161. If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?
(a) 3.5 mV
(b) ground
(c) 1.42 mV
(d) 0.56 mV
162. If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will:
(a) not need an input resistor
(b) be virtual ground
(c) have high reverse current
(d) not invert the signal
163. What is the frequency of this 555 astable multivibrator?
(a) 278 Hz
(b) 178 Hz
(c) 78 Hz
(d) 8 Hz
164. How many logic states does an S-R flip-flop have?
(a) 2
(b) 3
(c) 4
(d) 5
165. What is the output waveform?
(a) sine wave
(b) square wave
(c) +15 V
(d) –15 V
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