821. Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________?
A. 1
B. 2000
C. 80 dB
D. 100,000

822. Current cannot flow to ground through _______________?
A. a mechanical ground
B. an a.c. ground
C. a virtual ground
D. an ordinary ground

823. The input stage of an Op-amp is usually a ________________?
A. differential amplifier
B. class B push-pull amplifier
C. CE amplifier
D. swamped amplifier

824. A common-mode signal is applied to ________________?
A. the noninverting input
B. the inverting input
C. both iputs
D. top of the tail resisto

825. The tail current in a differential amplifier equals ______________?
A. difference between two emitter currents
B. sum of two emitter currents
C. collector current divided by current gain
D. collector voltage divided by collector resistance

826. The input offset current equals the_____________?
A. difference between two base currents
B. average of two base currents
C. collector current divided by current gain
D. none of these

827. A voltage follower _____________?
A. has a voltage gain of 1
B. is noninverting
C. has no feedback resistor
D. has all of these

828. If the feedback resistor in Q15 (above question) is open, the voltage gain ____________?
A. increases
B. decreases
C. is not affected
D. depends on Ri

829. A certain OP-amp has bias currents of 50 µA. The input offset current is_________________?
A. 700 nA
B. 99.3 µA
C. 49.7 µA
D. none of these

830. The use of negative feedback ________________?
A. reduces the voltage gain of an Op-amp
B. makes the Op-amp oscillate
C. makes linear operation possible
D. answers (A) and (B)

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