Free Ham Radio Extra Class Questions and Answers

Question 1

Which ionospheric layer is the nearest to Earth's surface?

Accepted Answer

The D layer

Answer

The F1 layer

Answer

The F2 layer

Answer

The E layer

Question 2

What benefit does employing a ferrite core toroidal inductor provide?

Accepted Answer

All of the above

Answer

Most of the magnetic field is contained in the core

Answer

Large values of inductance may be obtained

Answer

The magnetic properties of the core may be optimized for a specific range of frequencies

Question 3

In a 146.52 MHz FM phone transmitter with a 5 kHz dispersion, what is the frequency deviation for a 12.21 MHz reactance modulated oscillator?

Accepted Answer

416.7 Hz

Answer

5 kHz

Answer

60 kHz

Answer

101.75 HZ

Question 4

If an oscilloscope records 200 volts peak-to-peak across a 50 ohm dummy load attached to the transmitter output, what is the output PEP from the transmitter?

Accepted Answer

100 watts

Answer

353.5 watts

Answer

400 watts

Answer

1.4 watts

Question 5

What is a 22,000 picofarad (pF) capacitor's value in nanofarads (nF)?

Accepted Answer

22

Answer

220

Answer

2.2

Answer

0.22

Question 6

How do the gains for the same antenna expressed in dBi and dBd compare?

Accepted Answer

dBi gain figures are 2.15 dB higher than dBd gain figures

Answer

dBi gain figures are the reciprocal of dBd gain figures +2.15 dB

Answer

dBi gain figures are 2.15 dB lower than dBd gain figures

Answer

dBi gain figures are the same as the square root of dBd gain figures multiplied by 2.15

Question 7

What benefit does an oscilloscope have over a digital voltmeter, specifically?

Accepted Answer

Complex waveforms can be measured

Answer

Input impedance is much lower

Answer

An oscilloscope uses less power

Answer

Complex impedances can be easily measured