HAM FREE Ham Radio Extra Class Questions and Answers 2

Question 1

What is the purpose of a Smith chart in amateur radio?

Accepted Answer

To graphically represent complex impedance and solve transmission line problems

Answer

To calculate antenna gain in dBi

Answer

To map propagation paths across the ionosphere

Answer

To determine the legal power limits for Extra class operators

Question 2

Which emission type designator represents a single-sideband suppressed-carrier voice signal?

Accepted Answer

J3E

Answer

F3E

Answer

A1A

Answer

C3F

Question 3

What is the maximum symbol rate permitted for RTTY or data emission on the 20-meter band for Extra class licensees?

Accepted Answer

300 baud

Answer

1200 baud

Answer

19.6 kilobaud

Answer

56 kilobaud

Question 4

What happens to the noise figure of a receiver when a lossy component is placed before the first amplifier stage?

Accepted Answer

The noise figure degrades by approximately the loss of the component

Answer

The noise figure improves proportionally

Answer

The noise figure remains unchanged

Answer

The noise figure is cut in half

Question 5

In a phase-locked loop (PLL) circuit, what is the function of the voltage-controlled oscillator (VCO)?

Accepted Answer

To generate an output frequency that varies with the applied control voltage

Answer

To filter out harmonics from the reference oscillator

Answer

To divide the output frequency for the phase detector

Answer

To convert digital signals to analog for modulation

Question 6

What is the primary advantage of using a Beverage antenna for receiving on the low HF bands?

Accepted Answer

Very high directivity and low-angle reception with excellent noise rejection

Answer

Extremely high transmit gain

Answer

Compact size suitable for portable operation

Answer

Circular polarization for satellite work