# Extra Class Exam Question Pool

effective 7/01/2008 thru 6/30/2012

 Show: Unseen questions Weak questions Review questions Learned questions Incorrect answer choices

E8A: AC waveforms: sine, square, sawtooth and irregular waveforms; AC measurements; average and PEP of RF signals; pulse and digital signal waveforms

E8A01: What type of wave is made up of a sine wave plus all of its odd harmonics?

A square wave

A sine wave

A cosine wave

A tangent wave

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

E8A03: What type of wave is made up of sine waves of a given fundamental frequency plus all its harmonics?

A sawtooth wave

A square wave

A sine wave

A cosine wave

E8A04: What is the equivalent to the root-mean-square value of an AC voltage?

The DC voltage causing the same amount of heating in a resistor as the corresponding RMS AC voltage

The AC voltage found by taking the square of the average value of the peak AC voltage

The DC voltage causing the same amount of heating in a given resistor as the corresponding peak AC voltage

The AC voltage found by taking the square root of the average AC value

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 wavemeter

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

2.5 to 1

25 to 1

1 to 1

100 to 1

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

E8A08: What is the period of a wave?

The time required to complete one cycle

The number of degrees in one cycle

The number of zero crossings in one cycle

The amplitude of the wave

E8A09: What type of waveform is produced by human speech?

Irregular

Sinusoidal

Logarithmic

Trapezoidal

E8A10: Which of the following is a distinguishing characteristic of a pulse waveform?

Narrow bursts of energy separated by periods of no signal

Regular sinusoidal oscillations

A series of tones that vary between two frequencies

A signal that contains three or more discrete tones

E8A11: What is one use for a pulse modulated signal?

Digital data transmission

Linear amplification

PSK31 data transmission

Multiphase power transmission

E8A12: What type of information can be conveyed using digital waveforms?

All of these answers are correct

Human speech

Video signals

Data

E8A13: 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 answers are correct

E8A14: Which of these methods is commonly used to convert analog signals to digital signals?

Sequential sampling

Harmonic regeneration

Level shifting

Phase reversal

E8A15: What would the waveform of a digital data stream signal look like on a conventional oscilloscope?

A series of pulses with varying patterns

A series of sine waves with evenly spaced gaps

A running display of alpha-numeric characters

None of the above; this type of signal cannot be seen on a conventional oscilloscope

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