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.
Click here for the complete list of RF Cafe
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.
quiz is based on the information presented in "The Micro-Doppler Effect in Radar," by Victor C. Chen .
What is the micro-Doppler effect?
a) An oscillatory motion in
addition to a bulk motion
b) Micron-scale Doppler effects
c) Large-scale nano-Doppler effects
d) High resolution Doppler measurements2.
Which of these is an image of
What is an Euler angle?
a) Angles of clockwise rotation about the x, y,
and z axes.
b) Angles of counterclockwise rotation about the x, y, and z axes.
c) Angles of RF conduction
d) Angles of dangles4.
Which of the following are mechanisms for producing
c) Coning motion
d) All the above
In the case of a rotating helicopter blade on a stationary aircraft, which Doppler frequency
graph would be correct?
In figure "a" from question 5, why is a plateau over a range of Doppler
in the blade signature rather than a single frequency?
a) Helicopter blades are broadband components
b) Blade speed varies along the span, increasing toward the
c) Blade speed varies along the span, decreasing toward the tips
d) Wobble along the span
What is the Denavit-Hartenberg (D-H convention)?
a) A quantum mechanics-based micro-Doppler
b) A way to describe static models as dynamic
c) A mathematical translation of aircraft micro motion
d) A kinematic representation of human body links and joints
When analyzing articulated locomotion (animal
walking, bird wing
flapping, etc.), what is
commonly assumed to describe the style of
b) Newtonian motion
c) Harmonic oscillations
d) Special relativity9.
What is the difference between bipedal and
a) Two additional feet
b) Two additional meters
c) Two additional furlongs
d) Two additional lightyears10.
Which parameters can be extracted from
micro-Doppler signatures of targets?
a) Time and frequency
b) Magnitude and phase of frequency shifts
c) Position and direction
d) All the above
Need some help? Click here for the
answers and explanations.