HAM - Radio Extra Class Test Radio Extra Class General 1

Question 1

What is the lowest frequency on the 40-meter band on which an Amateur Extra class licensee may operate SSB voice?

Accepted Answer

7.125 MHz

Answer

7.000 MHz

Answer

7.025 MHz

Answer

7.175 MHz

Question 2

Which mode of propagation is responsible for extending 2-meter VHF signals over 1,000 miles or more during periods of stable high-pressure weather systems?

Accepted Answer

Tropospheric ducting

Answer

Sporadic E

Answer

Meteor scatter

Answer

Transequatorial propagation

Question 3

What is the approximate symbol rate of a PSK31 digital mode signal?

Accepted Answer

31.25 baud

Answer

12.5 baud

Answer

300 baud

Answer

1200 baud

Question 4

How does the radiation resistance of a folded dipole compare to that of a standard half-wave dipole?

Accepted Answer

It is four times as high, approximately 292 ohms

Answer

It is one-quarter as high, approximately 18 ohms

Answer

It is the same, approximately 73 ohms

Answer

It is twice as high, approximately 146 ohms

Question 5

What is the primary purpose of a key-click filter in a CW transmitter?

Accepted Answer

To smooth the rise and fall times of keyed pulses, reducing occupied bandwidth

Answer

To increase output power during keying

Answer

To lock the oscillator frequency during keying transients

Answer

To sharpen keying edges for maximum code readability

Question 6

What two factors primarily determine the Maximum Usable Frequency (MUF) for a specific ionospheric propagation path?

Accepted Answer

The critical frequency of the ionospheric layer and the angle of wave incidence

Answer

Transmitter power and antenna height above ground

Answer

Solar flux index and geomagnetic K-index only

Answer

Time of day and geographic distance between stations