1         Which of the following statements are true?

a)       In order to transport information, radio waves are being modulated.

b)       FM or frequency modulation is mostly used for shortwave broadcast.

c)       VHF antennas can be built much smaller than shortwave antennas.

d)       For transmission of voice, the strength (amplitude) or the frequency of the radio waves changes in the rhythm of the sound waves.

2        Which of the following factors determine the range of a  local VHF or UHF radio link?

a)       The efficiency of the antenna

b)       The topography of the terrain

c)       The conditions in the upper atmosphere

d)       All of the above

3        Which of the following equipment is indispensable to establish any radio network?

a)       A repeater station

b)       A satellite

c)       A power source

d)       A laptop computer

4        When the word "roger" is used on a radio link, it means

a)       The operator is looking for someone called "Roger"

b)       I hear you and have understood your message

c)       Please transmit now

d)       I have not understood your message