All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers
- particularly those who are fresh out of school or are relatively new to the work world. Come to
think of it, they would make equally excellent study material for the same persons who are going to
be interviewed for a job.
Some of these books used in quizzes are available as prizes
in the monthly RF Cafe Giveaway.
Note: Many answers contain passages quoted in whole or in part from the text.
This quiz is based on the information presented in
Antennas and Site Engineering for Mobile Radio Networks, by Bruno Delorme.
Graciously provided by
The book is divided into three sections: the first section describes the functioning of all
types of antennas used in mobile phone networks and provides examples of each; the second part
delves into the engineering of antenna sites, which is crucial to the quality of mobile networks;
the third part of the book includes refresher information on the mathematics and physics necessary
to understand the content of the book and put it to practical use in actual applications. The
book is packed with clear explanations and recommendations for avoiding problems and making the
best antenna and site decisions.
1. In Coulomb's Law, F =
m x m'
/ 4πεr2, what are
a) Two masses
b) Two magnetic domains
c) Two electric charges
Two general physical entities
2. With what phenomenon
did James Clerk Maxwell compare electromagnetic wave propagation?
a) A stone dropped
into a pond
b) A flickering candle
c) A sonic boom
d) An ant's wanderings
3. What did Edouard Branly use as the amplification element
of his 'radio conductor' detection device?
d) Cat's whisker
4. What is the
Poynting Vector? (Wikipedia page for
Poynting Vector animation)
a) A vector that points in the direction of the electric (E)
and magnetic (H) fields
A vector always pointing in the direction of least RF resistance
c) The pathogen-transmitting
organism that famously infected physicist John Henry Poynting
d) The vectorial product
of the electric (E) and magnetic
(H) fields at a given point
5. What is the defining feature of a panel antenna?
a) Is uses a conductive panel behind the antenna array for providing directivity
b) It uses a panel of antennas
c) It is an antenna shaped like flat panel
It is an antenna shaped like parabolic panel
of the following factors affect the radiation pattern of an antenna mounted on a pylon or mast?
a) Type of support (pylon or tubular mast)
b) Antenna distance from the pylon
or tubular mast
c) Cross-section of the pylon or tubular mast
d) All the above
7. In order to isolate co-located antennas with vertical
polarization, which of the two minimum separation distances are required.
in the vertical and the horizontal
b) λ in the vertical and 3λ in the horizontal
c) 10λ in the vertical
d) 10λ in the horizontal
What are the main sources of noise from transmitter?
a) Harmonic distortion and oscillator
b) Noise in the modulating signal
c) Passive intermodulation (PIM)
d) Wind-induced Doppler from swaying antenna
What type of illumination must a parabolic reflector utilize for proper operation?
Left-hand circular polarization
b) Right-hand circular polarization
d) Trapezoidal wave
10. Which governing
body is responsible for worldwide frequency coordination?
a) The Université de Intercontinental
b) The International Telephone Users (ITU)
c) The Interdenominational
Telecommunications Union (ITU)
d) The International Telecommunications Union (ITU)
Need some help? Click here for the
answers and explanations.
Posted July 21, 2013