# Kennedy: MCQs in Introduction to Communication Systems

(Last Updated On: December 8, 2017)

This is the Multiple Choice Questions in Chapter 1: Introduction to Communication Systems from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. In a communications system, noise is most likely to affect the signal

• a. at the transmitter
• b. in the channel
• c. in the information source
• d. at the destination

2. Indicate the false statement. Fourier analysis shows that a sawtooth  wave consist of

• a. fundamental and subharmonic sine waves
• b. a fundamental sine wave and an infinite number of harmonics
• c. fundamental and harmonic sine waves whose amplitude decreases with the harmonic number
• d. sinusoidal voltages, some of which are small enough to ignore in practice

3. Indicate the false statement. Modulation is used to

• a. reduce the bandwidth used
• b. separate differing transmissions
• c. ensure that intelligence may be transmitted over long distances
• d. allow the use of practicable antennas

4. Indicate the false statement. From the transmitter the signal deterioration because of noise is usually

• a. unwanted energy
• b. predictable in character
• c. present in the transmitter
• d. due to any cause

5. Indicate the true statement. Most receivers conforms to the

• a. amplitude-modulated group
• b. frequency-modulated gr
• c. superheterodyne group

6. Indicate the false statement. The need for modulation can best be exemplified by the following.

• a. Antenna lengths will be approximately λ/4 long
• b. An antenna in the standard broadcast AM band is 16,000 ft
• c. All sound is concentrated from 20 Hz to 20 kHz
• d. A message is composed of unpredictable variations in both amplitude and frequency

7. Indicate the true statement. The process of sending and receiving started as early as

• a. the middle 1930s
• b. 1850
• c. the beginning of the twentieth century
• d. the 1840s

8. Which of the steps is not included in the process of reception?

• a. decoding
• b. encoding
• c. storage
• d. interpretation

9. The acoustic channel is used for which of the following?

• a. UHF communications
• b. single-sideband communication
• c. television communications
• d. person-to-person voice communications

10. Amplitude modulation is the process of

• a. superimposing a low frequency on a high frequency
• b. superimposing a high frequency on a low frequency
• c. carrier interruption
• d. frequency shift and phase shift