36. The reference voltage for the comparator in the given circuit equals ______.
(a) 0 V
(b) +8.8 V
(c) +16 V
(d) +7.2 V
37. The rate of change of the output voltage in the given circuit equals ______.
(a) 40 mV/s
(b) 5 V/s
(c) 0 V/s
(d) 40 V/s
38. In the given circuit, VIN1 equals ______.
(a) +4 V
(b) +20 V
(c) –4 V
(d) –20 V
39. In the given circuit, if Rf is reduced to 8 k, the circuit becomes the ______.
(a) digital-to-analog converter
(b) averaging amplifier
(c) scaling adder
(d) summing amplifier with gain greater than unity
40. In an averaging amplifier, the input resistances are
(a) equal to the feedback resistance
(b) less than the feedback resistance
(c) greater than the feedback resistance
(d) unequal
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