FCC Commercial Element 3 pool, section 30

Subelement D

Circuits

Section 30

Op Amps

330D1

What is the main advantage of using an op-amp audio filter over a passive LC audio filter?

A.
Op-amps are largely immune to vibration and temperature change.
B.
Most LC filter manufacturers have retooled to make op-amp filters.
C.
Op-amps are readily available in a wide variety of operational voltages and frequency ranges.
Correct Answer
D.
Op-amps exhibit gain rather than insertion loss.

330D1

What is the main advantage of using an op-amp audio filter over a passive LC audio filter?

Op-amps exhibit gain rather than insertion loss.

These devices tend not to be affected by temperature changes or vibrations.

Please see SpringerLink site for the series of article on filters, called Active Filter Design.

View YouTube video from the Electronics with Professor Fiore channel called Op Amps: Active Filters Intro

For a detailed explanation, please see the MVCC EDU site for the pdf document Operational Amplifiers & Linear Integrated Circuits: Theory and Application by James M. Fiore. Use CTRL-F, and search on the word "gain."

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330D2

What are the characteristics of an inverting operational amplifier (op-amp) circuit?

A.
It has input and output signals in phase.
B.
Input and output signals are 90 degrees out of phase.
Correct Answer
C.
It has input and output signals 180 degrees out of phase.
D.
Input impedance is low while the output impedance is high.

330D2

What are the characteristics of an inverting operational amplifier (op-amp) circuit?

It has input and output signals 180 degrees out of phase.

From the Tutorials Point site for the article Inverting and Non-Inverting Operational Amplifiers

"In the inverting operational amplifier circuit, the signal is applied at the inverting input and the non-inverting input is connected to the ground. In this type of amplifier, the output is 180⁰ out of phase to the input, i.e. when positive signal is applied to circuit, the output of the circuit will be negative."

See Electronics Tutorials site for the article Inverting Operational Amplifier

Also, see Circuit Digest site for the article Inverting Operational Amplifier

For more information, please see the Electrical 4 U site for the article Op Amp Characteristics

See Wikipedia's article on Operational amplifier

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330D3

Gain of a closed-loop op-amp circuit is determined by?

A.
The maximum operating frequency divided by the square root of the load impedance.
Correct Answer
B.
The op-amp’s external feedback network.
C.
Supply voltage and slew rate.
D.
The op-amp’s internal feedback network.

330D3

Gain of a closed-loop op-amp circuit is determined by?

The op-amp’s external feedback network.

For more information, please see the Electrical 4 U site for the article Op Amp Characteristics

See Wikipedia's article on Operational amplifier

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330D4

Where is the external feedback network connected to control the gain of a closed-loop op-amp circuit?

A.
Between the differential inputs.
B.
From output to the non-inverting input.
Correct Answer
C.
From output to the inverting input.
D.
Between the output and the differential inputs.

330D4

Where is the external feedback network connected to control the gain of a closed-loop op-amp circuit?

From output to the inverting input.

From the Tutorials Point site for the article Inverting and Non-Inverting Operational Amplifiers

"In the inverting operational amplifier circuit, the signal is applied at the inverting input and the non-inverting input is connected to the ground. In this type of amplifier, the output is 180⁰ out of phase to the input, i.e. when positive signal is applied to circuit, the output of the circuit will be negative."

See Electronics Tutorials site for the article Inverting Operational Amplifier

Also, see Circuit Digest site for the article Inverting Operational Amplifier

For more information, please see the Electrical 4 U site for the article Op Amp Characteristics

See Wikipedia's article on Operational amplifier

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330D5

Which of the following op-amp circuits is operated open-loop?

A.
Non-inverting amp.er.
B.
Inverting amp.
C.
Active filt
Correct Answer
D.
Comparator.

330D5

Which of the following op-amp circuits is operated open-loop?

Comparator.

Regarding the comparator, please see Electronics Tutorials site for the article on Op-amp Comparator

For more information, please see the Electrical 4 U site for the article Op Amp Characteristics

See Wikipedia's article on Operational amplifier

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330D6

In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled?

Correct Answer
A.
Frequency would be lower.
B.
Frequency would be higher.
C.
There would be no change. The inputs are reversed, therefore the circuit cannot function.
D.
None of the above.

330D6

In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled?

Frequency would be lower.

For more information, please see the Electrical 4 U site for the article Op Amp Characteristics

See Wikipedia's article on Operational amplifier

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