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General Class Exam Question Pool

effective 7/01/2011 thru 6/30/2015

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G3B-2011: Maximum Usable Frequency; Lowest Usable Frequency; propagation

G3B01-2011: 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



G3B02-2011: 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



G3B03-2011: 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



G3B04-2011: What is a reliable way to determine if the Maximum Usable Frequency (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

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



G3B05-2011: What usually happens to radio waves with frequencies below the Maximum Usable Frequency (MUF) and above the Lowest Usable Frequency (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



G3B06-2011: What usually happens to radio waves with frequencies below the Lowest Usable Frequency (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



G3B07-2011: 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



G3B08-2011: 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



G3B09-2011: 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



G3B10-2011: 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



G3B11-2011: What happens to HF propagation when the Lowest Usable Frequency (LUF) exceeds the Maximum Usable Frequency (MUF)?

No HF radio frequency will support ordinary skywave 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



G3B12-2011: What factors affect the Maximum Usable Frequency (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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G3A-2011: Sunspots and solar radiation; ionospheric disturbances; propagation forecasting and indices
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General Class Exam Question Pool
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G3C-2011: Ionospheric layers; critical angle and frequency; HF scatter; Near Vertical Incidence Sky waves
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