26. For audio systems, the reference level is generally accepted as ________.
(a) 1 mW
(b) 1 W
(c) 10 mW
(d) 100 mW
27. The magnitude of the third harmonic is ________ of the magnitude of the fundamental.
(a) 1
(b) 0.5
(c) 0.33
(d) 0.25
28. The ________ region produces the maximum voltage gain in a single-stage BJT or FET amplifier.
(a) low-frequency
(b) mid-frequency
(c) high-frequency
(d) None of the above
29. The resistance associated with the 1-mW power level is ________ , chosen because it is the characteristic impedance of audio transmission lines.
(a) 100
(b) 250
(c) 400
(d) 600
30. To fix the frequency boundaries of relatively high gain, ________ was chosen to be the gain at the cutoff levels.
(a) 0.5Av mid
(b) 0.707Av mid
(c) Av low
(d) 0.5Av high
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