Key Topic 15: TR - ATR - Circulators - Directional Couplers-1 Flashcards
8-15B1: The ferrite material in a circulator is used as a(an):
A. Electric switch.
B. Saturated reactor.
C. Loading element.
D. Phase shifter.
D. Phase shifter.
8-15B2: In a circular resonant cavity with flat ends, the E-field and the H-field form with specific relationships. The:
A. E-lines are parallel to the top and bottom walls.
B. E-lines are perpendicular to the end walls.
C. H-lines are perpendicular to the side walls.
D. H-lines are circular to the end walls.
B. E-lines are perpendicular to the end walls.
8-15B3: A ferrite circulator is most commonly used in what portion of a RADAR system?
A. The antenna.
B. The modulator.
C. The duplexer.
D. The receiver.
C. The duplexer.
8-15B4: A circulator provides what function in the RF section of a RADAR system?
A. It replaces the TR cell and functions as a duplexer.
B. It cools the magnetron by forcing a flow of circulating air.
C. It permits tests to be made to the thyristors while in use.
D. It transmits antenna position to the indicator during operation.
A. It replaces the TR cell and functions as a duplexer.
8-15B5: A directional coupler has an attenuation of -30 dB. A measurement of 100 milliwatts at the coupler indicates the power of the line is:
A. 10 watts.
B. 100 watts.
C. 1,000 watts.
D. 10,000 watts.
B. 100 watts.
8-15B6: What is the purpose or function of the RADAR duplexer/circulator?
A. An electronic switch that allows the use of one antenna for both transmission and reception.
B. A couple device that is used in the transition from a rectangular waveguide to a circular waveguide.
C. A modified length of waveguide used to sample a portion of the transmitted energy for testing purposes.
D. A dual section coupling device that allows the use of a magnetron as a transmitter.
A. An electronic switch that allows the use of one antenna for both transmission and reception.
