3-O-094: RADAR Equipment
3-94O1:
The permanent magnetic field that surrounds a traveling-wave tube (TWT) is intended to:
Prevent the electron beam from spreading.
Provide a means of coupling.
Prevent oscillations.
Prevent spurious oscillations.
3-94O2:
Prior to testing any RADAR system, the operator should first:
Assure no personnel are in front of the antenna.
Check the system grounds.
Assure the display unit is operating normally.
Inform the airport control tower or ship’s master.
3-94O3:
In the term “ARPA RADAR,” ARPA is the acronym for which of the following?
Automatic RADAR Plotting Aid.
Automatic RADAR Positioning Angle.
American RADAR Programmers Association.
Authorized RADAR Programmer and Administrator.
3-94O4:
Which of the following is NOT a precaution that should be taken to ensure the magnetron is not weakened:
Keep the TR properly tuned.
Keep metal tools away from the magnet.
Do not subject it to excessive heat.
Do not subject it to shocks and blows.
3-94O5:
Exposure to microwave energy from RADAR or other electronics devices is limited by U.S. Health Department regulations to _______ mW/centimeter.
5.0
0.005
0.05
0.5
3-94O6:
RADAR collision avoidance systems utilize inputs from each of the following except your ship’s:
Anemometer.
Gyrocompass.
Navigation position receiver.
Speed indicator.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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