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NEW Extra Class Exam Question Pool

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

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2016-E8A: AC waveforms: sine, square, sawtooth and irregular waveforms; AC measurements; average and PEP of RF signals; Fourier analysis; Analog to digital conversion: Digital to Analog conversion

2016-E8A01: What is the name of the process that shows that a square wave is made up of a sine wave plus all of its odd harmonics?

Fourier analysis

Vector analysis

Numerical analysis

Differential analysis

2016-E8A02: What type of wave has a rise time significantly faster than its fall time (or vice versa)?

A sawtooth wave

A cosine wave

A square wave

A sine wave

2016-E8A03: What type of wave does a Fourier analysis show to be made up of sine waves of a given fundamental frequency plus all of its harmonics?

A sawtooth wave

A square wave

A sine wave

A cosine wave

2016-E8A04: What is "dither" with respect to analog to digital converters?

A small amount of noise added to the input signal to allow more precise representation of a signal over time

An abnormal condition where the converter cannot settle on a value to represent the signal

An error caused by irregular quantization step size

A method of decimation by randomly skipping samples

2016-E8A05: What would be the most accurate way of measuring the RMS voltage of a complex waveform?

By measuring the heating effect in a known resistor

By using a grid dip meter

By measuring the voltage with a D'Arsonval meter

By using an absorption wave meter

2016-E8A06: What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?

2.5 to 1

25 to 1

1 to 1

100 to 1

2016-E8A07: What determines the PEP-to-average power ratio of a single-sideband phone signal?

The characteristics of the modulating signal

The frequency of the modulating signal

The degree of carrier suppression

The amplifier gain

2016-E8A08: Why would a direct or flash conversion analog-to-digital converter be useful for a software defined radio?

Very high speed allows digitizing high frequencies

Very low power consumption decreases frequency drift

Immunity to out of sequence coding reduces spurious responses

All of these choices are correct

2016-E8A09: How many levels can an analog-to-digital converter with 8 bit resolution encode?



8 multiplied by the gain of the input amplifier

256 divided by the gain of the input amplifier

2016-E8A10: What is the purpose of a low pass filter used in conjunction with a digital-to-analog converter?

Remove harmonics from the output caused by the discrete analog levels generated

Lower the input bandwidth to increase the effective resolution

Improve accuracy by removing out of sequence codes from the input

All of these choices are correct

2016-E8A11: What type of information can be conveyed using digital waveforms?

All of these choices are correct

Human speech

Video signals


2016-E8A12: What is an advantage of using digital signals instead of analog signals to convey the same information?

Digital signals can be regenerated multiple times without error

Less complex circuitry is required for digital signal generation and detection

Digital signals always occupy a narrower bandwidth

All of these choices are correct

2016-E8A13: Which of these methods is commonly used to convert analog signals to digital signals?

Sequential sampling

Harmonic regeneration

Level shifting

Phase reversal

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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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2016-E8B: Modulation and demodulation: modulation methods; modulation index and deviation ratio; frequency and time division multiplexing; Orthogonal Frequency Division Multiplexing
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