Home Chapter 25 Multiple Choice

# Multiple Choice

This activity contains 20 questions.

## A source voltage is expressed as: e = 12 + 4 sin 3t. What is the dc component?

 4 V 16 V 3 V 12 V

## What is the dc term of the Fourier series?

 the zero-volt crossing value the maximum value of a cycle the minimum value of a cycle the average value of the waveform over one full cycle

## You are measuring a square wave entering and leaving a low-pass filter, and you notice that the rise time and fall time have increased after the filter. Why?

 The lower-frequency harmonics are not passed through the filter. The fundamental is not passed through the filter. The higher-frequency harmonics are not passed through the filter. The even harmonics are not passed through the filter.

## What are the restrictions on the sine and cosine terms of a Fourier series?

 The frequencies of sine and cosine terms must be an integer multiple of the fundamental. The Fourier series must have either sine or cosine terms, but not both. The frequencies of sine and cosine terms must be random. Sine and cosine terms must be of less magnitude than the fundamental.

## How many terms are required to give a good approximation of a square wave?

 the first harmonic the fundamental harmonics up to and including the tenth harmonics up to and including the ninth

## If the fundamental frequency is 8 MHz, what is the ninth harmonic?

 17 MHz 1.125 MHz 72 MHz 1 MHz

## A Fourier series refers to a series of terms used to represent a nonsinusoidal periodic waveform. Of what terms is the series comprised?

 the average value plus the sum of sine and cosine terms the difference between sine and cosine terms the sum of sine and cosine terms the product of sine and cosine terms

## The Fourier series representation of a nonsinusoidal input can be applied to a linear network using what theorem?

 superposition maximum power Norton's Thévenin's

## The Fourier series of a square wave has "ripple." What does the number of peaks represent?

 the period of the fundamental the even harmonics the number of terms included the number of harmonics

## Under what condition can the Fourier series expression for the waveform resulting from the addition or subtraction of two nonsinusoidal waveforms be found using phasor algebra?

 The terms having the same frequency are considered separately. All of the terms are cosine terms. The terms do not have the same frequency. All of the terms are sine terms.

## Specify the symmetry of the following signal.

 half-wave even none odd

## Specify the symmetry of the following signal.

 odd half-wave even none

## What is the fundamental frequency of the signal in Problem 11?

 1000 Hz 2000 Hz 250 Hz 500 Hz

## What is the period of the signal in Problem 12?

 8 s 4 s 10 s 6 s

## What is the average value of the signal in Problem 12?

 4 V 8 V 2 V 0 V

## What is the average value of the following signal?

 0.75 V 1.5 V 1.25 V 2.0 V

## What is the symmetry of the signal in Problem 16?

 even half-wave none odd

## Which Fourier terms will be present in the signal of Problem 11?

 sine only cosine only both sine and cosine only odd harmonics

## Which Fourier terms will be present in the signal of Problem 16?

 cosine only sine only only odd harmonics sine and cosine

## Which Fourier terms will be present in the signal of Problem 12?

 sine only cosine only only even harmonics only odd harmonics