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Electronics
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Operational Amplifiers
Comments
Question
When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
Options
A. open- or closed-loop gain
B. integration or differentiation
C. saturation or cutoff
D. addition or subtraction
Correct Answer
integration or differentiation
Operational Amplifiers problems
Search Results
1. If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?
Options
A. 6240 ohms
B. 2.4 kilohms
C. 410 ohms
D. 0.62 kilohms
Show Answer
Scratch Pad
Discuss
Correct Answer: 6240 ohms
2. What is the frequency of this 555 astable multivibrator?
Options
A. 278 Hz
B. 178 Hz
C. 78 Hz
D. 8 Hz
Show Answer
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Discuss
Correct Answer: 178 Hz
3. What is this circuit?
Options
A. a low-pass filter
B. a high-pass filter
C. a bandpass filter
D. a band-stop filter
Show Answer
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Discuss
Correct Answer: a band-stop filter
4. With negative feedback, the returning signal
Options
A. is proportional to the output current
B. is proportional to the differential voltage gain
C. opposes the input signal
D. aids the input signal
Show Answer
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Discuss
Correct Answer: opposes the input signal
5. The input offset current equals the
Options
A. average of two base currents
B. collector current divided by the current gain
C. difference between two base-emitter voltages
D. difference between two base currents
Show Answer
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Discuss
Correct Answer: difference between two base currents
6. An output that is proportional to the addition of two or more inputs is from which type of amplifier?
Options
A. differentiator
B. difference
C. summing
D. analog subtractor
Show Answer
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Discuss
Correct Answer: summing
7. The magnitude of closed-loop voltage gain (
A
cl
) of an inverting amplifier equals:
Options
A. the ratio of the input resistance to the feedback resistance
B. the open-loop voltage gain
A
ol
C. the feedback resistance divided by the input resistance
D. the input resistance
Show Answer
Scratch Pad
Discuss
Correct Answer: the feedback resistance divided by the input resistance
8. What is the output waveform?
Options
A. sine wave
B. square wave
C. +15 V
D. ?15 V
Show Answer
Scratch Pad
Discuss
Correct Answer: sine wave
9. What starts a free-running multivibrator?
Options
A. a trigger
B. an input signal
C. an external circuit
D. nothing
Show Answer
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Discuss
Correct Answer: nothing
10. The closed-loop voltage gain of an inverting amplifier equals:
Options
A. the ratio of the input resistance to the feedback resistance
B. the open-loop voltage gain
C. the feedback resistance divided by the input resistance
D. the input resistance
Show Answer
Scratch Pad
Discuss
Correct Answer: the feedback resistance divided by the input resistance
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