36. Calculate the cutoff frequencies of a bandpass filter with R1 = R2 = 5 k and C1 = C2 = 0.1 F.
(a) fOL = 318.3 Hz, fOH = 318.3 Hz
(b) fOL = 636.6 Hz, fOH = 636.6 Hz
(c) fOL = 318.3 Hz, fOH = 636.6 Hz
(d) fOL = 636.6 Hz, fOH = 318.3 Hz
37. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5 k and C1 = 0.05 F.
(a) 1.273 kHz
(b) 12.73 kHz
(c) 127.3 kHz
(d) 127.30 Hz
38. The output voltage of a voltage buffer is ________ with the input voltage.
(a) in phase
(b) 45º out of phase
(c) 90º out of phase
(d) 180º out of phase
39. Op-amp circuits are used in ________ voltmeters.
(a) only dc
(b) only ac
(c) both ac and dc
(d) neither ac nor dc
40. In a millivoltmeter, the diodes and the capacitor are used in ________ parts of the circuit.
(a) the dc
(b) the ac
(c) both the dc and ac
(d) neither the dc nor ac
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