All RF Cafe Quizzes make great 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.
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RF Cafe Quizzes.
Note: Some material based on books have
This quiz is based on the information
presented in Multi-Gigabit
Microwave and Millimeter-Wave Wireless Communications, by Jonathan Wells.
is the publisher.
1. Which entity is the primary
regulatory agency in the world with responsibility for coordinating
shared global use of the radio spectrum?
a) WWR (World Wide Radio)
b) GCU (Global Communications Union)
c) URU (Universal Radio Union)
d) ITU (International Telecommunication
2. What is a primary obstacle to FSO (Free Space Optics)
a) Very high attenuation
b) Nighttime-only operation
Difficulty generating the light
d) FM radio interference
3. Which condition causes the least amount of attenuation
on electromagnetic signals?
a) Moist air
b) Dry air
c) High wind
4. What is the equation for determining attenuation
factor (specific attenuation) due to snow and ice?
(R=snowfall rate in mm/hr, λ=wavelength in mm)
a) Attenuation Factor = λ/R
b) Attenuation Factor = λ/R2
c) Attenuation Factor = λ/R3
d) Attenuation Factor
= [(0.00349*R1.6)/λ4] + [(0.00224*R)/λ]
5. What is the equation for determining attenuation
due to foliage?
(f=frequency in MHz, R=depth of
foliage in m)
a) Loss = 10 log (f2R)
b) Loss = 20 log (fR)
c) Loss = 20R log (f)
d) Loss = 0.2f0.3R0.6
6. What is a primary feature of a plesiochronous digital
hierarchy (PDH) system?
a) Running in a state where different parts of the network are nearly,
but not quite perfectly, synchronized
b) Having features discovered
in the Plesioic era
c) Operating in an orthogonally asynchronous state
d) Using a deterministic hierarchy
7. What does the image to
the right depict?
a) An NTSC test signal for CATV
b) 256 QAM with phase noise
c) The whirlpool constellation
d) RF astigmatism
8. Which frequencies in the 60 GHz band are allocated
by the FCC for unlicensed use?
a) 57 to 64 GHz
b) Only at 60 GHz
c) 71 to 74 GHz
d) There are no unlicensed bands at 60 GHz
9. What is a link budget?
a) The cost of a communications system
b) The total link count
in a communications system
c) A fictitious number representing system
d) An accounting of all gains and losses in a communications
10. Which city would likely have higher 23 GHz system
availability due to weather?
a) Riyadh, Saudi Arabia
b) New Your City, USA
d) Singapore, Singapore
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