Key Topic 94: RADAR Equipment

Question 1

3-94O1: The permanent magnetic field that surrounds a traveling-wave tube (TWT) is intended to:

A. Provide a means of coupling.
B. Prevent the electron beam from spreading.
C. Prevent oscillations.
D. Prevent spurious oscillations.

Answer 1

B. Prevent the electron beam from spreading.

Question 2

3-94O2: Prior to testing any RADAR system, the operator should first:

A. Check the system grounds.
B. Assure the display unit is operating normally.
C. Inform the airport control tower or ship’s master.
D. Assure no personnel are in front of the antenna.

Answer 2

D. Assure no personnel are in front of the antenna.

Question 3

3-94O3: In the term “ARPA RADAR,” ARPA is the acronym for which of the following?

A. Automatic RADAR Plotting Aid.
B. Automatic RADAR Positioning Angle.
C. Automatic RADAR Programmers Association.
D. Automatic RADAR Programmer and Administrator.

Answer 3

A. Automatic RADAR Plotting Aid.

Question 4

3-94O4: Which of the following is NOT a precaution that should be taken to ensure the magnetron is not weakened:

A. Keep metal tools away from the magnet.
B. Do not subject it to excessive heat.
C. Keep the TR properly tuned.
D. Do not subject it to shocks and blows.

Answer 4

C. Keep the TR properly tuned.

Question 5

3-94O5: Exposure to microwave energy from RADAR or other electronics devices is limited by U.S. Health Department regulations to ____ mW/centimeter.

A. 0.005
B. 5.0
C. 0.05
D. 0.5

Answer 5

B. 5.0

Question 6

3-94O6: RADAR collision avoidance systems utilize inputs from each of the following except your ship’s:

A. Gyrocompass.
B. Navigation position receiver.
C. Anemometer.
D. Speed indicator.

Answer 6

C. Anemometer.