4. For maximum transfer of power between stages, the output impedance of the
first stage must be matched to the input impedance of the second.
method that best can match the high impedance of a power amplifier to the low
impedance of a loudspeaker voice coil is
b. impedance coupling.
fidelity is to be expected.
This type of distortion is produced in an audio
a. negative feedback is permitted to occur.
b. the amplification of each input frequency is not uniform.
c. the amplitudes of different signal frequencies vary in the output.
d. certain additional frequencies, not present in the original input signal,
6. The most important consideration in voice communication is that the receiver
a. high fidelity.
b. good intelligibility.
c. high harmonic content.
7. The reason that harmonic distortion more seriously affects the quality of an
a. attenuates frequencies on either side of the 150-to 3,500-Hz band.
b. minimizes the sum and difference frequencies that improve speech quality.
c. introduces new frequencies that were not originally present in the signal.
d. cancels out the intermodulation products that produce intelligible speech.
improving the amplifier's stability.
The function of a negative feedback circuit
a. equals the output signal voltage.
b. opposes the applied input signal voltage.