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1. 
Modulation is...
A.
necessary to carry a signal.
B.
a technique to transmit an electromagnetic signal using a carrier signal.
C.
a technique to show an electromagnetic signal inside a carrier signal.
D.
a diagram of an electromagnetic signal, a modulator and a carrier signal.
2. 
A modulator is...
A.
a device to convert a signal into a carrier wave.
B.
an electric device to convert a modulating wave in a modulating wave.
C.
an electronic device used to join a modulating wave with a carrier wave, giving as result a high frequency modulating wave.
D.
a diagram that shows how the modulating wave join to a carrier wave.
3. 
Bandwith of a signal is...
A.
twice the frequency of the modulating signal. 2*Fm
B.
twice the upper sideband frequency. 2*Fh
C.
the addition of the upper sideband frequency and the lower sideband frequency. Fh+Fl
D.
the difference between the upper sideband frequency and the lower sideband frequency. Fh-Fl
4. 
AM modulation...
A.
is the oldest type of modulation.
B.
is used for communication between planes and air traffic control towers.
C.
has a complex construction.
D.
requires satelletital equipment and terrestrial repeaters.
5. 
FM modulation...
6. 
FM modulation...
7. 
FM modulation...
8. 
FM modulation...
9. 
FM modulation...
10. 
FM modulation...
A.
travels only to into outer space.
B.
requieres ground repeaters for communication satellites.
C.
is preferred for commercial radio listeners due to the quality of the audio signal.
D.
has constant the amplitude value and the frequency varies.
11. 
FM modulation...
12. 
Digital modulation...
A.
works with digital signals transmitted by a computer system.
B.
works with analogue signal transmitted by an antenne.
C.
is the most used modulation type nowadays.
D.
is the less used modulation type nowadays.
13. 
The types of digital modulation are...
A.
Amplitude Shif Keying and Frequency Shift Keying.
B.
Phase Shift Keying and Frequency Shift Keying.
C.
Phase Shift Keying, Amplitude Shift Keying and Frequency Shift Keying.
D.
Phase Shift Keying and Amplitude Shift Keying.