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CoE422 – Principles of CommunicationMIdterm Examination- February 13, 2014

I. Multiple Choice: Encircle the letter of the best answer to a question or a word described by a phrase. NO ERASURES! (2 pts each)1. What is the cable used for Thicknet?

A. RG 58 B. RG 8C. RG 75 D. RG 59

2. What is the frequency range of a VHF?A. 3KHz-30KHz B. 30KHz-300KHzC. 3MHz-30MHz D. 30MHz-300MHz

3. Angle of incidence that results to a 90 degrees angle of refraction;

A. right angle B. bipolar C. critical angle D. divided angle 4. What

is the meaning of R in RG 58?A. Registered B. RecommendedC. Radio D. Random

5. Connector used in Thinnet cableA. RJ45 B. BNCC. vampire tap D. SC connector

6. Allows data to be transmitted in an analog telephone line;

A. router B. multiplexerC. modem D. switch

7. Uses positive and negative voltage levels;A. unipolar B. bipolarC. manchester D. polar

8. Sampling rate must be twice the highest frequency of the original signal;

A. Hertz B. ShannonC. Nyquist D.

9. Propagation of a Low Frequency signal?A. ionospheric B. surfaceC. satellite D. L-O-S

10. What is the speed of light in a vacuum?A. 3 x 108 km/sec B. 3 * 108 mi/secC. 30 x 106 m/sec D. 300 x 106 m/sec

11. Simultaneous transmission of multiple signals across a single data link;

A. routing B. multiplexingC. switching D. keying

12. The type of cable used in Fast Ethernet;A. UTP B. STP C. coax D. FO

13. Which FO cable is more precise;A. single mode B. multimode C. graded index D. step index

14. Transmission mode used in a two way radio;A. simplex B. half-duplexC. full-duplex D. none

15. Developed the standard for UTP Category;A. EIA B. IEEEC. ISO D. FCC

16. ___ antennas can transmit in different directions;A. directional B. unidirectionalC. omnidirectional D. bi-directional

17. Immune to EMI;A. UTP B. STPC. coax D. FO

18. Density of the core is constant from the center to the edge;

A. multimode B. single modeC. graded-index D. step-index

190. Connectors used in thinnet;A. vampire tap B. BNCC. RG 58 D. RJ45

20. Type of propagation used by MF;A. tropospheric B. ionosphericC. surface D. space

21. Encoding Technique used by Fast Ethernet;A. Bipolar B. PSK C. Differential Manchester D. NRZ

22. Which of the following is an example of analog transmission of analog information ;

A. Manchester B. PCMC. ASK D. PM

23. A 48 GHz frequency is considered as _____.A. UHF B. VHFC. SHF D. EHF

24. A type of fiber optic cable with small diameter for its core;

A. single mode B. multimodeC. graded index D. step index

25. A type of satellite that points at one area in earth at all time;

A. single mode B. multimodeC. graded index D. step index

II. Line Coding: Draw a graph to encode the information, 11000101, using the following techniques. Write your answer at the back page. Please indicate bit intervals in your graph.

1. NRZ-I2. Differential Manchester3. RZ4. ASK5. FSK

III. ACRONYM. Write the meaning of the following acronyms.

1. PCM2. TDM3. ASK4. SC connector5. DTMF

IV. Discussion: Answer the following items at the back page.

1. Enumerate the options for the different transmission media. What are the advantages and disadvantages of each one of them? What are your criteria in selecting a media?

2. What is your phone number? Describe the different parts of your number?

GOOD LUCK!