Antenna Theory & Wave Propagation- Online Test 4

15 Questions | By Srijitac | Last updated: Mar 22, 2022 | Total Attempts: 1199

Questions

Settings

Create your own Quiz

Antenna Theory & Wave Propagation- Online Test 4 - Quiz

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.

Questions and Answers

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.

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

The length of a Marconi antenna to operate with 985 kHz is ______.
- A.
  
  200 ft
- B.
  
  500 ft
- C.
  
  250 ft
- D.
  
  999 ft
8.

What is the gain of isotropic antenna?
- A.
  
  10
- B.
  
  1
- C.
  
  100
- D.
  
  1000
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