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# MCQ in Antennas Part 1 | ECE Board Exam

This is the Multiples Choice Questions Part 1 of the Series in Antennas 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.

#### Online Questions and Answers Topic Outline

• MCQ in Basic considerations
• MCQ in Wire Radiators in Space
• MCQ in Current and Voltage Distributions
• MCQ in Resonant and Non-resonant Antennas
• MCQ in Antenna Terms and Definition
• MCQ in Antenna Gain and Resistance
• MCQ in Bandwidth, Beamwidth and Polarization
• MCQ in Grounded and Ungrounded Antennas
• MCQ in Grounding Systems and Matching Systems
• MCQ in Antenna Types
• MCQ in Directional and Non-directional Antennas
• MCQ in Microwave Antennas
• MCQ in Wideband and Special Purpose Antennas

#### Start Practice Exam Test Questions Part 1 of the Series

1. What is the polarization of a discone antenna?

A. Vertical

B. Horizontal

C. Circular

D. Spiral

Solution:

2. If the antenna increases 3.3 times how much does the radiated power increase?

A. 3.3 times

B. 10.89 times

C. 9.9 times

D. 6.6 times

Solution:

3. When speaking of antennas. ______ is a section which would be a complete antenna by itself.

A. image

C. bay

D. quarterwave

Solution:

4. In what range of frequencies are most omnidirectional horizontally polarized antennas used?

A. VHF, UHF

B. VLF, LF

C. SH, EHF

D. MF, HF

Solution:

5. If the current ratios of the two or more elements must be held 5% and the phase angle to 3ยฐ the antenna is called a

A. end fire array

B. critical phased array

D. wideband array

Solution:

6. A device that converts high frequency current into electromagnetic wave.

A. Antenna

B. Loudspeaker

C. Microphone

D. Transducer

Solution:

7. Which is a non-resonant antenna?

A. Rhombic antenna

B. Folded dipole

C. End-fire array

D. Yagi-Uda antenna

Solution:

8. Gain of a half-wave dipole antenna over isotropic.

A. 2.15 dB

B. 1.76 dB

C. 1 dB

D. 0 dB

Solution:

9. Very low signal strength in antenna.

A. Minor lobes

B. Null

C. Antenna patterns

D. Major lobes

Solution:

10. What is the gain of the Hertzian dipole over isotropic antenna?

A. 1.64 dB

B. 2.15 dB

C. 1.76 dB

D. 1.55 dB

Solution:

11. ______ is the measurement of a unilateral antenna properties of directivity

A. Phase angle

B. Antenna gain

C. Beamwidth

D. Bandwidth

Solution:

12. In testing transmitter to prevent interfering with other stations, which type of antenna must be used?

A. Void antenna

B. Dummy antenna

C. Hertzian antenna

D. Isotropic antenna

Solution:

13. The best solution to fading is _____.

A. space diversity

B. frequency diversity

C. polarization diversity

D. wavelength diversity

Solution:

14. _____ is the amount of uncertainty in a system of symbols

A. Bandwidth

B. Enthalpy

C. Entropy

D. Quantum

Solution:

15. If an antenna has a gain of 3 dB, it increases the output of the transmitter by

A. 10,000 times

B. 1000 times

C. 100 times

D. 1 million times

Solution:

16. Top loading is used in an antenna in order to increase its ______.

A. practical height

B. beamwidth

C. effective height

D. input capacitance

Solution:

17. A horizontal antenna is _____.

A. vertically polarized

B. horizontally polarized

C. centrally polarized

D. circularly polarized

Solution:

18. All elements in a beam _____ antennas are in line

A. collinear

B. yagi

D. log-periodic

Solution:

19. Which does not use vertical polarization antenna?

C. Mobile Communications

D. Satellite Communications

Solution:

20. Lightning rods must be mounted a top structure not less than ___ above the highest point.

A. 10 cm

B. 20 cm

C. 30 cm

D. 40 cm

Solution:

21. _____ is an antenna with a number of half-wave antenna on it.

A. Antenna array

B. Tower

C. Omni-directional

D. Rhombic

Solution:

22. Which antenna radiates an omnidirectional pattern in the horizontal plane with vertical polarization?

A. Marconi antenna

B. Discone antenna

C. Horn antenna

D. Helical antenna

Solution:

23. An antenna with very high gain and very narrow beamwidth.

A. Helical antenna

B. Discone antenna

C. Horn antenna

D. Parabolic dish antenna

Solution:

24. What determines antenna polarization?

A. The frequency of the radiated wave

B. The direction of the radiated wave

C. The direction of the magnetic field vector

D. The direction of the electric field vector

Solution:

25. _____ is the horizontal pointing angle of an antenna

A. Azimuth

B. Angle of elevation

C. Right angle

D. Beamwidth

Solution:

26. A dipole antenna requires to be fed with 20 kW of power to produce a given signal strength to a particular distant point. If the addition of a reflector makes the same field strength available with an input power of 11kW. What is the gain in dB, obtained by the use if the reflector. (Gain referred to this particular dipole).

