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Kennedy: MCQ in Amplitude Modulation

Kennedy: MCQ in Amplitude Modulation

This is the Multiple Choice Questions in Chapter 3: Amplitude Modulation 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. If the plate supply voltage for a plate-modulated class C amplifier is V, the maximum plate-cathode voltage could be almost as high as

a. 4 V

b. 3 V

c. 2 V

d. 1 V

View Answer:

Answer: Option A

Solution:

2. In a low-level AM system, amplifiers following the modulated stage must be

a. linear devices

b. harmonic devices

c. class C amplifiers

d. nonlinear devices

View Answer:

Answer: Option A

Solution:

3. If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be

a. 50

b. 150

c. 100

d. 66.66

View Answer:

Answer: Option D

Solution:

4. Leak-type bias is used in a plate-modulated class C amplifier to

a. prevent tuned circuit damping

b. prevent excessive grid current

c. prevent overmodulation

d. increase the bandwidth

View Answer:

Answer: Option B

Solution:

5. The output stage of a television transmitter is most likely to be a

a. plate-modulated class C amplifier

b. grid-modulated class C amplifier

c. screen-modulated class C amplifier

d. grid-modulated class A amplifier

View Answer:

Answer: Option B

Solution:

6. The modulation index of an AM wave is changed from 0 to 1. The transmitted power is

a. unchanged

b. halved

c. doubled

d. increase by 50 percent

View Answer:

Answer: Option D

Solution:

7. One of the advantages of the base modulation over collector modulation of a transistor class C amplifier is

a. the lower modulating power required

b. higher power output per transistor

c. better efficiency

d. better linearity

View Answer:

Answer: Option A

Solution:

8. A carrier is simultaneously modulated by two sine waves with modulation indices of 0.3 and 0.4; the total modulation index

a. is 1

b. cannot be calculated unless the phase relations are known

c. is 0.5

d. is 0.7

View Answer:

Answer: Option C

Solution:

9. Amplitude modulation is used for broadcasting because

a. it is more noise immune than other modulation systems.

b. Compared with other systems it requires less transmitting power

c. its use avoids receiver complexity.

d. no other modulation system can provide the necessary bandwidth for high fidelity

View Answer:

Answer: Option C

Solution:

10. What is the ratio of modulating power to total power at 100 percent modulation?

a. 1:3

b. 1:2

c. 2:3

d. None of the above

View Answer:

Answer: Option A

Solution:

Check your work.

Complete List of MCQ in Electronic Communication Systems by Kennedy

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