26. An amplifier has an input signal voltage of 0.054 mV. The output voltage is 12.5 V. The voltage gain in dB is
(a) 53.6 dB.
(b) 107.3 dB.
(c) 226 dB.
(d) 116 dB.
27. A certain amplifier has a bandwidth of 22.5 kHz with a lower cutoff frequency of 600 Hz. What is the value of fcu?
(a) 600 Hz
(b) 22.5 kHz
(c) 23.1 kHz
(d) 21.9 kHz
28. The frequency response of an amplifier can be determined using the step response method, and measuring the output rise/fall times between
(a) 0% and 100% response.
(b) 10% and 90% response.
(c) 25% and 75% response.
(d) five time constant responses.
29. For low-frequency response, all RC circuits in an amplifier may not have the same critical frequency. Which RC response will determine the critical frequency of the amplifier?
(a) the lowest frequency
(b) the center frequency
(c) the highest frequency
(d) the bypass frequency
30. In a multistage amplifier, the overall frequency response is determined by the
(a) frequency response of each stage depending on the relationships of the critical frequencies.
(b) frequency response of the first amplifier.
(c) frequency response of the last amplifier.
(d) lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier.
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