1. An underground antenna near theground

a. acts as a single antenna oftwice the height

b. is unlikely to need a groundscreen

c. acts as an antenna array

d. must be horizontallypolarized

2. One of the following consists ofnon-resonant 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 usefulas a multiband HF receivingantenna. This is the:

a. Conical horn

b. Folded dipole

c. Log-periodic

d. Square loop

4. Which of the following antennas isbest excited from a waveguide?

a. Biconical

b. Horn

c. Helical

d. Discone

5. Indicate which of the followingreasons for using a counterpoisewith antennas is false:

a. Impossibility of a goodground connection

b. Protection of personnelworking underneath

c. Provision of an earth for theantenna

d. Rockiness of the grounditself

6. One of the following is not reasonsfor the used of the antenna coupler:

a. To make the antenna lookresistive

b. To provide the outputamplifier with the correctload impedance

c. To discriminate againstharmonics

d. To prevent reradiation of theload oscillator

7. Indicate the antenna that is notwideband

a. Discone

b. Folded dipole

c. Helical

d. Marconi

8. Indicate which one of the followingreason for the used of a groundscreen with antenna is false:

a. Impossibility of a goodground connection

b. Provision of an earth for theantenna

c. Protection of personnel

working underneath

d. Improvement of the radiationpattern of the antenna

9. Which one the following terms doesnot apply to the Yagi-Uda array?

a. Good bandwidth

b. Parasitic elements

c. Folded dipole

d. High gain

10. An antenna that is circularlypolarized is the

a. Helical

b. Small circular loop

c. Parabolic reflector

d. Yagi-Uda

11. The standard reference antenna forthe directive gain is the

a. Infinitesimal dipole

b. Isotropic antenna

c. Elementary doublet

d. Half-wave dipole

12. Top loading is sometimes used withan antenna in order to increase its

a. Effective height

b. Bandwidth

c. Beamwidth

d. Input capacitance

13. Cassegrain feed is used with aparabolic reflector to

a. Increase the gain of the

system

b. Increase the beamwidth ofthe system

c. Reduce the size of the mainreflector

d. Allow the feed to be place ata convenient point

14. Zooming is used with a dielectricantenna in order to

a. Reduce the bulk of the lens

b. Increase the bandwidth ofthe lens

c. Permit pin-point focusing

d. Correct the curvature of thewavefront from a horn that istoo short

15. A helical antenna is used forsatellite tracking because of its

a. Circular polarization

b. Maneuverability

c. Broad bandwidth

d. Good front-to-back ratio

16. The discone antenna is

a. A useful direction-findingantenna

b. Used as a radar receivingantenna

c. Circularly polarized like othercircular antennas

d. Useful as UHF receivingantenna

17. One of the following is not an

omnidirectional antenna:

a. Half-wave dipole

b. Log-periodic

c. Discone

d. Marconi

18. A receiving antenna with abuilt-in-preamplifier.

a. Passive antenna

b. Active antenna

c. Active passive antenna

d. None of the above

19. An enclosure lined with materialthat absorbs electromagneticradiation

a. Echoic chamber

b. Unechoic chamber

c. Echoical chamber

d. Anechoic chamber

20. Angle measured upward from thehorizon. Used to describe antennapatterns and directions

a. Angle of elevation

b. Angle of inclination

c. Beamwidth

d. Bandwidth

21. A device to radiate or receiveelectromagnetic radiation at radiofrequencies

a. Receiver

b. Router

c. Antenna

d. Transmitter

22. An antenna system composed oftwo or more simpler antennaelements

a. Dipole

b. Array

c. Element

d. Zenith

23. The angle between the points on themajor lobe of an antenna at whichthe radiated power density isone-half its maximum value

a. Angle of elevation

b. Angle of inclination

c. Beamwidth

d. Bandwidth

24. Any antenna consisting of a singleconductor with zero current only atits two ends.

a. Dipole

b. Array

c. Element

d. Zenith

25. The ratio of the maximum to theaverage radiation intensity for anantenna

a. Relativity

b. Directivity

c. Front-to-back ratio

d. Back-to-front ratio

26. In an antenna array, an individualconductor or group of conductors

a. Dipole

b. Array

c. Element

d. Zenith

27. A distance far enough from anantenna that local inductive andcapacitance effects are insignificant

a. Center-field region

b. Near-field region

c. Far-field region

d. Mid-field region

28. The portion of an antenna patternbetween two nulls

a. Lobe

b. Side lobe

c. Minor lobe

d. Main lobe

29. The lobe in the direction ofmaximum radiation

a. Lobe

b. Side lobe

c. Minor lobe

d. Main lobe

30. The lobe with less intensity than themain lobe

a. Lobe

b. Side lobe

c. Minor lobe

d. Main lobe

31. An antenna with a current null atone end and a maximum at theother, with no other nulls in between

a. Dipole

b. Monopole

c. Side pole

d. None of the above

32. The region close to an antenna,where local inductive and capacitiveeffects predominate

a. Center-field region

b. Near-field region

c. Far-field region

d. Mid-field region

33. The directional of the electric fieldvector of an electromagnetic wave

a. Radiation

b. Polarization

c. Relativity

d. Directivity

34. A minor lobe at an angle ofapproximately 90˚ to the main lobe

a. Dipole

b. Monopole

c. Side pole

d. None of the above

35. Equivalent resistance at thefeedpoint corresponding to theradiation of energy by an antenna

a. Polarization resistance

b. Polarization impedance

c. Radiation resistance

d. Radiation impedance

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