Communications Engineering Mastery Test 1: ECE Pre-Board

(Last Updated On: January 8, 2018)

Communications Engineering Exam 1

This is 100 items Practice Examinations set 1 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 1

Choose the letter of the best answer in each questions.

1. ECE Board Exam March 1996

That dielectric material of an optical fiber surrounding the core

  • A. Cladding
  • B. Armor
  • C. Shield
  • D. Cover
View Answer:

Answer: Option A

Solution:

2. ECE Board Exam March 1996

An antenna that is circularly polarized is the ____________.

  • A. parabolic reflector
  • B. helical
  • C. Yagi-uda
  • D. small circular loop
View Answer:

Answer: Option B

Solution:

3. ECE Board Exam March 1996

A word in telegraphy consist of __________ characters plus a word space.

  • A. 11
  • B. 7 and ½
  • C. 8
  • D. 5
View Answer:

Answer: Option B

Solution:

4. ECE Board Exam March 1996

The number of voice band channels in master group per CCITT standard is __________.

  • A. 300
  • B. 480
  • C. 600
  • D. 120
View Answer:

Answer: Option A

Solution:

5. ECE Board Exam March 1996

The power of standard test tone is normally ____________.

  • A. 1 dB
  • B. 0 mW
  • C. 1 mW
  • D. 1 W
View Answer:

Answer: Option C

Solution:

6. ECE Board Exam March 1996

LORAN is a navigational system used primarily for _____________.

  • A. blind landing
  • B. obtaining your fixes location over large distances
  • C. automatic collision warning
  • D. approach control
View Answer:

Answer: Option B

Solution:

7. ECE Board Exam March 1996

The expander in a companding device provides ___________.

  • A. greater amplification for low signal levels
  • B. less amplification for low signal levels
  • C. greater amplification for high signal levels
  • D. lesser pressure for transmission cables
View Answer:

Answer: Option B

Solution:

8. ECE Board Exam March 1996

LORAN is a navigation system used primarily for

  • A. approach control
  • B. obtaining fixes over large distances
  • C. blind landing
  • D. automatic collision warning
View Answer:

Answer: Option B

Solution:

9. ECE Board Exam March 1996

At what power level does a 1 kHz tone cause zero interference (144 weighted) ?

  • A. -90 dB
  • B. -90 dBm
  • C. 90 dBm
  • D. 90 dB
View Answer:

Answer: Option B

Solution:

10. ECE Board Exam March 1996

One character or a sequence of characters forming a part, or the whole of a message with a specific meaning

  • A. Signs
  • B. Call sign
  • C. Code
  • D. Identifier
View Answer:

Answer: Option C

Solution:

11. ECE Board Exam March 1996

The K-factor under normal atmospheric conditions in a microwave radio data profile calculation is equal to ___________.

  • A. 2/3
  • B. 0
  • C. 4/3
  • D. Infinity
View Answer:

Answer: Option C

Solution:

12. ECE Board Exam March 1996

What is the IBM’s asynchronous data link protocol designation?

  • A. 83 B
  • B. 8A1 / 8B1
  • C. 93 B
  • D. 9A1/ 9B1
View Answer:

Answer: Option A

Solution:

13. ECE Board Exam March 1996

EIRP stands for _______________.

  • A. effective isotropic refracted power
  • B. effective and ideal radiated power
  • C. effective isotropic reflected power
  • D. effective isotropic radiated power
View Answer:

Answer: Option D

Solution:

14. ECE Board Exam March 1996

The modulation system used for telegraphy is

  • A. frequency-shift keying
  • B. two-tone modulation
  • C. pulse-code modulation
  • D. single-tone modulation
View Answer:

Answer: Option A

Solution:

15. ECE Board Exam March 1996

The standard that specifies a balanced interface cable that will operate bit rates up to 10 Mbps with in a span distances up to 1200 m.

  • A. RS-423A
  • B. RS-422A
  • C. RS-550A
  • D. RS-449A
View Answer:

Answer: Option B

Solution:

16. ECE Board Exam March 1996

An antenna which is not resonant at a particular frequencies and so can be used over a wide band of frequencies and so can be used over a wide band of frequencies is called

  • A. aperiodic
  • B. boresight
  • C. cassegrain
  • D. top-loaded
View Answer:

Answer: Option A

Solution:

17. ECE Board Exam March 1996

A receiver connected to an antenna whose resistance is 50 ohms has an equivalent noise resistance of 30 ohms. What is the receiver’s noise temperature?

  • A. 754 K
  • B. 464 K
  • C. 174 K
  • D. 293 K
View Answer:

Answer: Option C

Solution:

18. ECE Board Exam March 1996

___________ occurs when the microwave beam is at point of grazing over an obstacle.

  • A. Diffraction
  • B. Refraction
  • C. Absorption
  • D. Reflection
View Answer:

Answer: Option A

Solution:

19. ECE Board Exam March 1996

Atmospheric condition is controlled by

  • A. humidity
  • B. pressure
  • C. temperature
  • D. all of these
View Answer:

Answer: Option D

Solution:

20. ECE Board Exam March 1996

The characteristics impedance of a transmission line does not depend upon its ________.

  • A. conductor spacing
  • B. conductor diameter
  • C. length
  • D. conductor radius
View Answer:

Answer: Option C

Solution:

21. ECE Board Exam March 1996

What is the purpose of a beat frequency oscillator (BFO)?

  • A. Aid in the reception of weak voice-modulated signals
  • B. Generates a signal, whose frequency is the same as that of the intermediate frequency
  • C. Generates a 1 kHz note for Morse code reception
  • D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz
View Answer:

Answer: Option C

Solution:

22. ECE Board Exam March 1996

The point on the satellite orbit, closest to the earth is

  • A. prograde
  • B. perigee
  • C. zenith
  • D. apogee
View Answer:

Answer: Option B

Solution:

23. ECE Board Exam March 1996

The potential difference between any exposed structured to ground in any electrical installation should not exceed _________ volts RMS.

  • A. 10
  • B. 45
  • C. 0
  • D. 30
View Answer:

Answer: Option B

Solution:

24. ECE Board Exam March 1996

The capture area of an antenna is directly proportional to the

  • A. frequency of the received signal
  • B. distance between transmitter and receiver
  • C. gain of the antenna
  • D. power density of the signal
View Answer:

Answer: Option C

Solution:

25. ECE Board Exam March 1996

Modems are required to connect computer to telephone lines because ___________.

  • A. telephone company rules required them
  • B. the telephone network bandwidth is too high
  • C. none of the above
  • D. the telephone network will pass direct current
View Answer:

Answer: Option D

Solution:

Communications Engineering Mastery Test 1: ECE Pre-Board
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  1. Zarjerome Cajudo
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