A. 4.75

B. 2.6

C. 1.81

D. 4.24

Solution:

27. What is the estimated medium wind loading in the Philippines for antenna tower design?

A. 300 kph

B. 100 kph

C. 200 kph

D. 250 kph

Solution:

28. Discone radiation pattern is ______.

A. omnidirectional/vertical polarized

B. unidirectional

C. bidirectional

D. figure of eight

Solution:

29. _____ is an open-ended slot antenna

A. Helical antenna

B. Rhombic antenna

C. Notch antenna

D. Cassegrain antenna

Solution:

30. Which antenna is a properly terminated?

A. Marconi

B. Rhombic

C. Dipole

D. Yagi-Uda

Solution:

31. What is the radiation characteristic of a dipole antenna?

A. Omnidirectional

B. Bidirectional

C. Unidirectional

D. Hemispherical

Solution:

32. What is the theoretical gain of a Hertzian dipole?

A. 1.76 dB

B. 2.15 dB

C. 3 dB

D. 0 dB

Solution:

33. An antenna with unity gain

A. Rhombic

B. Half-wave dipole

C. Isotropic

D. Whip

Solution:

34. How will you increase the gain of an antenna?

A. By adding several antennas in parallel

B. By focusing the radiated energy in one desired direction

C. By making antenna rods thicker

D. By making the antenna size larger

Solution:

35. An antenna which is one-tenth wavelength long

A. Hertzian dipole

B. Loop antenna

C. Marconi antenna

D. Elementary doublet

Solution:

36. What is the minimum number of turns a helix antenna must have?

A. 3

B. 5

C. 4

D. 6

Solution:

37. What is the gain of isotropic antenna?

A. 10

B. 1

C. 10

D. 100

Solution:

38. Which of the following improves antenna directivity?

A. Driven element

B. Reflector element

C. Director element

D. Parasitic element

Solution:

39. The antenna radiates _____ polarized waves when the transmitter antenna is horizontally installed.

A. Vertically

B. negatively

C. horizontally

D. circularly

Solution:

40. The length of a Marconi antenna to operate with 985 kHz is ______.

A. 200 ft

B. 500 ft

C. 250 ft

D. 999 ft

Solution:

41. What is the front-to-back ratio of an antenna which radiates 500 watts in a northernly direction and 50 watts in a southernly direction?

A. 25000 dB

B. 10 dB

C. 100 dB

D. 20 dB

Solution:

42. If 4 kW in antenna produces 50 ฮผV/m in a receiving antenna, a 15 kW will produce _____.

A. 200 ฮผV/m

B. 10 ฮผV/m

C. 100 ฮผV/m

D. 20 ฮผV/m

Solution:

43. If the radiated power increase 10.89 times, the antenna current increases by ______.

A. 3.3 times

B. 6.6 times

C. 1.82 times

D. 10.89 times

Solution:

44. The frequency of operation of a dipole antenna cut to a length of 3.4 m.

A. 88 MHz

B. 44 MHz

C. 22 MHz

D. 11 MHz

Solution:

45. Comparing the signal strength arriving at the driven element from the desired direction to the signal strength reaching the driver from the opposite direction.

A. Directivity

B. Sensitivity

C. Beamwidth

D. Front-to-back ratio

Solution:

46. What is the capture area of a dipole operated at 75 MHz?

A. 4 mm

B. 2 m^2

C. 2.088 m^2

D. 4.088 m^2

Solution:

47. _____ of an antenna is a measure of how the antenna concentrates its radiated power in a given direction.

A. Efficiency

B. Power

C. Gain

D. Polarization

Solution:

48. Shortening effect of an antenna that makes it appear as if it were 5% longer.

A. End effect

B. Flywheel effect

C. Skin effect

D. Capture effect

Solution:

49. Harmonic suppressor connected to an antenna.

A. Low-pass filter

B. High-pass filter

C. M-derived filter

D. Constant-K

Solution:

50. A simple half-wavelength antenna radiates the strongest signal

A. at 45 degrees to its axis

B. parallel to its axis

C. at right angles to its axis

D. at 60 degrees to its axis

Solution:

#### Questions and Answers in Antennas Series

Following is the list of multiple choice questions in this brand new series:

MCQ in Antennas
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                 Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                 Answer key: PART 7
PART 8: MCQ from Number 351 โ 400                 Answer key: PART 8
PART 9: MCQ from Number 401 โ 450                 Answer key: PART 9
PART 10: MCQ from Number 451 โ 500                 Answer key: PART 10

### Complete List of MCQ in Communications Engineering per topic

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