10. radiated from an antenna is considered horizontally polarized under which of the following conditions?

c. if the electric field is in the horizontal plane

a. if the wavefront is in the horizontal plane

b. if the magnetic field is in the horizontal plane

d. if the induction field is in the horizontal plane

11. What is a good way to get maximum performance from a Yagi antenna?

a. optimize the lengths and spacing of the elements

c. use a reactance bridge to measure the antenna performance from each direction around the antenna

d. avoid using towers higher than 9 metres (30 feet) above the ground

12. Which of the following describes a Marconi antenna?

b. it has an impedance of 73 ohms

c. its drawback is that it is only limited for horizontal polarization

13. The most common means of obtaining a low-radiation angle from a vertical quarter-wave antenna is by what procedure?

d. rotating the antenna to a horizontal plane

14. An antenna's beamwidth is measured:

a. from +90 degrees to -90 degrees

d. between the minor side-lobes

15. The dimensions of a transmitting antenna are determined by which of the following factors?

d. antenna height above the ground

16. What is the low angle radiation pattern of an ideal half wavelength dipole HF antenna installed parallel to the earth?

a. it is a figure-eight, perpendicular to the antenna

b. It is a circle (equal radiation in all directions)

c. it is two smaller lobes on one side of the antenna, and one larger lobe on the other side

d. it is a figure-eight, off both ends of the antenna

19. "Ground Effects" refers to the effects on an antenna's radiation pattern caused by:

a. radio signals reflecting off the ground

b. buildings and other structures on the ground

d. faulty connection of the feed cable ground

20. A complete antenna system consists of which of the following components?

b. a feeder line, a coupling device, and an antenna

a. a feeder , a coupling device, and a transmitter

c. an antenna, a transmission line, and a receiver

d. an impedance-matching device, a feeder , and a transmission line

21. How does the bandwidth of a folded dipole antenna compare with that of a simple dipole antenna?

c. it is 0.707 times the bandwidth

24. Which of the following describes the reflector?

a. a parasitic element 5% shorter than the driven element

b. it tends to increase radiation in its own direction

28. Which of the following describes a loop antenna?

b. it is simply a single-turn coil of wire that is shorter than one wavelength and carries RF current

a. a horizontally polarized antenna consists of a wire loop above

c. it has a bidirectional radiation pattern

31. In a parasitic array:

b. only one of the elements is driven, the others get excitation from the field produced by the driven element

a. only one of the elements is driven, the others get excitation

c. all the elements in the antenna get excitation from inductive

32. A non-resonant antenna:

c. will cause SWR on the feed cable

33. Why would you use a dummy antenna?

b. to allow antenna tuning without causing interference

a. to give comparative signal reports

34. Which of the following describes a Yagi-Uda antenna?

a. a parasitic array with linear elements

b. it consist mainly of one or more driven elements

41. The resonant frequency of an antenna may be increased by:

c. shortening the radiating element

a. lowering the radiating element

b. increasing the height of the radiating element

d. lengthening the radiating element

43. The magnetic field of an antenna is perpendicular to the earth. The antenna's polarization:

d. cannot be determined from the information given

44. An antenna has "gain" as compared to:

b. a vertically polarized radiator

47. The directivity pattern resulting from the action of parasitic elements depends on which of the following element characteristics?

c. spacing between parasitic and driven elements

CHAPTER 4 (1-53)

Authored by Hades Vlank

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. Which of the following choices below is the primary purpose of a dummy load?

a. to prevent the radiation of signals when making tests

b. to prevent over-modulation of your transmitter

c. to improve the radiation from your antenna

d. to improve the signal to noise ratio of your receiver

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2. Applying RF energy to the elements of an antenna results in what phase relationship voltage and current?

a. voltage lags current by 90 degrees

b. voltage leads current by 90 degrees

c. voltage and current are 180 degrees out of phase

d. voltage and current are in phase

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3. Which beam width represents the best antenna directivity?

a. 7

c. 19

b. 12

d. 28

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

4. The addition of parasitic elements to the Yagi antenna has which of the effects on antenna characteristics?

a. increased gain

b. narrower beam width

c. narrower frequency response

d. each of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

5. In trap antenna, if the operating frequency is below that of a trap resonance, the trap behaves as a/n:

a. series resonant circuit

b. parallel resonant circuit

c. inductor

d. capacitor

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

6. The polarity of a radio wave is determined by the orientation of (a) what moving field with respect to (b) what reference?

a. (a) electric (b) earth

b. (a) electric (b) antenna

c. (a) magnetic (b) antenna

d. (a) magnetic (b) earth

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

7. What does "antenna front-to-back ratio" mean in reference to a Yagi antenna?

a. the relative position of the driven element with respect to the reflectors and directors

b. the power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction

c. lobe compared to the power radiated 90 degrees away from that direction

d. the number of directors versus the number of reflectors

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CHAPTER 4 (1-53)

1. Which of the following choices below is the primary purpose of a dummy load?

2. Applying RF energy to the elements of an antenna results in what phase relationship voltage and current?

3. Which beam width represents the best antenna directivity?

4. The addition of parasitic elements to the Yagi antenna has which of the effects on antenna characteristics?

5. In trap antenna, if the operating frequency is below that of a trap resonance, the trap behaves as a/n:

6. The polarity of a radio wave is determined by the orientation of (a) what moving field with respect to (b) what reference?

7. What does "antenna front-to-back ratio" mean in reference to a Yagi antenna?

8. It is ideally suited to HF transmission and reception and is very popular antenna in commercial point-to-point communications.

9. The front-to-back ratio of a half-wave dipole antenna is:

10. radiated from an antenna is considered horizontally polarized under which of the following conditions?

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