Antenna Theory & Wave Propagation- Online Test 4
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The quiz below is the fourth and final one in a series of tests aimed at testing out how much you understand on antenna theory and wave propagation. Give it a try and do come back for more quizzes to help you in your end year applied physics exams.
- 1.What is the radiation characteristic of a dipole antenna?
- A.
Omnidirectional
- B.
Bidirectional
- C.
Unidirectional
- D.
Hemispherical
- 2.An antenna with unity gain
- A.
Rhombic
- B.
Half-wave dipole
- C.
Isotropic
- D.
Whip
- 3.What is the theoretical gain of a Hertzian dipole?
- A.
1.76 dB
- B.
2.15 dB
- C.
3 dB
- D.
0 dB
- 4.
- A.
By adding several antennas in parallel
- B.
By adding several antennas in parallel
- C.
By making antenna rods thicker
- D.
By making the antenna size larger
- 5.An antenna which is one-tenth wavelength long
- A.
Hertzian dipole
- B.
Loop antenna
- C.
Marconi antenna
- D.
Elementary doublet
- 6.What is the minimum number of turns a helix antenna must have?
- A.
3
- B.
5
- C.
4
- D.
6
- 7.What is the gain of isotropic antenna?
- A.
10
- B.
1
- C.
100
- D.
1000
- 8.The length of a Marconi antenna to operate with 985 kHz is ______.
- A.
200 ft
- B.
500 ft
- C.
250 ft
- D.
999 ft
- 9.What is the front-to-back ratio of an antenna which radiates 500 watts in a north direction and 50 watts in south direction?
- A.
25000 dB
- B.
10 dB
- C.
100 dB
- D.
20 dB
- 10.Which of the following improves antenna directivity?
- A.
Driven element
- B.
Reflector element
- C.
Director element
- D.
Parasitic element
- 11.The antenna radiates _____ polarized waves when the transmitter antenna is horizontally installed.
- A.
Vertically
- B.
Negatively
- C.
Horizontally
- D.
Circularly
- 12.. If 4 kW in antenna produces 50 μV/m in a receiving antenna, a 15 kW will produce _____.
- A.
200 μV/m
- B.
10 μV/m
- C.
100 μV/m
- D.
20 μV/m
- 13.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
- 14.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
- 15.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
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