Practice Quiz in Digital and Data Communication Networks Part 2

Quiz in Digital and Data Communication Networks

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This is the Online Practice Quiz in Digital and Data Communication Networks Part 2 as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Continue Part II of the Online Practice Quiz

Quiz in Digital and Data Communication Networks

Question 11. For an Ethernet bus that is 500 meters in length using a cable with a velocity factor of 0.66, and a communication rate of 10 Mb/s, calculate the total number of bits that would be sent by each station before it detects a collision, if both stations begin to transmit at the same time.

A. 25 bits

B. 30 bits

C. 19 bits

D. 41 bits

Question 12. What is the bandwidth required to transmit at a rate of 10Mbits/sec in the presence of a 28 dB S/N ratio?

A. 107.5 kHz

B. 3.57 MHz

C. 357.14 kHz

D. 1.075 MHz

Question 13. Which of the following modulation techniques are used by modems?

A. 16-QAM

B. FSK

C. 8-PSK

D. All of these

Question 14. In the EIA-RS-232 standard what does -12V on a data pin represent?

A. 1

B. 0

C. Undefined

D. Either 1 or 0 depending on the coding scheme

Question 15. The majority of the pins of the EIA-RS-232 interface are used for _____ purpose.

A. Control

B. Timing

C. Data

D. Testing

Question 16. 12 voice channels are sampled at 8000 sampling rate and encoded into 8-bit PCM word. Determine the rate of the data stream.

A. 768 kbps

B. 12 kbps

C. 12.8 kbps

D. 46.08 kbps

Question 17. Deliberate violations of alternate mark inversion are used in which type of digital-to-digital encoding?

A. AMI

B. B8ZS

C. RZ

D. Manchester

Question 18. Which of the following modems uses FSK modulation?

A. Bell 103

B. Bell 201

C. Bell 212

D. ALL of these

Question 19. The EIA-RS-232 interface has _______ pins.

A. 20

B. 36

C. 25

D. 19

Question 20. Which encoding method uses alternating positive and negative values for 1’s?

A. NRZ-I

B. RZ

C. Manchester

D. AMI

List of Practice Quizzes

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