This is the Multiple Choice Questions in Chapter 9: Antennas from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. An ungrounded antenna near the ground
- a. acts as a single antenna of twice the height
- b. is unlikely to need a ground screen
- c. acts as an antenna array
- d. must be horizontally polarized
2. One of the following consists of nonresonant antennas:
- a. The rhombic antenna
- b. The folded dipole
- c. The end-fire array
- d. The broadside array
3. One of the following is very useful as a multiband HF receiving antenna. This is the:
- a. conical horn
- b. folded dipole
- c. log periodic
- d. square loop
4. Which of the following antennas is best excited from a waveguide?
- a. Biconical
- b. Horn
- c. Helical
- d. Discone
5. Indicate which of the following reasons for using a counterpoise with antenna is false:
- a. Impossibility of a good ground connection
- b. Protection of personnel working underground
- c. Provision of an earth for the antenna
- d. Rockiness of the ground
6. One of the following is nota reason for the use of an antenna coupler:
- a. To make the antenna look resistive
- b. To provide the output amplifier with the correct load impedance
- c. To discriminate against harmonics
- d. To prevent reradiation of the local oscillator
7. Indicate the antenna that is not wideband L:
- a. Discone
- b. Folded Dipole
- c. Helical
- d. Marconi
8. Indicate which one of the following reasons for the use of a ground screen with antennas is false:
- a. Impossibility of a good ground connection
- b. Provision of an earth for the antenna
- c. Protection of personnel working underneath
- d. Improvement of the radiation pattern of the antenna
9. Which one of the following terms does not apply to the Yagi-Uda array?
- a. Good bandwidth
- b. Parasitic elements
- c. Folded dipole
- d. High gain
10. An antenna that is currently polarized us the
- a. helical
- b. small circular loop
- c. parabolic reflector
- d. Yagi-Uda
11. The standard reference antenna for the directive gain is the
- a. infinitesimal dipole
- b. isotropic antenna
- c. elementary doublet
- d. half-wave dipole
12. Top loading is sometimes used with an antenna in order to increase its
- a. effective height
- b. bandwidth
- c. beamwidth
- d. input capacitance
13. Cassegrain feed is used with a parabolic reflector to
- a. increase the gain of the system
- b. increase the beamwidth of the system
- c. reduce the size of the main reflector
- d. allow the feed to be placed at a convenient point
14. Zoning is used with a dielectric antenna in order to
- a. reduce the bulk of the lense
- b. increase the bandwidth of the lens
- c. increase pin-point focusing
- d. correct the curvature of the wavefront from a horn that is too short
15. A helical antenna is used for satellite tracking because of its
- a. circular polarization
- b. maneuverability
- c. broad bandwidth
- d. good front-to-back ratio
16. The discone antenna is
- a. useful direction-finding antenna
- b. used as a radar receiving antenna
- c. circularly polarized like other circular antennas
- d. useful as UHF receiving antennas
17. One of the following is not an omnidirectional antenna:
- a. Half-wave dipole
- b. Log-periodic
- c. Discone
- d. Marconi
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