13. The signal-to-noise ratio limits the maximum sensitivity of a radio receiver.
The signal-to-noise ratio is a number that represents the ratio of the input signal
a. external noise created by atmospherics.
c. internal noise caused by thermal agitation of components.
d. total noise that appears with the signal in the useful frequency band.
14. On the front panel of most communication radio receivers are found controls
for tuning, output volume, sensitivity, and bandwidth.
The control that is most
effective in improving the signal-to-noise ratio is the control that adjusts
d. output volume.
15. Interference between receivers located in the same area becomes a possibility
if the local oscillator signals of the receivers are radiated by the antennas.
d. using an efficient antenna-coupling device to reduce signal loss.
CHECK YOUR ANSWERS WITH LESSON SOLUTIONS ON PAGE 49.