# Forouzan: MCQ in Analog Transmission

(Last Updated On: December 28, 2017)

This is the MCQs in Analog Transmission from book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in datacom, a topic in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.

In this particular topic you have learned the two types of conversion: digital-to- analog conversion and analog-to-analog conversion. If you skip the summary visit Analog Transmission which refers to the transmission of analog signals using a band-pass channel.

#### Begin and Good luck!

Choose the letter of the best answer in each questions.

1. In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant

• A)   PSK
• C)   FSK
• D)   QAM

Solution:

2. How many carrier frequencies are used in BPSK?

• A)   0
• B)   1
• C)   2
• D)   none of the above

Solution:

3. The constellation diagram of 16-QAM has ______ dots.

• A)   4
• B)   8
• C)   16
• D)   none of the above

Solution:

4. AM and FM are examples of ________ conversion.

• A)   analog-to-analog
• B)   digital-to-digital
• C)   analog-to-digital
• D)   digital-to-analog

Solution:

5. The Federal Communications Commission (FCC) allows ______ kHz for each FM station.

• A)   20
• B)   100
• C)   200
• D)   none of the above

Solution:

6. Analog-to-analog conversion is needed if the available bandwidth is _______.

• A)   band-pass
• B)   low-pass
• C)   either (a) or (b)
• D)   neither (a) nor (b)

Solution:

7. In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

• A)   AM
• B)   FM
• C)   PM
• D)   none of the above

Solution:

8. How many carrier frequencies are used in QPSK?

• A)   0
• B)   2
• C)   1
• D)   none of the above

Solution:

9. Which of the following is not a digital-to-analog conversion?

• A)   FSK
• C)   AM
• D)   PSK

Solution:

10. _______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.

• A)   Analog-to-analog
• B)   Digital-to-digital
• C)   Digital-to-analog
• D)   Analog-to-digital

Solution:

11. If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps.

• A)   100
• B)   400
• C)   800
• D)   1600

Solution:

12. In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.

• A)   PSK
• B)   FSK
• D)   QAM

Solution:

13. Which of the following is not an analog-to-analog conversion?

• A)   QAM
• B)   AM
• C)   PM
• D)   FM

Solution:

14. How many carrier frequencies are used in BASK?

• A)   0
• B)   1
• C)   2
• D)   none of the above

Solution:

15. Quadrature amplitude modulation (QAM) is a combination of ___________.

• A)   PSK and FSK
• D)   none of the above

Solution:

16. In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant.

• B)   FSK
• C)   PSK
• D)   QAM

Solution:

17. If the bit rate for an ASK signal is 1200 bps, the baud rate is ________.

• A)   1200
• B)   600
• C)   400
• D)   300

Solution:

18. The constellation diagram of BPSK has ______ dots.

• A)   0
• B)   1
• C)   2
• D)   none of the above

Solution:

19. The constellation diagram of QPSK has ______ dots.

• A)   4
• B)   2
• C)   1
• D)   none of the above

Solution:

20. In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency.

• A)   OOK
• B)   PSK
• C)   FSK
• D)   none of the above

Solution:

21. If the bit rate for a 16-QAM signal is 4000 bps, what is the baud rate?

• A)   1200
• B)   1000
• C)   400
• D)   300

Solution:

22. ASK, PSK, FSK, and QAM are examples of ________ conversion.

• A)   analog-to-analog
• B)   digital-to-digital
• C)   analog-to-digital
• D)   digital-to-analog

Solution:

23. If the bit rate for an FSK signal is 1200 bps, the baud rate is ________.

• A)   1200
• B)   600
• C)   400
• D)   300

Solution:

24. The constellation diagram of BASK has ______ dots.

• A)   0
• B)   1
• C)   2
• D)   none of the above

Solution:

25. The Federal Communications Commission (FCC) allows ______kHz for each AM station.

• A)   20
• B)   10
• C)   5
• D)   none of the above

Solution:

26. How many carrier frequencies are used in BFSK?

• A)   2
• B)   1
• C)   0
• D)   none of the above

Solution:

27. In _____ transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal.

• A)   AM
• B)   FM
• C)   PM
• D)   none of the above

Solution:

28. _________ conversion is the representation of analog information by an analog signal.

• A)   Analog-to-analog
• B)   Digital-to-digital
• C)   Analog-to-digital
• D)   Digital-to-analog

Solution:

29. In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal.

• A)   PM
• B)   FM
• C)   AM
• D)   none of the above

Solution:

30. In QAM, both ________ of a carrier frequency are varied.

• A)   phase and frequency
• B)   amplitude and phase
• C)   frequency and amplitude
• D)   none of the above

Solution:

31. ________ uses two carriers, one in-phase and the other quadrature.

• A)   QAM
• C)   FSK
• D)   PSK

Solution:

32. Given an AM radio signal with a bandwidth of 10 KHz and the highest-frequency component at 705 KHz, what is the frequency of the carrier signal?

• A)   710 KHz
• B)   705 KHz
• C)   700 KHz
• D)   Cannot be determined from given information

Solution:

33. A constellation diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature).

• A)   amplitude and frequency
• B)   amplitude and phase
• C)   frequency and phase
• D)   none of the above

Solution:

34. If the baud rate for a 64-QAM signal is 2000, what is the bit rate?

• A)   12000
• B)   1000
• C)   400
• D)   300

Solution: