EW300 Final Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
Functions of a Weapon System - CORRECT ANSWER weapon selection
localization
neutralization
target detection
tracking
classification
frequency is equal to - CORRECT ANSWER wave propagation velocity divided by wavelength
Reflection - CORRECT ANSWER When an EM wave strikes a surface and bounces off it
Diffraction - CORRECT ANSWER The tendency of EM waves to spread out, or bend around
objects
Refraction - CORRECT ANSWER EM waves passes into a medium with a different speed of
propagation and the wave bends
Interference - CORRECT ANSWER A property by which EM waves superimpose and their
energies combine when overlapping
What type of interference occurs when EM waves interact with one another and the resultant wave
increases in amplitude - CORRECT ANSWER Constructive
Electromagnetic wave energy is attenuated due to _______, _______, and ______ - CORRECT
ANSWER spreading, absorption, and scattering
Two types of antenna polarization - CORRECT ANSWER Linear (verticle & horizontal)
Circular
,A difference in starting point between two EM waves is a difference in - CORRECT
ANSWER phase angle
Beamforming can be achieved by which two means - CORRECT ANSWER Antenna Array
Quasi-Optical reflectors
Two waves that are exactly 180 degrees out of phase will achieve _____ interference - CORRECT
ANSWER Destructive
Cross Range Resolution is used in comparison with distance of contacts at depth (along same bearing
and altitude) in order to determine whether they will be seen as separate contacts on a RADAR PPI
display based on the RADAR's PW and PCR - CORRECT ANSWER FALSE
Which of the following must be true to resolve a single target from a group - CORRECT
ANSWER Range resolution must be less than distance between actual targets at the same
bearing and altitude
Cross Range resolution (azimuth and elevation) must be less than actual distance between targets at
the same range
When dealing with Basic Pulse RADAR, the Duty Cycle (DC) is equal to which of the following: -
CORRECT ANSWER Pulse Width multiplied by the Pulse Repetition Frequency
Pulse Width divided by the Pulse Repetition Time
Average Power divided by the Peak Power
Which of the following results in enhanced cross range resolution - CORRECT
ANSWER Increasing antenna size
Increasing frequency
Decreasing range to target
Pulse Width (PW) - CORRECT ANSWER the active transmit time or duration of the
electromagnetic pulse
, Rest Time (RT) - CORRECT ANSWER the non-transmit time or the interval between
electromagnetic pulses
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for one transmission cycle
Pulse Repetition Frequency (PRF) - CORRECT ANSWER The number of pulses transmitted
per second
Average Power (Pavg) - CORRECT ANSWER the mean power transmitted over the entire
cycle
Peak Power (Ppk) - CORRECT ANSWER the maximum power transmitted by a RADAR
Duty Cycle (DC) - CORRECT ANSWER a ratio that represents the time that the transmitter is
on to one complete cycle of operation
Range Resolution (Rres) - CORRECT ANSWER the minimum range between two targets on
the same bearing that the RADAR system is able to distinguish as two separate targets
Cross Range Resolution (Rcross) - CORRECT ANSWER the minimum angular separation
between two targets at the same range that the RADAR system is able to distinguish as two separate
targets
Select the key components that make up a basic Continuous Wave (CW) Radar system - CORRECT
ANSWER Transmitter
Two antennas
mixer
receiver
Which of the following attributes pertain to a continuous wave RADAR system - CORRECT
ANSWER displays contact relative velocity
uses the principle of Doppler Shift to compare received frequency to transmitted frequency
QUESTIONS AND CORRECT ANSWERS
Functions of a Weapon System - CORRECT ANSWER weapon selection
localization
neutralization
target detection
tracking
classification
frequency is equal to - CORRECT ANSWER wave propagation velocity divided by wavelength
Reflection - CORRECT ANSWER When an EM wave strikes a surface and bounces off it
Diffraction - CORRECT ANSWER The tendency of EM waves to spread out, or bend around
objects
Refraction - CORRECT ANSWER EM waves passes into a medium with a different speed of
propagation and the wave bends
Interference - CORRECT ANSWER A property by which EM waves superimpose and their
energies combine when overlapping
What type of interference occurs when EM waves interact with one another and the resultant wave
increases in amplitude - CORRECT ANSWER Constructive
Electromagnetic wave energy is attenuated due to _______, _______, and ______ - CORRECT
ANSWER spreading, absorption, and scattering
Two types of antenna polarization - CORRECT ANSWER Linear (verticle & horizontal)
Circular
,A difference in starting point between two EM waves is a difference in - CORRECT
ANSWER phase angle
Beamforming can be achieved by which two means - CORRECT ANSWER Antenna Array
Quasi-Optical reflectors
Two waves that are exactly 180 degrees out of phase will achieve _____ interference - CORRECT
ANSWER Destructive
Cross Range Resolution is used in comparison with distance of contacts at depth (along same bearing
and altitude) in order to determine whether they will be seen as separate contacts on a RADAR PPI
display based on the RADAR's PW and PCR - CORRECT ANSWER FALSE
Which of the following must be true to resolve a single target from a group - CORRECT
ANSWER Range resolution must be less than distance between actual targets at the same
bearing and altitude
Cross Range resolution (azimuth and elevation) must be less than actual distance between targets at
the same range
When dealing with Basic Pulse RADAR, the Duty Cycle (DC) is equal to which of the following: -
CORRECT ANSWER Pulse Width multiplied by the Pulse Repetition Frequency
Pulse Width divided by the Pulse Repetition Time
Average Power divided by the Peak Power
Which of the following results in enhanced cross range resolution - CORRECT
ANSWER Increasing antenna size
Increasing frequency
Decreasing range to target
Pulse Width (PW) - CORRECT ANSWER the active transmit time or duration of the
electromagnetic pulse
, Rest Time (RT) - CORRECT ANSWER the non-transmit time or the interval between
electromagnetic pulses
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for one transmission cycle
Pulse Repetition Frequency (PRF) - CORRECT ANSWER The number of pulses transmitted
per second
Average Power (Pavg) - CORRECT ANSWER the mean power transmitted over the entire
cycle
Peak Power (Ppk) - CORRECT ANSWER the maximum power transmitted by a RADAR
Duty Cycle (DC) - CORRECT ANSWER a ratio that represents the time that the transmitter is
on to one complete cycle of operation
Range Resolution (Rres) - CORRECT ANSWER the minimum range between two targets on
the same bearing that the RADAR system is able to distinguish as two separate targets
Cross Range Resolution (Rcross) - CORRECT ANSWER the minimum angular separation
between two targets at the same range that the RADAR system is able to distinguish as two separate
targets
Select the key components that make up a basic Continuous Wave (CW) Radar system - CORRECT
ANSWER Transmitter
Two antennas
mixer
receiver
Which of the following attributes pertain to a continuous wave RADAR system - CORRECT
ANSWER displays contact relative velocity
uses the principle of Doppler Shift to compare received frequency to transmitted frequency
