In each of the following exercises, select the ONE answer that BEST completes the statement or answers the
question. Indicate your solution by circling the letter opposite the correct answer in the subcourse booklet.
a. a keyer.
c. an amplifier.
b. a modulator.
2. When a radio operator opens and closes his telegraph key, the result of his action is to
a. turn the radio wave on and off.
c. feed line power into the power supply.
d. add power to the continuously radiated RF signal.
3. The primary function of a radio transmitting antenna is to
a. limit the transmission of radio signals to one radio receiving station.
b. increase the range of the radio communication system.
c. reradiate the received signals.
d. radiate electromagnetic waves.
4. The sequence of processing a radio wave in a radio receiver is
a. signal selection, RF amplification, detection, AF amplification.
b. RF amplification, signal selection, detection, AF amplification.
c. signal selection, detection, RF amplification, AF amplification.
d. detection, RF amplification, signal selection, AF amplification.
5. An unmodulated radio wave is characterized by the fact that it
a. sends out coded signals.