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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E7G: Active filters and op-amp circuits: active audio filters; characteristics; basic circuit design; operational amplifiers

2016-E7G01: What is the typical output impedance of an integrated circuit op-amp?

Very low

Very high

100 ohms

1000 ohms

2016-E7G02: What is the effect of ringing in a filter?

Undesired oscillations added to the desired signal

An echo caused by a long time delay

A reduction in high frequency response

Partial cancellation of the signal over a range of frequencies

2016-E7G03: What is the typical input impedance of an integrated circuit op-amp?

Very high

100 ohms

1000 ohms

Very low

2016-E7G04: What is meant by the term op-amp input offset voltage?

The differential input voltage needed to bring the open loop output voltage to zero

The output voltage of the op-amp minus its input voltage

The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage

The potential between the amplifier input terminals of the op-amp in an open loop condition

2016-E7G05: How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?

Restrict both gain and Q

Restrict gain but increase Q

Restrict Q but increase gain

Increase both gain and Q

2016-E7G06: Which of the following is the most appropriate use of an op-amp active filter?

As an audio filter in a receiver

As a high-pass filter used to block RFI at the input to receivers

As a low-pass filter used between a transmitter and a transmission line

For smoothing power supply output

2016-E7G07: What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?





2016-E7G08: How does the gain of an ideal operational amplifier vary with frequency?

It does not vary with frequency

It increases linearly with increasing frequency

It decreases linearly with increasing frequency

It decreases logarithmically with increasing frequency

2016-E7G09: What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

-2.3 volts

0.23 volts

2.3 volts

-0.23 volts

2016-E7G10: What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?





2016-E7G11: What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?





2016-E7G12: What is an integrated circuit operational amplifier?

A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance

A digital audio amplifier whose characteristics are determined by components external to the amplifier

An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit

A RF amplifier used in the UHF and microwave regions

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2016-E7F: DSP filtering and other operations; Software Defined Radio Fundamentals; DSP modulation and demodulation
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2016-E7H: Oscillators and signal sources: types of oscillators; synthesizers and phase-locked loops; direct digital synthesizers; stabilizing thermal drift; microphonics; high accuracy oscillators
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