles

12,000 miles



2015-G3B11: What happens to HF propagation when the LUF exceeds the MUF?

No HF radio frequency will support ordinary sky-wave communications over the path

HF communications over the path are enhanced

Double hop propagation along the path is more common

Propagation over the path on all HF frequencies is enhanced



2015-G3B12: What factor or factors affect the MUF?

All of these choices are correct

Path distance and location

Time of day and season

Solar radiation and ionospheric disturbances





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2015-G3A: Sunspots and solar radiation; ionospheric disturbances; propagation forecasting and indices
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2015-G3C: Ionospheric layers; critical angle and frequency; HF scatter; Near Vertical Incidence Sky-wave
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