increases the input and output impedances
increases the input impedance and bandwidth
decreases the output impedance and bandwidth
does not affect impedance or bandwidthAns : 2

15. A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is ………

100,000
1000
101
100Ans : 3

16. If the feedback resistor in Q15 (above question) is open, the voltage gain …….

increases
decreases
is not affected
depends on RiAns : 1

17. A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain ……..

doubles
drops to 12.5
remains at 25
increases slightlyAns : 3

18. A voltage follower ……….

has a voltage gain of 1
is noninverting
has no feedback resistor
has all of theseAns : 4