10. Of the values listed, the most realistic value for open-loop gain of an op-amp is (b) 2000 (c) 80 dB (d) 100,000 (a) 1 f 60 The i
10. Of the values listed, the most realistic value for open-loop gain of an op-amp is (b) 2000 (c) 80 dB (d) 100,000 (a) 1 f 60 The i
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter18: Resistive-inductive Parallel Circuits
Section: Chapter Questions
Problem 13PP: In an R-L parallel circuit, IT=1.25 amps, R=1.2k, and XL=1k. Find IR
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Transcribed Image Text:Q\ Solve the following questions while giving the reason for each point
10. Of the values listed, the most realistic value for open-loop gain of an op-amp is
(a) 1 (b) 2000 (c) 80 dB (d) 100,000
11. A certain op-amp has bias currents of 50 µA and 49.3 µA. The input offset current is
(a) 700 na (b) 99.3 µA
(c) 49.7 µA
(d) none of these
12. The output of a particular op-amp increases 8 V in 12 us. The slew rate is
(a) 96 V/us (b) 0.67 V/us
(c) 1.5 V/us
(d) none of these
13. The purpose of offset nulling is to
(a) reduce the gain
(b) equalize the input signals
(c) zero the output error voltage
(d) answers (b) and (c)
14. The use of negative feedback
(a) reduces the voltage gain of an op-amp (b) makes the op-amp oscillate
(e) makes linear operation possible
(d) answers (a) and (c)
15. For an op-amp with negative feedback, the output is
(a) equal to the input
(b) increased
(c) fed back to the inverting input
(d) fed back to the noninverting input
16. A certain noninverting amplifier has an R, of 1.0 kl and an Rof 100 kfN. The closed-loop
gain is
(a) 100,000 (b) 1000
(c) 101
(d) 100
17. If the feedback resistor in Question 16 is open, the voltage gain
(a) increases
(b) decreases (e) is not affected
(d) depends on R;
18. A certain inverting amplifier has a closed-loop gain of 25. The op-amp has an open-loop gain
of 100,000. If another op-amp with an open-loop gain of 200,000 is substituted in the configu-
ration, the closed-loop gain
(a) doubles
(b) drops to 12.5 (c) remains at 25
(d) increases slightly
19. A voltage-follower
(a) has a gain of 1
(b) is noninverting
(c) has no feedback resistor
(d) has all of these
20. Negative feedback
(a) increases the input and output impedances
(b) increases the input impedance and the bandwidth
(c) decreases the output impedance and the bandwidth
(d) does not affect impedances or bandwidth
21. Bias current compensation
(a) reduces gain
(c) increases bandwidth
22. The midrange open-loop gain of an op-amp
(b) reduces output error voltage
(d) has no effect
(a) extends from the lower critical frequency to the upper critical frequency
(b) extends from 0 Hz to the upper critical frequency
(e) rolls off at 20 dB/decade beginning at 0 Hz
(d) answers (b) and (c)
23. The frequency at which the open-loop gain is equal to 1 is called
(b) the cutoff frequency
(a) the upper critical frequency
(e) the notch frequency
(d) the unity-gain frequency
24. Phase shift through an op-amp is caused by
(a) the internal RC circuits
(b) the external RC circuits
(c) the gain roll-off
(d) negative feedback
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ISBN:
9781337900348
Author:
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Publisher:
Cengage Learning