Communications Engineering Mastery Test 14: ECE Pre-Board

(Last Updated On: January 7, 2018)

Communications Engineering Exam 14

This is 100 items Practice Examinations set 14 in Communications Engineering (Electronics Systems and Technology) composed of previous Board Exams Questions. Read each questions and choices carefully! Choose the best answer. In the actual board, you have to answer 100 items in Communications Engineering within 5 hours. You have to get at least 70% to pass the subject. Communications Engineering is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Engineering (30%). Familiarize each and every questions to increase the chance of passing the ECE Board Examination.

Start the Test Yourself Exam 14

Choose the letter of the best answer in each questions.

1. An area within a wireless communications system where there is no coverage

  • A. Dead spot
  • B. Hotspot
  • C. Weakspot
  • D. G-spot
View Answer:

Answer: Option A

Solution:

2. The world’s first active repeater satellite

  • A. Sputnik 1
  • B. Telstar 1
  • C. Courier 1B
  • D. Echo 1
View Answer:

Answer: Option C

Solution:

3. Which FCC regulation governs the unlicensed ISM band?

  • A. Subsection 11
  • B. Chapter 11
  • C. Part 15
  • D. 815.00
View Answer:

Answer: Option C

Solution:

4. The person behind the first network email

  • A. Ray Tomlinson
  • B. Bill Gates
  • C. Steve Jobs
  • D. Tim Berner Lee
View Answer:

Answer: Option A

Solution:

5. What is the horizontal scanning time for 20 pixels?

  • A. 1.5 µsecs
  • B. 2.5 µsecs
  • C. 2 µsecs
  • D. 0.125 µsecs
View Answer:

Answer: Option B

Solution:

6. Calculate the maximum distance between base and mobile that can be accommodated with a guard time of 123 µs.

  • A. 25.3 km
  • B. 36.9 km
  • C 8.5 km
  • D. 12.4 km
View Answer:

Answer: Option C

Solution:

7. In a satellite system, Johannes Kepler stated that “the square of the periodic time of orbit is proportional to the cube of the mean distance between the primary and the satellite’. This is also known as _____.

  • A. Kepler’s 3rd law
  • B. Kepler’s 2nd law
  • C. Kepler’s 1st law
  • D. Kepler’s law of areas
View Answer:

Answer: Option A

Solution:

8. A ghost is displaced 1 inch on a 13-inch diagonal TV screen. Determine the time between signal receptions, and the difference in path lengths.

  • A. 3.53 km
  • B. 1.53 km
  • C. 2.53 km
  • D. 0.53 km
View Answer:

Answer: Option B

Solution:

9. Slang term for someone who breaks an encrypted computer code or circuitry

  • A. Programmer
  • B. Cracker
  • C. Engineer
  • D. Hacker
View Answer:

Answer: Option B

Solution:

10. An FCC designation for any carrier or licensee whose wireless network is connected to the public switched telephone network and/or is operated for profit

  • A. Gateway
  • B. CMRS (Commercial Mobile Radio Service)
  • C. PSTN (Public Switched Telephone Network)
  • D VAN (Value Added Network)
View Answer:

Answer: Option B

Solution:

11. Placement of multiple antennas at a common physical site to reduce environmental impact and real estate costs and speed zoning approvals and network deployment

  • A. Frequency reuse
  • B. Collocation
  • C. Multiplexing
  • D. Duplexing
View Answer:

Answer: Option B

Solution:

12. Why is there a frequency term in the equation for free-space path loss?

  • A. Atmospheric absorption
  • B. Antenna geometry requires it
  • C. Because of the distance involved
  • D. There is no frequency term
View Answer:

Answer: Option B

Solution:

13. What is a primary advantage of offset-quadrature-phase shift-keying (OQPSK) over standard QPSK?

  • A. Greater spectral efficiency
  • B. More constant envelope power
  • C. Greater data rates possible
  • D. Lower noise density
View Answer:

Answer: Option B

Solution:

14. One of the standard units for radiation dosimetry, but is not applicable to alpha, beta, or other particle emission and does not accurately predict the tissue effects of gamma rays of extremely high energies.

  • A. curie
  • B. roentgen
  • C. gray
  • D. Sievert
View Answer:

Answer: Option B

Solution:

15. A moving target 0 degrees from the nose.

  • A. dead ahead
  • B. on starboard bow
  • C. dead astern
  • D. on port quarter
View Answer:

Answer: Option A

Solution:

16. The monitoring, manipulating and troubleshooting of computer equipment through a wireless network

  • A. Wireless ethernet
  • B. Wireless IT
  • C. WiFi (Wireless Fidelity)
  • D. Radio sounding
View Answer:

Answer: Option B

Solution:

17. Consider a video signal that has a resolution of 640 x 480 pixels, with a frame rate 0f 30 Hz using progressive scanning. The luma signal is sampled using 8 bits/sample. The two chroma channels also use 8 bits/sample, but the color resolution is ¼ that is used for luma. Find the approximate bit rate for this signal, neglecting synchronization, error correction, and compression.

  • A. 110.6 Mbps
  • B. 1.6 Mbps
  • C. 10.6 Mbps
  • D. 11.6 Mbps
View Answer:

Answer: Option A

Solution:

18. The principle of data reduction which says that when reducing a set of data into the form of an underlying mode, one should be maximally non-committal with respect to missing data.

  • A. Jaynes maximum entropy principle
  • B. Maximum Entropy Principle
  • C. Kullback principle of minimum discrimination
  • D. Minimum discrimination principle
View Answer:

Answer: Option A

Solution:

19. A photodiode has a responsivity of 0.35 A/W; calculate the diode current if the input optical power is 400 nW.

  • A. 400 nA
  • B. 140 nA
  • C. 35 nA
  • D. 410 Na
View Answer:

Answer: Option B

Solution:

20. Which two systems are most likely to experience concurrent operation problems?

  • A. Bluetooth + WLAN
  • B. GSM + W-CDMA
  • C. Bluetooth + AMPS
  • D. WLAN + GSM
View Answer:

Answer: Option A

Solution:

21. Which best describes a bi-static radar?

  • A. Uses static electricity for both transmitted and received signals
  • B. Only detects fixed (non-moving) targets
  • C. Fixed transmitter and fixed receiver at different locations
  • D. Fixed transmitter and fixed receiver at the same locations
View Answer:

Answer: Option C

Solution:

22. In a network with 25 computers, which topology would require the most extensive cabling?

  • A. Bus
  • B. Star
  • C. Mesh
  • D. Ring
View Answer:

Answer: Option C

Solution:

23. Bluetooth is also known as

  • A. IEEE 802.12.1
  • B. IEEE 802.15x
  • C. IEEE 802.11b
  • D. IEEE 802.15.1
View Answer:

Answer: Option D

Solution:

24. Calculate the combine traffic intensity in erlang for the following calls:

Trunk 1: 32min and 15 sec Trunk 2: 17min and 41 sec

Trunk 3: 6min and 22 sec Trunk 4: 15min and 3 sec

Trunk 5: 24min

  • A. 5.78 Erlang
  • B. 1.6 Erlang
  • C. 24.12 Erlang
  • D. 231.5 Erlang
View Answer:

Answer: Option B

Solution:

25. Calculate the noise voltage for a 1-kΩ resistor at 17° C “tuned” by an LC circuit with a BW of 1 MHz.

  • A. 50.1 µV
  • B. 15.01 µV
  • C. 535.01 µV
  • D. 5.01 µV
View Answer:

Answer: Option D

Solution:

Communications Engineering Mastery Test 14: ECE Pre-Board
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