46. A comparator is an example of a(n)
(a) active filter
(b) current source
(c) linear circuit
(d) nonlinear circuit
47. If the input to a comparator is a sine wave, the output is a
(a) ramp voltage
(b) sine wave
(c) rectangular wave
(d) sawtooth wave
48. The ______________ input makes the summing amplifier circuit possible.
(a) virtual ground at the noninverting
(b) virtual ground at the inverting
(c) low-voltage
(d) high-voltage
49. A Wien-bridge oscillator uses _________.
(a) positive feedback
(b) negative feedback
(c) both types of feedback
(d) an LC tank circuit
50. Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.
(a) does not change
(b) doubles for every 1 kHz increase in frequency
(c) increases
(d) decreases
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