Key Topic 43: Waveguides-2

Question 1

8-43E1: A rotary joint is used to:

A. Couple two waveguides together at right angles.
B. Act as a switch between two waveguide runs.
C. Connect a stationary waveguide to the antenna array.
D. Maintain pressurization at the end of the waveguide.

Answer 1

C. Connect a stationary waveguide to the antenna array.

Question 2

8-43E2: Resistive losses in a waveguide are very small because:

A. The inner surface of the waveguide is large.
B. The inner surface of the waveguide is small.
C. The waveguide does not require a ground connection.
D. The heat remains in the waveguide and cannot dissipate.

Answer 2

A. The inner surface of the waveguide is large.

Question 3

8-43E3: A right-angle bend in an X-band waveguide must have a radius greater than:

A. Three inches.
B. Six inches.
C. One inch.
D. Two inches.

Answer 3

D. Two inches.

Question 4

8-43E4: To insert RF energy into or extract RF energy from a waveguide, which of the following would not be used?

A. Coupling capacitance.
B. Current loop.
C. Aperture window.
D. Voltage probe.

Answer 4

A. Coupling capacitance.

Question 5

8-43E5: The following is true concerning waveguides:

A. Conduction is accomplished by the polarization of electromagnetic and electrostatic fields.
B. Ancillary deflection is employed.
C. The magnetic field is strongest at the center of the waveguide.
D. The magnetic field is strongest at the edges of the waveguide.

Answer 5

D. The magnetic field is strongest at the edges of the waveguide.

Question 6

8-43E6: At microwave frequencies, waveguides are used instead of conventional coaxial transmission lines because:

A. They are smaller and easier to handle.
B. They have considerably less loss.
C. They are lighter since they have hollow centers.
D. Moisture is never a problem with them.

Answer 6

B. They have considerably less loss.